ASSESSMENT TECHNIQUES FOR SUCCESSIVE DELIVERY OF INTERNAL ELECTRICAL BUILDING SERVICE IN ABUJA, NIGERIA

Abstract

Architectural drawings for residential buildings such as those of bungalows and duplexes are not usually accompanied with its corresponding detailed electrical drawings which have led cost engineers such as quantity surveyors/estimators to find a way of determining the cost of electrical services through the use of provisional sums which is more of a guess work. The study developed a cost model in determining cost impact of electrical services in residential buildings in Abuja. Quantitative research techniques were adopted. The study made use of architectural and electrical drawings which involved the generation of the priced bill of quantities from 33 drawings (architectural and electrical), current market prices and site-observed productivity constants for the development of the cost model for electrical installation cost for residential buildings. The findings show the coefficient of determination R2 is 0.172; this shows that the equation is statistically insignificant and so therefore the gross floor area should not be used to estimate the final sub-circuits cost of residential electrical installations work. The findings recommends that floor area is not a good cost predictor of final sub-circuit cost and should therefore not be used in estimating for residential electrical installation costing.