D.R. Horton signs Promise Robotics for parts of 1,250-plus Arizona homes

D.R. Horton, the largest U.S. homebuilder by volume, plans to have portions of more than 1,250 homes manufactured by robots in an Arizona factory before traditional crews assemble them on site, under a multi-year agreement Promise Robotics announced Oct. 13. The work would move wall and floor framing, plus components for windows, doors and stairs, off the job site. Promise expects its Phoenix-area factory to begin manufacturing in early 2027, and the Phoenix Business Journal placed the facility in the Gilbert area.

The agreement is a large bet relative to the supplier's record. Promise, which is based in Toronto, has built 200 homes since launching, and D.R. Horton is its first major U.S. partnership, Homes.com reported. The 1,250 figure covers production over the life of the contract, not a year's output. Attar described it to HousingWire as an opening allotment that grows as the plant does: "We call that anchor volume, and then we say every six months as the factory increases its throughput, we're going to offer that to you."

For D.R. Horton, the motive is the clock. "Our improved cycle times enable us to hold less housing inventory and turn it more efficiently," chief executive Paul Romanowski said on the company's July earnings call, as quoted by Homes.com. Softer buyer demand has pushed builders into incentives that cut into margins, which makes each day saved on construction worth more.

Under Promise's Factory-as-a-Service model, as the company's announcement describes it, the builder supplies its existing home designs and Promise does the rest. Its software converts the plans into production schedules and robot instructions, runs the factory and coordinates delivery for installation. Horton gets automated capacity without building or operating a plant of its own.

The speed claims come from the company. Manufacturing the components for a standard two-story single-family home takes eight to 10 hours, followed by five to six hours of on-site assembly by a traditional crew, according to Promise co-founder Ramtin Attar in an interview with Homes.com. National builders report construction cycle times closer to four months, the outlet noted. Those figures describe the structure, not a finished house. HousingWire pointed out that any reduction in D.R. Horton's overall build time will depend on how the factory work fits with the trades and inspections that follow.

Framing is one place where the labor problem is showing up. Stepped-up federal immigration enforcement has cost builders in some markets significant numbers of available trade crews, with framing delays cascading into missed completion dates, higher carrying costs and postponed closings, HousingWire reported, citing The Builder's Daily. Promise lists labor shortages among the pressures driving builders toward factory methods, and says its platform lets them build more homes "with the workforce they have today."

The labor does not disappear so much as change employers. Promise's own crews run the factory systems, Attar told The Robot Report, and the company says its U.S. expansion will create regional manufacturing and operations jobs. Attar described the work being displaced as scattered across land managers, builders and seasonal trades: "It doesn't invest in the workforce in the same way as traditional manufacturing."

Promise is pitching the change as narrow. "We're not going to disrupt your operation. We're going to do exactly what you're doing today. We're going to just give you the capacity and give you the transparency," Attar told HousingWire. That fits D.R. Horton's structure, in which local divisions control product selection and construction. Attar said Promise works with the divisions directly rather than through corporate headquarters.

Regulation sets the outer edge. Some municipalities allow windows, plumbing or mechanical systems to be installed in the factory, while others restrict how much work can be done before components reach the site, Attar told HousingWire. Promise wants to push further regardless: it has recently begun adding HVAC and plumbing systems to its factory work, Homes.com reported, which would extend the model beyond carpentry into mechanical trades.

The risk sits mostly with Promise. Factory-built housing has a history of failure, and HousingWire cited Katerra as the most prominent case. Attar said Promise is paid frequently as projects progress and is "margin positive" on every project it produces, though HousingWire limited that claim to project-level margins. The plan depends on sharing each factory across several builders to spread fixed costs, and Attar said Promise is in talks with more builders in Arizona. He told Homes.com that from lease signing to the first panel coming off the Phoenix line takes about three months.