Building codes are much more than you think. At least in Europe there are codes for accessibility, dwelling design, room height, utility rooms, mechanical resis

Building codes are much more than you think. At least in Europe there are codes for accessibility, dwelling design, room height, utility rooms, mechanical resistance, stability, hygiene, environment, noise levels, general safety, energy management, sewage, power, even bathrooms must be done by certified people. All those above are just few and general top-hierarchy of a forest of rules. Yes, those are all important and good for you, BUT all that add up to the cost for the actual build. The land itself that is to be developed has to go through a long line of expensive processes, tests and certifications. Investigations to ensure that there is no disturbing bird nesting areas, or too close to small streams that may have rare species. Again, all that is good, but cost and will drive up the price of the final product. I've a relative in construction, and he notes that margins are so small it doesn't make much sense for all that effort when there are other options.