ABSTRACT
The main aim of this research work is to compare the factors affecting cost of industrialized building and conventional building system in Nigeria. The research method used in collecting data was through the use of questionnaire administered to construction professionals in Nigerian construction industry. Seventy questionnaires were administered and fifty five were returned with response rate of 73%. The instrument used in analyzing data collected was relative importance index (RI!) to rank the factors affecting the two systems in Nigeria. From the analysis it was discovered that the major factors affecting cost of industrialized building and conventional building system in Nigeria were unstable government policy, inadequate manufacturing facilities, high cost of overhead, availability of expertise, scope of work, suitable construction environment, bureaucracy, materials waste, high cost of construction, availability of land with relative importance index of 0.82, 0.8, 0.79, 0.78, 0.77, 0.76 respectively. It was recommended that government should help in reducing the cost of building components, materials, plants and equipment and they should also set an example of patronizing the industrialized building system just as conventional building system and they should not be too strict in policy making. In conclusion the major factors affecting cost of industrialized building and conventional building system in Nigeria were unstable government policy, inadequate manufacturing facilities, high cost of overhead, availability of expertise, scope of work, suitable construction environment, high cost of construction, availability of land respectively.
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