I have been estimating build costs for different sized houses of identical 2 storey “standard” specification on the same plot in Leicester (East Midlands). The build cost calculator indicates that build costs per square metre increase as the size of the house increases.
Small house (less than 113 sq m GIA) = £723 psm
Medium (113 – 140 sq m) = £783 psm
Large (over 140 sq m) = £929 psm
A similar result is shown when I double checked this against building in the South East.
I was expecting economies of scale to apply resulting in a greater cost per sq m for very small houses and a significantly reduced cost per sq m for larger houses (all other things remaining equal).
Have I made a mistake somewhere?