The research aims to model to predict the parametric cost estimation in construction building projects in Gaza Strip using Fuzzy logic. The building factors which effect the parametric cost estimation were surveyed. A questionnaire survey and relative index ranking technique were used to indicate the most five important factors from the view points of contractors, clients and consultants. 106 Case studies from real executed construction project in Gaza Strip were collected for the most important five factors to build up Fuzzy logic Model. The results revealed the ability of Fuzzy Model to predict cost estimate to an acceptable degree of accuracy
