The walls are the least expensive part of building a house.
The land?
Permits?
Appliances?
Construction costs (labor + materials) were 61%, with interior finishes 24% of construction costs, framing 20%, and major systems 18%.
Appliances were under 2%. Margin was 10%.
https://www.nahb.org/-/media/NAHB/news-and-economics/docs/ho...