The point is that housing would be cheaper, not that it would become dirt cheap.

There are some inherent costs to new housing. Work of professionals involved, cost of materials, compliance with all technical regulations, some profit for the developer, connection to infrastructure. Let us mark this unavoidable cost by C. It is a component of the current prices.

Then there is the component N, which is deadweight cost caused by zoning and non-technical regulations. I am not saying that it should be 0, but it is in our interest that it is kept in check, maybe 20 per cent of C. As of now, in some places, it well may be 120 per cent of C, even though it is really hard to calculate.

This component of the final price directly enriches no one, it is pure friction caused by special interests of various parties that don't want to see any new housing either near them, or anywhere (landlord cartels that hate competition - indirect enrichment).

Even C is now a formidable figure. Modern homes are basically industrial robots, they are much more complicated from the inside than they were 100 years ago. But there isn't really a reason why they should be horribly expensive.

If as a regular office person you can buy a home for, say, 5x your annual income, it is not unaffordable. That is well, just normal. Not completely everyone is expected to own their home.

The problem is that nowadays, the multiplier in many places isn't 5x, but 10x or 12x. That is just way too much. And given that C cannot be easily massively reduced (unless some sort of massive robotization of construction work happens), you really need to attack N.