I think the problem is less about zoning and due more to the number of people around who can build houses. Everyone went off to college to be a white collar worker and there just isn't a lot of plumbers and electricians per capita anymore. And that's not easy to fix. You can't even import these sort of people because of licensing, bonding, insurance, etc regulations that exist on these blue collar workers now. It's an uphill battle trying to change any of those regulations too, because insurance companies will fight you.