The important things (housing, health care, ...) have gotten more expensive.Housing cost per square foot hasn't changed significantly for most of the country overall [1]. What has changed is our demand for greater square footage. Home sizes have steadily and drastically risen.
And that relative consistency has held while the quality of the housing - better energy efficiency, safer construction, etc. - has steadily increased.
We get more quality for our money today, but we complain because our demand for greater quantity comes with a higher price tag.
[1] The situation in metro areas having extreme regulations interfering with new construction, e.g., San Francisco, differs because of the regulation that putatively protects the residents, but in fact sends costs through the roof.