Size of building

* The larger the project ,the less costly to build as wall / floor area reduces . * Cost advantage of high-rise building may accure due to lift serving a large floor area and greater number of occupant with increase plan area . * General rule is increases in size of building will produce reductions in unit costs * Cost do not rise proportionaly with increase in plan size of a building because : - Fixed costs .i.e. temporary water supply , temporary storage of material , transport does not rise with increase size of building .