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Time-cost model for building projects in Nigeria


  • D. R. Ogunsemi
  • G. O. Jagboro


The concept of project duration is important in assessing the success or viability of a construction project. A time-cost relationship for construction projects in Nigeria has been developed based on Bromilow's time-cost model. Cost data on 87 completed building projects executed within the period 1991-2000 were obtained. The data were subjected to regression analyses using double log and later the piecewise model with breakpoint. For the Nigerian situation, the Bromilow's time-cost model was found to be T = 63C0.262 with poor predictive abilities (R = 0.453, R2 = 0.205). An improved model using piecewise model with good predictive abilities (R = 0.875, R2 = 0.765) was found to be T = 118.563-0.401C (C ≤ 408) or 603.427 + 0.610C (C>408). The model is shown to be useful in predicting construction project durations.

Suggested Citation

  • D. R. Ogunsemi & G. O. Jagboro, 2006. "Time-cost model for building projects in Nigeria," Construction Management and Economics, Taylor & Francis Journals, vol. 24(3), pages 253-258.
  • Handle: RePEc:taf:conmgt:v:24:y:2006:i:3:p:253-258
    DOI: 10.1080/01446190500521041

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    References listed on IDEAS

    1. Albert Chan, 1999. "Modelling building durations in Hong Kong," Construction Management and Economics, Taylor & Francis Journals, vol. 17(2), pages 189-196.
    2. Daniel Chan & Mohan Kumaraswamy, 1999. "Modelling and predicting construction durations in Hong Kong public housing," Construction Management and Economics, Taylor & Francis Journals, vol. 17(3), pages 351-362.
    3. S. Thomas Ng & Michael Mak & R. Martin Skitmore & Ka Chi Lam & Mark Varnam, 2001. "The predictive ability of Bromilow's time-cost model," Construction Management and Economics, Taylor & Francis Journals, vol. 19(2), pages 165-173.
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    Project management; cost; time; cost modelling; Nigeria;


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