If cars or appliances are built the way most houses are built now (in USA at least), manually, without precise design, from sub-optimal materials, they would cost millions of dollars, 10-100x.
Somehow, house building and repair is still done in a primitive and expensive way.
Same engineering, science and technology methods that improved countless other industries. can and will be applied for housing industry.
Now may be a good moment, with expected more efficient regulations, a big demand for affordable housing, and readily available AI tools to help with design.
A few prominent efforts, with very different designs, while similar objectives
361 sq ft, unpack in 1 h, $50K, Elon Musk lives in such house on SpaceX site in TX. 9.6' ceilings. Build in factory in Las Vegas, big ambitions and big investment.
"link all nine dots using four straight lines or fewer, without lifting the pen" (solution at the end)
GEOSHIP
Designed and engineered from the "first principles", from optimal materials and optimal shape. Dome is most efficient shape possible, maximize volume for material used, best insulation.
Geoships are made of "bioceramic." (bone-line material) Used up until recently on high-end consumer electronic products, bioceramic is an organic material that, once bonded, can withstand disasters and last 500 years unscathed —and perhaps lower construction costs at a mass scale. Their goal is to build big family domes and enduring communities