no plan just thought, I read some of the acts don't remember the numbers or names.
construction and architect design expected as all world I think now, the procedure rulls and how it applied from officers and official technician and engineers is the large question!
I came across incident at construction site not by owner but by mass constructor were the official tech officer rejected a handy method of construction, asking for heavy machinery method which is expensive for such small area.
as I have some experience at my country were the handy method is the major method, I was surprized, because if the procedure insist on the heavy machinery as the only construction method, it means the small and owner building houses will not be affordable.
this means the regulation is preventing the small construction.
many engineer friends at high temperature countries said there is no technical reason to prevent the handy low cost construction method for small areas like small houses, it has the same machinery efficiency if applied correctly with proper tools.

constructing 1000 sq F house  will be doubled if used heavy machinery instead of handy construction method, the  regulation orientation to encourage one and restrict other is economical not technical.