Risk Factors That Lead to Time and Cost Overruns of Building Projects in Saudi Arabia

: Rapid transformation across all sectors through Saudi Arabia’s vision 2030 initiatives led to an increase in construction activities. However, the construction industry has been already facing huge cost and time overruns, affecting all stakeholders. The aim of this study is to identify and explore the inﬂuential risk factors that lead to completion delays and cost overruns of government-funded building construction projects in Saudi Arabia, all of which have been subjected to a traditional type of procurement method (Standard Public Works Contract). The literature examined in this study identiﬁed a total of 83 risk factors, which have been grouped into nine categories. A questionnaire-based survey was conducted to determine the participants’ perspectives on the degree of probability of occurrence ( P ) of each risk and its potential impact on a project in terms of time ( IT ) and cost ( IC ). The questionnaire survey was distributed to 200 experts and professionals associated with Saudi building construction projects, which were grouped into four categories: clients, designers, consultants, and contractors. Fifty-ﬁve acceptable questionnaires were returned and analysed. The relative importance index ( RII ), and Risk Importance ( RI ) were used to identify the most inﬂuential risk factors, and an agreement test was conducted. The results of the survey revealed that the most signiﬁcant risks factors contributing to the delay of building construction projects’ completion are contractor’s ﬁnancial difﬁculties, owner’s delay in making progress payments for completed works, contracts awarded to the lowest bidder, change orders during construction, ineffective project planning and scheduling by the contractor, shortage of manpower, and contractor’s poor site management and supervision. In addition, change orders during construction and contracts awarded to the lowest bidder are the most signiﬁcant risks factors of exceeding budgets. Based on the results, it is concluded that for achieving sustainable development, client, contractor, and labour-related risks must be effectively managed.


Introduction
The main evaluation dimension of the successful execution of construction projects is to examine the achievement of project objectives (time, cost, and quality) [1][2][3].Previous research has elicited that construction projects experience underachievement in both developed and developing countries as a result of completion delays and cost-overruns, with resultant negative impacts experienced by all involved parties, including financial loss [4][5][6].
Project delay has been defined as 'the time overrun either beyond the completion date specified in the contract and the parties agreed upon for the delivery of the project, or a part of the project' [7,8].The liability of the contract parties for construction projects delays can be classified into excusable with compensation delays, excusable without compensation delays, non-excusable delays or contractor responsible, and concurrent delays [9,10].Construction cost overruns is the actual/final costs minus those estimated, presented as a percentage of the estimated costs [11].

1.
To explore and identify the influential risk factors leading to duration and cost overrun during the construction stage, with special consideration for building projects in Saudi Arabia (i.e., risk factors list and classification) through the completion of a comprehensive literature review.2.
To study, rank, and analyse the identified risk factors (i.e., 'risk impact × likelihood') by conducting questionnaires.
Addressing the RQ and the above-listed objectives could achieve interesting findings which can contribute to the literature in providing the risk factors by project type, i.e., government-funded building construction projects.It can also help decision makers in better understanding the risks in construction industry during COVID-19 in order to better formulate policies and decision making with respect to Vision 2030 objectives.Furthermore, the findings can aid the managers of building construction projects in designing effective risk management strategies.

Literature Review 2.1. Overview of Construction Industry
Construction, in simple terms, is the process of constructing an infrastructure that requires collaboration of multiple disciplines, including architectural design management, financial and legal management, engineering and technology, logistics and procurement, sustainability, risk management, project management, etc. Types of construction can be broadly classified into industry-specific, building, and residential constructions [23].The construction industry is considered to be one of the sustainable and continuous businesses that has been recording steady growth in recent decades.However, there are various risk factors that influence this industry, such as geopolitics, economy, resources, technology, etc.The global construction output growth in 2019 reduced to 2.7%, which was less than 2018, and such deterioration was observed in many developing countries, especially the Middle East, while developed countries, such as the USA and Australia, have struggled to maintain growth momentum [24].
Various findings have been identified in different studies [25][26][27][28], reflecting the complexity and different influencing factors in the construction industry.It has been estimated that there will be 85% growth (USD 15.5 trillion) in construction output by 2030 (3.9% growth per annuum), out of which 57% of growth was contributed by a developed country, the US, and developing countries including India and China [26].Faster growth is predicted in the USA (5% per annuum) compared to China, followed by India and Japan.In a report by Robinson [27], the construction market is predicted to grow by USD 8 trillion by 2030.A KPMG [25] survey revealed that only 20% of the global constructive companies were innovative, 60% were followers, and 20% were behind the curve.In addition, disparities were observed in strategies, practices, and performance of the companies', reflecting gaps in the process.Deloitte identified seven factors that can have an impact on growth in construction industry, including the following: innovation, competitive dynamics and margin improvement; internationalism, compliance, regulation, and transparency; and sustainability [28].The findings from these studies indicate the complexity in construction industries, with there being various influencing factors, including geopolitics, environmental, technology, strategies, innovation, etc.Furthermore, the COVID-19 impact has significantly affected the construction industry, with many companies facing liquidity problems.Reduced spending and consumption capacity, operating restrictions and fear of contagion, supply chain disruptions, and lack of labour have all contributed to the impact, which have affected the sustainability of many SMEs across the globe [29].A recent report on the construction industry predicted that smaller businesses and sub-contractors may fail rapidly; contract management can be a major issue as customers may seek to terminate or renegotiate contracts; internationalisation may become less viable as companies may reconsider the regions in which they want to operate in [30].

