Mostly because governments make it harder to build homes with zoning, fees, regulations, etc. if you get rid of all that it is surprisingly inexpensive to build a house.
Next is labor which is driven up by the requirements of licenses, unions and people needing to be paid more so they can afford homes too.
Then there is the issue that people want larger than necessary houses which massively raises the cost. Build small.
Add to that the fancy features like air conditioning, electronics, looks and such.
I built my house for $7,000. No zoning. No permits. I provided all the labor, engineering, architecture, plumbing, wiring, etc. it is small, super high thermal mass and highly insulated so it naturally stays cool in the summer and warm in the winter with burning only 0.75 cord of firewood. Ultra low maintenance.
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