Earlier quoted context omitted.
Which regulations would you relax? Surely there is some unnecessary red tape, but it's not as if building regulations have been developed for fun, it's largely in response to safety issues and so on.
Quite a lot of regulations have nothing to do with safety. Minimum set-backs, minimum parking requirements, maximum building heights, etc. All of these add cost and reduce density. Single-family zoning is another local government policy that is absolutely intended to constrain development, not improve safety.
I am in favor of finding ways to encourage more housing, but what you're calling for is essentially to invite favela housing in the developed world.