Saudi Arabian Construction Industry
Saudi Arabia's construction industry was severely affected during 2015-2016 following the crash in oil prices, which reduced the capital flow; as a result, many projects were halted, postponed, or even cancelled.However, the construction industry in the country is expected to grow exponentially in the next few years, with it gearing up towards a post-oil era, when new major cities will be developed and constructed [31].According to a report published by Mordor Intelligence [31], more than 5200 construction projects are currently ongoing in Saudi Arabia, valued at USD 819 billion, out of which 3727 are urban construction active projects, and these are valued at USD 386.4 billion.There 733 are utility sector projects valued at USD 95.6 billion and 500 relating to transportation, valued at USD 156.2 billion.The Saudi construction industry is highly competitive with major international players [32].The market presents opportunities of growth, which is expected to increase the market competition further.However, with a few players holding a significant market share, the Saudi Arabian construction market has an observable level of consolidation [33].Focusing on the type of construction, Saudi Arabia spent USD 575 billion on public construction projects between the years of 2008 and 2013 [34,35].A recent report [36] has forecasted a growth of 2.9% in 2021 in the Saudi Arabian construction industry and CAGR of 4% during 2022-2025.Furthermore, a Public Investment Fund (PIF) of USD 800 billion was underlined by the Crown Prince for funding projects over the next decade.Moreover, year-on-year growth of construction contract awards in Saudi Arabia are forecasted to reach 96 percent in 2022, which is diversified over different types of projects [37].For instance, the total value of planned building contract awards alone in the Saudi Arabia is predicted to be USD 10.95 billion in 2022 [38].Given these forecasts, the construction industry will be growing rapidly in the next few years.
The Saudi Arabian construction market is expected to witness significant growth and offer lucrative potential, due to its Vision 2030, NTP (National Transformation Programme) 2020, and several ongoing reforms aimed at diversifying away from oil.The Vision 2030, NTP 2020, and private sector investment boost as well as the ongoing reforms are likely to be the growth drivers for the Saudi construction market in 2018 and beyond.Vision 2030, along with a significant investment in housing and infrastructure development promoted across the country by local authorities, is revitalizing the construction industry and generating interest in a growing number of international players.Due to these programmes, the construction industry might have access to various opportunities; however, there are challenges associated with these programmes.Changes in regulations, policies, and the granting of planning approval may create complexity in the commencement of new projects and the completion of those already in progress, as they will have to be modified according to these new regulations.In this context, it is worth noting that the Saudi contractors' classification system functions within five grades according to the value they hold for a contract to be signed and 29 fields.The Example of the fields as following: buildings, roads, industrial works, marine works, dams, electrical works, and mechanical works [39].In addition, according to the Government Tenders and Procurement Law in Saudi Arabia, all government bodies and agencies must use Saudi Arabia's Public Works Contract (SPWC) for all government-funded public construction projects.In addition, an increase in the projects will require growth in the work force, as a result of which companies may well have to depend on expatriates, which might result in acquiring an unskilled workforce lacking experience and facing issues in regard to cultural integration.In addition, without proper estimations of costs and risks, the contractors may end up suffering from financial losses.

