Housing is all messed up because land is a limited resource and regulation artificially limits it even further.

I live in a high demand area. A perfectly cromulent house on a particularly good lot will sell for $1.5 million as a teardown. The new house will be 6,000+ sqft and be inhabited by a family of four. Builders won’t build smaller because the land price sets a hard floor. The most profitable and economically productive thing would be to split the lot and build several smaller houses, or build a small apartment building, housing several times more people for the same cost. But this isn’t legal. Construction costs don’t make a difference. If construction costs doubled, the new houses would just get smaller. Some of these teardowns would stop being torn down. The cost of living in the area would stay about the same.