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Comparative Cost Analysis of using Conventional Blocks and Interlocking Bricks for Mass Housing in Nigeria

House is the third topmost need of individuals next to food and clothing. The production of this essential human shelter is in deficit in Nigeria. The managing director of the Federal Mortgage Bank of Nigeria (FMBN) reported recently that the housing deficit in Nigeria is 22 million units. Despite numerous government policies and housing reform programmes, housing remains an illusion to an average Nigerian. The solution to this generic problem is a production of mass housing through the use of affordable local materials and interlocking brick is one of such materials. The study compared the cost of producing mass housing using conventional (sandcrete) blocks and interlocking bricks as walling material. A prototype building plan of a threebedroom apartment was used for the analysis using percentile. Historical costs data were collected from specialist interlocking bricks manufacturer while costs data on conventional blocks and labour were collected through a market survey. The result also indicates that the labour cost for the conventional block was ₦1,025.64/m while the labour cost for the interlocking block was ₦1,709.40/m. The overall cost for the conventional block was ₦17,782.19/m while the overall cost for interlocking brick was ₦10, 378.06/m. This implies that there is a 58% cost saving in using interlocking bricks. The study recommended that the government should encourage the use of interlocking