Risk Factors Leading to Cost and Time Overruns
Studies have identified various critical success factors for construction projects.These included time, cost, quality, safety, client's satisfaction, employees' satisfaction, cash-flow management, profitability, environment performance, learning and development, etc. [40].However, the majority of the past research have extensively focused on the three major factors for success in construction industry, which included cost, time, and quality [41].It has been elicited that over 70% of public construction projects in Saudi Arabia have experience delays [42].Various risk factors and challenges explaining the time and cost overruns for these projects have been uncovered.Baghdadi and Kishk [43] identified 54 risk factors in the context of external, internal, and force majeure in aviation construction projects, which were causing duration delays as well as cost overruns.Mahamid [44], focusing on the factors affecting performance in construction projects, identified various risks, including poor communication among project participants, poor labour productivity, poor planning and scheduling, payment delays, escalation of material prices, poor labour productivity, and poor site management.Regarding the causes of disputes, Mahamid [44] identified 29 direct and 32 indirect dispute causes, of which major direct dispute causes included delay in progress payment by the owner, unrealistic contract duration times, change orders, poor quality of completed work, and labour inefficiencies.Major indirect dispute causes included inadequate contractor experience, lack of communication between the construction parties, ineffective planning and scheduling of the project by the contractor, cash problems during construction, and poor estimation practices.
Focusing on the design risks, Sha'ar et al. [45] identified unstable client requirements, lack of proper coordination between the various disciplines of the design team, awarding the contract to the lowest price regardless of the quality of services, lack of skilled and experienced human resources in the design firms, lack of skilled human resources at the construction site, delaying of due payments, lack of a specialised quality-control team, lack of professional construction management, delaying the approval of completed tasks, and deficient drawings and specifications.Various other challenges, such as those related to subcontractors, labour, machinery, availability of materials, and quality; and client-related risks such as financial issues, issues related to design documents, change in codes and regulations, scope of work, accidents on site, lack of expertise, re-designing, unqualified workforce, organisational culture, and poor contract management were identified from various studies conducted on Saudi Arabian construction industry [46][47][48].
Furthermore, the causes of the cost and time overruns factors differ between various projects/buildings.For instance, when comparing the delay factors between road infrastructure and building projects, a recent study [49] found that the major critical delay factors for road infrastructure projects included inadequate contractor experience and payment delays to the contractor, while the shortage of materials and financial difficulties of contractor were most salient for building projects.For tall building projects, the major causes of delay and cost overruns identified in [50] included "client's cash flow problems/delays in contractor's payment", "contractor's financial difficulties", and "poor site organization and coordination between various parties".Another study focusing on regular manufacturing and building construction [17] identified delays in progress payments, difficulties in financing the project by contractor/manufacturer, slowness in decision making, late procurement of materials, and delay in approving design documents as the major causes of cost and time overruns.In specialised construction projects, such as railways, the causes were found to be related to "Client's decision-making process and changes in control procedures", "Design errors (including ambiguities and discrepancies of details/specifications)", "Labor skills level", "Design changes by client or consultant", and "Issues regarding permissions/approvals from other stakeholders" [51].In addition, Allahaim [14] emphasised causes and classifications as differing by project type and stakeholder, with overall cost overrun depending on the type of project: power and health projects (60% cost overruns), transport and water projects (40% cost overruns), and education projects (30% cost overruns).Aljohani et al. [52] carried out a review of the literature and identified 173 causes of cost overrun in seventeen contexts, with the main ones being frequent design change, contractors' financing, payment delay for completed work, lack of contractor experience, poor cost estimation, poor tendering documentation, and poor materials management.The authors concluded that the main causes differed from country to country, and that it would be an inaccurate method to use only the global literature to identify the causes for a specific country [14].In contrast, Ahady et al. [53] found that most of causes of cost overruns in construction industries of development countries are similar, and the causes are different for every project.The most significant causes of cost overruns were fluctuations and increases in material price.Appendix A shows that various risk factors associated with construction projects from 17 studies [2,4,14,17,44,51,52,[52][53][54][55][56][57][58][59][60][61][62][63][64][65].
Hence, the factors causing cost and time overruns may change by the types of construction projects.Therefore, there is a need to focus the research on specific building projects in the context of Saudi Arabia.Furthermore, most studies in the literature probed the causes of either cost or time overruns for the construction industry, but very few considered both.Given these gaps, it is essential that risk factors and risk management techniques in Saudi Arabia have to be studied from time to time in order to prevent any damage/losses and avoid cost and duration overruns in construction projects.Accordingly, the purpose of this study is to identify the influential risk factors that lead to completion delays and cost overruns of government-funded building construction projects in Saudi Arabia, all of which have been subjected to a traditional type of procurement method Standard Public Works Contract (SPWC).

