Comment Re:It doesn't work (Score 1) 119
Anyone who's watched a house go up has marveled at how quickly the framing goes up, then how long it takes everything else to get done.
Framing is about 1/l4 of the build time for a house. The *labor* for framing is less than 10% of the build cost. If the machine cost *nothing*, and framed the building *instantaneously*, those are hard limits on how much faster and cheaper the house building robot could make the process: about 25% faster with about a 10% cost reduction. But the machine wouldn't work instantaneously, nor would it be free.
There already is a better way of doing this. You prefabricate the house in units, ship them to the site, then bolt the units together. The modules could be completely finished at the factory. Savings over traditional construction would be substantial -- 40%. The problem is, can you build houses people want to buy and which local building codes will allow you to live in. If you throw out expectations that a house looks like a house a child would draw with crayons, you can build a really nice. So with prefab houses you either have things that look like mobile homes; or things that look like they were designed by a scandanavian architect. Houses that *look* like mid-range, hand-built homes are a tough nut to crack.
There was a movement among architects to use pre-fabricated construction to solve the problem of housing returning GIs after WW2. It didn't catch on as the kind of democratizing mass produced housing the movement envisioned because people wanted a house that looked hand-built. But if you can get over that, it produced some really great houses. One of the more famous examples (although not completely pre-fabricated) is the Eames House. There's a company from that period that's still in business, but they pre-fabricate million dollar luxury homes, not mass produced housing.
The obstacles to prefabricated houses are regulatory, which is why it can't reach the middle of the market. Anti-mobile home rule discourage really cheap pre-fabricated houses, but high end producers can afford to jump through the regulatory hoops. For mid-range houses, the regulatory burden outweighs the economic advantage of prefabrication. This could allow a framing robot to have a niche, although as I pointed out it won't save much money on the build cost.