Research Information System
Sixth International Conference on Construction in the 21st Century(CTIC VI), Construction Challenges in the New Decade, Kuala-Lumpur, Malaysia, 5 - 07 July 2011, pp.86-93, (Full Text)
A cost estimation model that is developed for residential buildings to be used in pre-design phase and
based on the factors that affect building cost in pre-design phase is introduced in this study. Factors affect
cost in pre-design phase and affecting ratios of these factors are determined. As using affecting ratios of
factors on cost, the conversion coefficients are determined and they are used for developing the cost
estimation model. This is a conversion model. This model is explained with a formula and its usage is
facilitated with using computer programs. It can be used in the future with using building cost index.
After cost estimation models in the pre-design phase are introduced, the developed model is compared
with other cost estimation models in the pre-design phase. The values of per m2 cost that are calculated
with new model are compared to Ministry of Public Works Method values. As Ministry of Public Works
Method is used after design phase, its values are close to the actual cost. The values of per m2 cost that are
calculated with new model are -4.6% and 5.4% different from the values of per m2 cost that are calculated
with Ministry of Public Works Method.