[bluGill]

Building is - or should be - iterative. However each building is a separate iteration. Once you are done you stop and look at what works and what doesn't, then adjust the next one. The more you make your building different/unique from what everyone else around you is doing the more expensive it will be as nobody knows what changes really work - and even if they are for the better the lack of experience means you are paying extra for the laborers to figure out how to do things.