Research Methodology
For this study, the researchers adopted a cross-sectional questionnaire-based survey to identify risk factors related to government-funded building construction projects in Saudi Arabia.Figure 1 illustrates the adapted research methodology phases used to achieve the study objectives.This methodology includes four phases: the identification of initial risk factors from the literature, questionnaire design, data collection, and then data analysis.initial risk factors from the literature, questionnaire design, data collection, and then data analysis.The first phase was the identification of initial risk factors from previous literature.A comprehensive literature review was carried out to uncover the various risk factors associated with construction projects.Then, the researchers identified the risk factors that were applicable in the context of Saudi Arabia.A final list of 83 risk factors, classified into nine different groups (client-related, designer-related, consultant-related, contractor-related, labour-related, material-related, equipment-related, external risks, and force majeure), was identified to be relevant for investigation in the context of this study, as shown in Appendix B.
The second phase was the questionnaire's design.The initial questionnaire was developed based on the findings in the previous phase.All these applicable risk factors were included in the questionnaire, which was divided into three sections.The first section of the questionnaire included the participants' demographic information, while the second focused on the level to which project delays and cost overruns affect construction projects.The third section pertained to identifying which risk factors caused project delays and cost overruns by asking three sub-questions for each risk.These included the probability of occurrence (P) in projects based on the respondents' perspective and experience, the negative impact of the risk on project's time (IT), and the negative impact of the risk on project's cost (IC).The questionnaire used a Likert scale of five ratings (1: very low; 2: low; 3: moderate; 4: high; 5: very high) and was designed in both English and Arabic to improve the participants' ease of accessibility and understandability.The researchers conducted a pilot study to validate the prepared questionnaire by distributing it to a set of experts in the construction field.The collected comments were reviewed to develop the final questionnaire.
The third phase of study was data collection.The questionnaire link was forwarded to the experts in construction industry who have been working in relevant building construction projects using various online networks.The researchers adopted snowball sampling [66], requesting the participants to forward the survey link to their colleagues and other relevant professionals.The survey was initially forwarded to 38 experts.Snowball sampling is a more conducive and practical technique for the research scope and to overcome the obstacle of the questionnaire's length, finding the target audience, and providing high-quality information.However, because of snowball sampling, 63 responses were received.After removing eight incomplete responses, the responses from 55 participants were included in the data analysis.
The fourth phase of study was the data analysis of the survey results using MS Excel.The relative importance index (RII) calculated the probability of occurrence (P) of each risk, the impact of the risk on project's time (IT), and the impact of the risk on project's cost (IC).Risk Importance (RI) was used to determine the level of importance of each identified risk associated with building construction projects by multiplying the probability and impact for each in terms of project time and cost.In addition, the reliability of factor analysis was used to measure the strength of the internal consistency of the identified risk factors, and an agreement analysis test (Cronbach's alpha) was conducted to measure the strength and direction of relationship between the parties involved in this study (client, contractor, and consultant).The first phase was the identification of initial risk factors from previous literature.A comprehensive literature review was carried out to uncover the various risk factors associated with construction projects.Then, the researchers identified the risk factors that were applicable in the context of Saudi Arabia.A final list of 83 risk factors, classified into nine different groups (client-related, designer-related, consultant-related, contractor-related, labour-related, material-related, equipment-related, external risks, and force majeure), was identified to be relevant for investigation in the context of this study, as shown in Appendix B.
The second phase was the questionnaire's design.The initial questionnaire was developed based on the findings in the previous phase.All these applicable risk factors were included in the questionnaire, which was divided into three sections.The first section of the questionnaire included the participants' demographic information, while the second focused on the level to which project delays and cost overruns affect construction projects.The third section pertained to identifying which risk factors caused project delays and cost overruns by asking three sub-questions for each risk.These included the probability of occurrence (P) in projects based on the respondents' perspective and experience, the negative impact of the risk on project's time (IT), and the negative impact of the risk on project's cost (IC).The questionnaire used a Likert scale of five ratings (1: very low; 2: low; 3: moderate; 4: high; 5: very high) and was designed in both English and Arabic to improve the participants' ease of accessibility and understandability.The researchers conducted a pilot study to validate the prepared questionnaire by distributing it to a set of experts in the construction field.The collected comments were reviewed to develop the final questionnaire.
The third phase of study was data collection.The questionnaire link was forwarded to the experts in construction industry who have been working in relevant building construction projects using various online networks.The researchers adopted snowball sampling [66], requesting the participants to forward the survey link to their colleagues and other relevant professionals.The survey was initially forwarded to 38 experts.Snowball sampling is a more conducive and practical technique for the research scope and to overcome the obstacle of the questionnaire's length, finding the target audience, and providing high-quality information.However, because of snowball sampling, 63 responses were received.After removing eight incomplete responses, the responses from 55 participants were included in the data analysis.
The fourth phase of study was the data analysis of the survey results using MS Excel.The relative importance index (RII) calculated the probability of occurrence (P) of each risk, the impact of the risk on project's time (IT), and the impact of the risk on project's cost (IC).Risk Importance (RI) was used to determine the level of importance of each identified risk associated with building construction projects by multiplying the probability and impact for each in terms of project time and cost.In addition, the reliability of factor analysis was used to measure the strength of the internal consistency of the identified risk factors, and an agreement analysis test (Cronbach's alpha) was conducted to measure the strength and direction of relationship between the parties involved in this study (client, contractor, and consultant).

