For example, the material list for a 3 bedroom house is 130k. https://www.menards.com/main/building-materials/books-buildi...
Say the land is 130k in your region. You won't find 3b houses for less than 360k. If you're looking at not so cheap builders, it will be 500k.
I think there's a revolution coming in the way we build houses, it must be - because costs are through the roof. It could be either in the form of prefabricated walls, like we have now trusses, or lego bricks like the OP, or something.