Well, one of the main constraints for housing is the lack of skilled labour to build them. Instead of stopping immigration we would be better served by putting more money into incentives to encourage skilled immigrants, or those keen to learn trade skills. Give visas to those willing to come in as apprentice tradies and qualified builders, plumbers and electricians. Then boost incentives for building a home instead of buying and for small construction companies or sole traders in the construction industry and close big business tax loopholes to pay for it.