Ranking of Risks
To carry out data analysis, the relative importance index (RII) for each risk was calculated by Equation (1) for the probability of occurrence (P) in projects based on the respondents' perspective and experience, and for negative impact (I) of the risk on project's time (IT) and for negative impact on project's cost (IC), using five point Likert scales: where RII-is the Relative Importance Index; W i -is the weight given to each factor by the respondents from 1, 2, 3, 4, and 5 for very low, low, moderate, high, and very high, respectively; A-is the highest weight (i.e., 5 in five-point Likert scale); N-is the total number of respondents for every variable.
To prioritise risks, the formula of Risk Importance (RI) was calculated by multiplying the probability and impact for each in terms of project time and project cost (see Equation ( 2)).Based on the calculations, risks were classified as "high", "moderate", or "low" importance.Risks that have an (RI) value equal to or greater than (0.6) were classified as "high" and were significantly important, and those between 0.6 and 0.4 were classified as "moderate" importance and less than 0.4 as "low" importance: where RI-is the Risk Importance to determine the level of importance of each identified risk; P-is the probability of risk occurrence; I-is the impact of risk on time or cost.

Reliability of Factor Analysis
For this study, Cronbach's alpha (Cα) testing was used to measure the reliability and strength of the internal consistency of the identified risk factors.The Cα range is between 0 and 1, and the acceptable reliability number is typically 0.7 or higher as identified by [67].The Cα formula for Likert scale is shown in Equation (3) below: where: Cα-is Cronbach's alpha; K-is many items; σ 2 b -is the variance of test score; σ 2 t -is the variance of item scores after weighing.

Agreement Analysis
Spearman's rank correlation coefficient (r s ) was used to measure the strength and direction of relationship between two ranked sets rather than the actual values.The coefficient was calculated by Equation (4) for ranked risk factors for pairs of the parties involved in this study (client, contractor, and consultant): where r s -is Spearman's rank correlation coefficient between two parties; d-is the difference between ranks assigned to each risk; n-is the number of pairs of rank.

Participants' Demographics
Out of 55 acceptable questionnaires, 30 respondents (54.55%) belonged to the public sector, whereas (34.55%) were from the private sector, and 5.45% belonged to semigovernment sector; the remaining 5.45% belonged to academic and research institutions.Twenty-seven respondents (49.09%) designated themselves as the client (owner/government agency), eighteen respondents (32.73%) were designers and consultants, and eight respondents (14.55%) reported to be contractors.The majority indicated that they had a masters degree (MSc) (41.82%), and 23.64% responded that they held a PhD.
Furthermore, the majority of the participants (63%) in this study had an experience of more than 15 years on construction projects, and they were distributed across various areas in the construction sector, reflecting the quality inputs gathered from the diverse experts.The quality of the responses was considered reliable for the analysis due to personal level interaction, relevant experiences, and clear understanding of the questionnaire among the participates.Table 1 summarises the first part of the questionnaire responses, including the respondents' educational background and experience.

Delay and Cost Overrun in Construction Projects
Based on reported experience, more than 40% of projects had been subject to delays in the execution phase for thirty respondents (54.55%), and the percentage of project delays was more than 30%, as identified by 25 respondents.Fifty-four respondents had experienced project cost overruns in the execution phase and the average percentages of cost overruns were between 10% and 25% for 29 respondents, whereas 25 respondents (45.45%) have experienced projects cost overruns with less than 10% of average percentage of cost overruns.Table 2, below, summarises the results of second part of the questionnaire.
However, it has been documented that over 70% of the public projects in Saudi Arabia were delayed [68].For instance, university construction projects were found to be experiencing delays from 50% to 150% [42].The findings of this study indicate slightly fewer delays (45% of participants stating delays less than 40%) compared to previous studies [69,70], which have identified them as being from 70% to 75%.

