Zoning which prohibits or heavily restricts multi-unit housing in cities, and material shortages and high prices for steel and lumber which impacts new single family homes.
That's a minor factor. It does not explain how this situation happens all over the world, even where there is no overzealous zoning or high prices of materials.
The issue is cheap credit and the lack of an LVT that would avoid all the economical and ethical issues with land ownership.
I don't know how your can say that an LVT avoids all economic and ethical issues with land ownership, that seems like a personal moral opinion. Especially since there's very few instances of an LVT on the wild. I'm sympathetic to Georgism, but you're making a very powerful and unsubstantiated claim.
You're right, I didn't mean "all", I meant "some".
I don't think it's a panacea at all, I just think it would be the most effect with the smallest disruption (in that it's simply a reform to be done inside the framework of free market, private property, etc).
The issue is cheap credit and the lack of an LVT that would avoid all the economical and ethical issues with land ownership.