TY - GEN
T1 - Effects of Variation on Project Cost of Selected Building Projects in Lagos State
AU - Dosumu, Oluwaseun Sunday
AU - Aigbavboa, Clinton O.
N1 - Publisher Copyright:
© ASCE.
PY - 2017
Y1 - 2017
N2 - Variation has been an immanent part of the construction industry and it plays an important role in determining the final cost of construction projects. In Nigeria, Lagos State particularly, variation occurs in large magnitude. This study investigates the effect of variation on project cost in Lagos State and then recommends control measures as provided by respondents. The study involves a preliminary study of the valuation documents of 18 building projects to extract the variation costs in them. These costs were matched with project costs to determine the percentage contribution of variation to project cost. The control measures for variation were based on interview of 35 construction experts. The data for the study was analyzed with frequencies, sums, and percentages. From the documents investigated, a total of 569 variations were identified and 42.2% of them were additional works, 53.1% were change in quality, timing, and dimensions of work and 4.7% were omission of works. The study also found that 12.5% of building projects have 1-5% variation, 43.7% of projects have 5-10% variation, 12.5% of projects have 10-15% variation and 31.3% of projects have more than 15% variation. The recommendations for controlling variations are: clients should provide clear and concise project brief, application of contract price fluctuation system, and involvement of contractors in the design process.
AB - Variation has been an immanent part of the construction industry and it plays an important role in determining the final cost of construction projects. In Nigeria, Lagos State particularly, variation occurs in large magnitude. This study investigates the effect of variation on project cost in Lagos State and then recommends control measures as provided by respondents. The study involves a preliminary study of the valuation documents of 18 building projects to extract the variation costs in them. These costs were matched with project costs to determine the percentage contribution of variation to project cost. The control measures for variation were based on interview of 35 construction experts. The data for the study was analyzed with frequencies, sums, and percentages. From the documents investigated, a total of 569 variations were identified and 42.2% of them were additional works, 53.1% were change in quality, timing, and dimensions of work and 4.7% were omission of works. The study also found that 12.5% of building projects have 1-5% variation, 43.7% of projects have 5-10% variation, 12.5% of projects have 10-15% variation and 31.3% of projects have more than 15% variation. The recommendations for controlling variations are: clients should provide clear and concise project brief, application of contract price fluctuation system, and involvement of contractors in the design process.
UR - http://www.scopus.com/inward/record.url?scp=85039918615&partnerID=8YFLogxK
U2 - 10.1061/9780784481073.005
DO - 10.1061/9780784481073.005
M3 - Conference contribution
AN - SCOPUS:85039918615
T3 - ICCREM 2017: Real Estate and Urbanization - Proceedings of the International Conference on Construction and Real Estate Management 2017
SP - 42
EP - 52
BT - ICCREM 2017
A2 - Wang, Yaowu
A2 - Pang, Yongshi
A2 - Shen, Geoffrey Q. P.
A2 - Zhu, Yimin
PB - American Society of Civil Engineers (ASCE)
T2 - 2017 International Conference on Construction and Real Estate Management: Real Estate and Urbanization, ICCREM 2017
Y2 - 10 November 2017 through 12 November 2017
ER -