Ranking of Risks
Risks that are associated with building construction projects in Saudi Arabia were assessed and ranked in terms of project delay and project cost overruns by calculating the Relative Importance Index (RII) of the probability of occurrence (P) for each risk, RII of impact of the risk on project time (IT), and (RII) of impact of the risk on project cost (IC).Then, Risk Importance (RI) was calculated for each risk in terms of project time (delay) and project cost (cost overruns), being subsequently ranked, as shown in Table A2 (Appendix B).The top ten risk factors that led to delay and cost overruns in building construction projects are shown in Table 3.As a result of Risk Importance classification (high, moderate, and low), seven risk factors that were the most significant risks factors contributing to completion delay of building construction projects were (1) contractor's financial difficulties (RI = 0.692), (2) owner's delay in making progress payments for completed works (RI = 0.672), (3) contract awarded to lowest bidder (RI = 0.631), (4) change orders during construction (RI = 0.627), ( 5) ineffective planning and scheduling of project by contractor (RI = 0.627), ( 6) shortage of manpower (RI = 0.608), and (7) contractor's poor site management and supervision (RI = 0.601).On the other hand, there were two significant risks factors contributing to cost overruns: (1) change orders during construction (RI = 0.622) and ( 2) contract awarded to lowest bidder (RI = 0.601).The top ten risk factors that led to delay and cost overruns in building construction projects are shown in Table 3.
The most significant risks factors identified in this study are related to contractors (financial difficulties, ineffective planning and scheduling of projects, and poor site management and supervision), clients (delay in making payments, awarding contracts to the lowest bidder, and changing orders during construction), and labour (shortage of manpower).Contractors' financial difficulties (ineffective cash flow management) was ranked as the first major risk factor in this study.Shash and Qarra [71] conducted a study that revealed that 40% of contractors in Saudi Arabia experience financial failure due to poor cash flow management.Saudi contractors' classification system classifies contractors to a five-grade scale.Although these grades determine the maximum project budget size that allow contractors to bid for (an upper limit), it does not consider the maximum number of projects (the total financial limit of all awarded projects) [39].Consequently, some contractors use the cash flow of one project to finance different project deficits [71].This result is in line with some of the investigated studies [2,[71][72][73].The Saudi contractors need to adopt effective cash flow management practices that require planning, monitoring, and controlling cash inflow and outflow at both the company and project levels to achieve financial success and avoid project deficits.
The second ranked risk factor is the owners' delay in making progress payments to the contractor for completed works (payment delays).Most Saudi construction contractors suffer from progress payment delays.Although Saudi contractors receive 5.0% of the contract price at the beginning as an advance payment from the project's owner, the progress payments are the key sources of cash inflow to resolve deficit cash flow and avoid or minimise outsource finance.Delayed progress payments and high expenses of construction project leads to delaying construction work progress and increasing the project costs unless the contractor is capable financially.Approval process (65%) and bureaucracy (25%) are the primary reasons for delays in owners' progress payments [71].This result is supported by [52,60,71,74].
Contracts awarded to the lowest bidder was ranked as the third most significant risk to building construction projects in Saudi Arabia.This risk can be attributed to the government's tender and procurement system and the contractors' classification system in Saudi Arabia.This practice creates uncertainty due to a lack of experience, lack of financial capability, incompetent contractors, and suicide tendering.It is supported by studies in different contexts and was also identified by [7,60,74] in Saudi Arabia as the most important significant risk factor in Saudi Arabia.
Changing orders during construction were considered the fourth most important risk for project delay in this study.It was also identified by [7] Assaf in Saudi Arabia and by [75] in Kuwait as the most significant risk factor causing project delays.Change orders usually lead to change project schedules and contract prices, claims and disputes, and poor quality of work.Khalifa and Mahamid [20] identified the factors causing change orders in Saudi Arabia.The top causes of change orders are owners' additional work, design errors and omissions, lack of coordination, defective workmanship, owners' financial difficulties, and differing site conditions.
Ineffective project planning and scheduling by contractors was ranked as the fifth among the top risk factors in this study.It was also identified by [7,70,74] in Saudi Arabia and by [2] in Malaysia as the most important risk factor.The shortage of manpower (skilled, semi-skilled, and unskilled) was ranked the sixth major risk factor in this study, which is similar to the findings observed in [42].However, studies [68,76] identified shortage of labour as being less influential compared to the other factors among the top ten terms of risk.Disruptions in supply chain and movement of labour due to the recent COVID-19 pandemic could be one of the reasons for the higher ranking for shortage of labour.Although COVID-19 may be considered as a force majeure risk, the impact it caused may affect all three stakeholders, including clients, consultants, and contractors.Furthermore, the number of risk factors identified in Saudi Arabia in previous studies [68,76,77] was from 45 to 60, and they were mostly related to owners (clients) and contractors.Finally, contractors' poor site management and supervision was ranked as the seventh most important risk factor in this study.It was identified by [72] in Vietnam and by [2] in Malaysia.
