The shallow depth of a post-tensioned floor is a particular advantage in multi storey buildings; in some cases it has been possible to add an extra floor where there was a restriction on building height" Even where there is no such restriction, the reduced building volume generates savings in the cost of services
and cladding, and in subsequent running and maintenance costs. The reduction in the weight of the building generates further savings in the cost of foundations; the weight of concrete in floors in a multistorey building may be as much as half of the total weight of the building. The cost per unit area of a post-tensioned floor, considered in isolation, may be higher than that of a reinforced floor of the same span and carrying the same load~ but it is quite possible for the building with post-tensioned floors to prove the more cost effective when the other savings are taken into account.