Changing orders during construction and contracts awarded to the lowest bidder were ranked as the first and second most significant risks to construction projects in Saudi Arabia that caused project cost overruns, which were client-related risks.This result is supported by previous research conducted by [52,54].
Furthermore, from the perspective of the three groups of respondents (clients, consultants, and contractors), they indicated the risks related to their areas with low RI compared to the other groups (as shown in Table A3, Appendix B).For instance, RI for almost all the client-related risks was less than 0.6, as rated by the participants who were in this category, whereas some of these risks were rated with an that was RI more than 0.6 by consultants and contractors.However, no major differences among the groups were identified in rating the risks pertaining to designer-related, labour-related, material-related, equipment-related, and external risk factors.Table A3 (Appendix B) presents the ranking according to the perspectives of the three groups of respondents.
Among the identified risk groups, contractor-related risks were identified to be the major risk factors causing both time and cost overruns.Considering the remaining categories, materials-related, labour-related, consultant-related, and external risks had greater impact on cost overruns; materials-related, force-majeure, and consultant-related risks had greater impact of time overruns.The findings clearly indicated the disruptions in supply chain, which may be attributed to the recent pandemic and issues in planning and implementation.
In addition, analysing the risks of each group in order to identify the most important group of risk in building projects in Saudi Arabia, as shown below in Table 4.The results revealed four groups as the most important groups with score more than 0.45, which include client-related risks, contractor-related risks, labour-related risks, and design-related risks, all of which were found to have a greater impact on both cost and time overruns.Client-related risks were ranked highest in government-funded projects.However, this finding contrasts with some studies on Saudi Arabian construction where contractor-related risks were given the highest importance [69,74], while in [22] clientrelated risks were identified as being in this place.Contractor-related risks have been elicited as being the second most important risk in this study, which contrasts with its rankings in other studies [69,70,74]; however, it was identified as being one of the most significant risks in [43].Moreover, labour-and design-related risks were identified as being significant in studies [43,78] conducted in Saudi Arabia, while other studies [69,70,74] did not find this to be the case.
The risk factors identified in this study, although they reflected similar risks identified in other recent studies in different project types in Saudi Arabia, had few differences identified in terms of the nature of significant risks and their priority.For instance, in the study focusing on the oil and gas industry [15], client-related risks included changes in design and contractor-related risk, and poor planning and implementation were identified as the significant risks; On the other hand, in the study focusing on manufacturing and building projects [17], contractor-related risks including financial difficulties and delays in procurement of raw-materials were identified to be significant risks.In another project related to roads construction, poor planning and poor labour productivity and unskilled labour were identified to be the significant risks.Lean practices can be an effective approach in this context for improving the planning and implementation of construction projects in Saudi Arabia, as it can result in social, economic, and environmental benefits [79].Although lean practices were identified to be effective in different countries [79,80], different barriers such as traditional practices, client related, technological, performance and knowledge, and costrelated barriers were identified, which limit the implementation of lean practices in Saudi Arabia [81].Therefore, there is a need to address these barriers for effective implementation of lean practices for addressing the various types of risks in Saudi Arabian construction industries.It is evident from these studies that the nature of risks and its significance may change with the types of projects and countries; therefore, risk management strategies and approaches have to be adjusted accordingly.
These research findings provide a good lesson to not only Saudi Arabia but also the construction industries in other countries, especially the Middle East countries, where there is a lack of skilled resources, high dependency on expatriates, and rising demand for new construction projects.Furthermore, the findings in this study contrasted with studies conducted in other developing countries.For instance, in Malaysia [2,61], design and contract risks were identified to be of high priority, followed by labour risks.However, with increase in FDIs, the clients of the governments may require different changes or raise issues in agreements that may lead to an increase in such risks, as identified in this study in Saudi Arabia, which is focusing on acquiring huge FDIs.Similar results may be identified in China [59], where client risks and contractor-related risks were identified to be the significant risks.Therefore, for developing countries looking for FDIs in the construction industry, client-related risks may emerge as top risks in the near future.While other risks such as material and labour-related risks would be commonly identified in developing countries with limited technical and human resources [55].

Reliability of Factor Analysis
It was calculated for the nine groups and the overall factors, as shown in Table 3.The results of Cronbach's alpha were all more than 0.8, thus indicating an acceptable level of reliability was achieved, as shown in Table 5.

Agreement Analysis
As shown in Table 6, the results indicate positive agreement between the pairs of parties, with the highest level being between the client and consultant, at 82.8%, and 73.8% agreement between the consultant and contractor, and then 64.1% agreement between the client and contractor.The lowest degree of agreement appears to between client and contractor (43.3% with impact on project cost overruns and 34.1% with risk importance of cost overrun).The overall agreements between the parties in ranking the risk factors and other major findings in this study can be used for further research and analysis.Regarding the level of agreement amongst the different stakeholders, it is evident from Table 6 that client-consultant had the highest, while client-contractor had average levels of agreement, thus indicating the major issues relating to the clients-contractors' relationships and transactions.The low probability in client and contractor relationship can be understood in different perspectives and interests.The relationship between client and contractor can be influenced by various factors.For instance, commitments from the contractors and competence trust of the clients are very volatile, which can significantly affect the relationship between them [82].While time, cost, and quality were considered as important client values, they were not considered as exclusive values for assessing contractors service, indicating the differences in the values, attitudes of both parties, and the relationships between them [83].The major issues identified in this study and previous ones [68,76,77] have revealed that the majority of the risk factors of high priority pertain to client-contractor relationships.Hence, it can be concluded that the companies and consultants in Saudi Arabian construction industry should focus on improving the client/contractors' relationships, the tendering process, project planning and execution, and financing.

Conclusions
The construction industry in Saudi Arabia has suffered from completion delays and cost overruns, which have caused financial losses for all parties involved in such a competitive environment.The survey results revealed the seven risk factors that were the most significant risk factors contributing to the completion delays of building construction projects out of the eighty-three risk factors identified from literature review.These risk factors included contractors' financial difficulties, owners' delay in making progress payments for completed works, contracts awarded to the lowest bidder, change orders during construction, ineffective project planning and scheduling by contractor, shortage of manpower, and contractors' poor site management and supervision.Additionally, changing orders during construction and contracts awarded to the lowest bidder were the most significant risks that caused projects cost overrun, which were client-related risks.It revealed four risk groups as the most significant: client-related risks, contractor-related risks, labour-related risks, and design-related risks.Each group was found to have a notable impact on both cost and time overruns.The statistical analyses revealed an acceptable level of reliability of the identified risk factors and a positive agreement between the clients, consultants, and contractors.
The findings have revealed issues in the client/contractor relationship and tender allocation process, which may help industry experts and government agencies in future plans to mitigate the risks identified in this study.Furthermore, with uncertainty continuing due to the COVID-19 pandemic and the opening of the markets, future studies could focus on investigating the force majeure risks and the impact these have on the relationships between the stakeholders and supply chain systems in the Saudi Arabian construction industry.To achieve sustainable development, client-, contractor-, and labour-related risks must be effectively managed.
The novelty of contributions in this study can be reflected in the findings achieved in specific to government funded building construction projects in Saudi Arabia, which previous studies have not focused, although the difference in the risk factors with project types were highlighted in previous studies.Furthermore, the findings of this study are novel, due to the situations created by external factors such as COVID-19 pandemic, which has greatly affected resource management and continuity in construction.However, there are certain limitations that can be observed in this study.This study adapted snowball sampling methods and only considered government-funded building construction projects through SPWC processes, while there are also other project types.These limitations can be addressed in future research works.Future research can focus on another project types in the context of Saudi Arabia, such as roads, industrial projects, etc.However, various implications can be drawn from the findings in this study.Firstly, the results from this study aids decision makers to better understand the impact of the COVID-19 pandemic on the construction industry, based on which necessary policy-related decisions may be taken to strengthen the construction industry and better implement vision 2030 objectives.Secondly, the findings in this study contribute to the literature on the risk factors by project types, as this study focused only on government-aided building construction projects.

Table 2 .
Performance of building construction projects.

Table 3 .
Top 10 Risk factors that lead to delay and cost overruns in building construction projects.

Table 4 .
The most important group of risk factors.

Table 5 .
Reliability analysis (Cronbach's alpha) for the risk factors.

Table A3 .
Risk Importance (RI) for risk factors of building construction projects and ranking, according to the perspective of the three groups of respondents.