Scaling Housing Production: What the Numbers Show

By Zach Dwiel • November 18, 2024 • 10 min read

Aerial view of housing development at scale

The phrase "housing crisis" is used so frequently that it has begun to lose its precision. What the numbers actually show is a production gap of specific magnitude, created by identifiable constraints, that requires specific interventions at specific scales to close. Treating it as a vague policy problem obscures the engineering and economic specificity of what solving it would require.

The Actual Deficit: Where 3.8 Million Comes From

The 3.8 million unit figure cited in most housing policy discussions comes from a 2023 National Association of Realtors analysis that compared household formation rates with housing completions over the 2010 to 2022 period. The methodology measures the cumulative gap between how many new households formed and how many housing units were completed. It is not the number of currently homeless people, nor the number of households unable to buy their preferred housing type. It is the gap between housing supply and housing demand at the population and income distribution that actually exists.

Different research organizations produce different estimates: Freddie Mac estimated 3.8 million in 2021, Up For Growth estimated 4.3 million in 2022, the National Low Income Housing Coalition focuses on a subset of approximately 7.3 million units needed for extremely low income renters. These differences reflect methodological choices about which segments of demand to include. For the purposes of understanding what the production challenge looks like, the 3.5 to 4.3 million unit range provides a reasonable planning target.

The Production Rate Required

Closing a 3.8 million unit gap while keeping pace with ongoing household formation requires understanding how many units per year the market would need to complete. The U.S. currently forms approximately 1.2 to 1.5 million net new households annually. At current completion rates of approximately 1.4 million units per year, the country is roughly treading water - not falling further behind in most years, but not closing the existing deficit.

To close a 3.8 million unit deficit over 10 years while maintaining pace with household formation would require approximately 1.78 to 1.9 million completions annually - a 27 to 36% increase over current production rates. For context, the last time the U.S. sustained that production rate was during the mid-2000s housing boom, which was characterized by an unsustainable combination of loose lending standards and speculative demand that produced homes in locations where sustainable demand did not subsequently materialize. Producing 1.8 million units per year of homes in locations where household formation is actually occurring is a meaningfully different challenge than producing 2 million units of sprawl-driven subdivisions in Sun Belt ex-urbs.

US housing completions vs household formation chart

Where the Production Constraint Actually Lives

Achieving 1.8 million completions per year requires expanding every stage of the construction pipeline, not just the labor stage. Permit processing capacity at the municipal level is a genuine constraint in many jurisdictions - some markets have permit queues of 6 to 18 months that are longer than the actual construction time. Material supply capacity, particularly lumber and engineered lumber products, has been shown to be volatile, as the 2021 lumber price spike demonstrated. And land entitlement - the process of getting raw land approved for residential development - typically takes 3 to 7 years in high-demand coastal metros, creating a structural supply constraint that production efficiency cannot address.

Labor is the constraint where technology can have the most direct impact in the near term, because it does not require legislative action, land use reform, or commodity market changes. The Bureau of Labor Statistics projects a construction labor force participation rate that will continue declining through 2030 relative to projected demand, meaning the labor constraint is likely to tighten further absent structural changes to how construction work is performed.

What Robotic Construction Can Realistically Contribute

Robotic construction systems, scaled aggressively, could address a meaningful fraction of the labor constraint in the residential sector. To understand the scale, start from the throughput: Terran's current platform completes approximately 2 to 3 framing tasks per day per deployed robot unit, with each task representing roughly 400 square feet of structural framing. A fleet of 100 deployed robot units operating 250 days per year could support the framing component of approximately 10,000 to 15,000 homes annually.

That is a small fraction of the 1.8 million unit production target. But scale in robotics is a manufacturing problem, not a workforce development problem. Increasing from 100 to 1,000 deployed units is a matter of capital, manufacturing capacity, and field service network development - challenges that have established solutions in industrial and agricultural robotics. Going from 650 trained carpenters to 6,500 trained carpenters in five years has no established solution; it runs directly into the demographic and apprenticeship pipeline constraints that created the current shortage.

The Productivity Per Site Improvement

Beyond raw unit counts, robotic construction changes the productivity per construction site in ways that matter for how many projects a regional builder can run simultaneously. A conventional homebuilder manages schedule by stacking starts - beginning each new home before the previous one is complete, using the same crew at sequential stages across multiple sites. This works when crew availability is predictable and throughput is consistent. When labor is scarce and throughput is variable, the stacking model produces a backlog of incomplete homes at various stages, each accumulating financing costs while waiting for crew availability.

A builder using robotic framing and masonry can run more starts simultaneously because the robotic tasks do not compete for the same scarce skilled labor pool. The constraint shifts from crew availability to robot availability, which is more manageable because it is scheduled rather than labor-market-dependent. Our field data shows that builders using Terran across multiple simultaneous projects reduce their work-in-progress cycle time by 22 to 31% compared to their pre-Terran operations, as discussed in our article on how autonomous robots address the housing crisis.

The Market Structure Problem

Housing production at the scale required to close the national deficit requires the right market structure, not just the right technology. The U.S. homebuilding market is fragmented: the top 10 homebuilders account for approximately 30% of single-family completions, with the remaining 70% produced by thousands of smaller regional and local builders who lack the capital to invest in robotics and the volume to amortize that investment efficiently.

This market structure suggests that robotic construction will scale most quickly through a deployment model rather than a sale model - builders renting or contracting robot deployment services rather than purchasing robot systems outright. This is Terran's commercial model. It removes the capital barrier for smaller builders and aligns the cost structure of the service with the variable nature of construction volume. A builder who starts 20 homes in a peak year and 8 in a slow year can scale their robot deployment accordingly rather than servicing a fixed capital investment through the cycle.

The Timeline Constraint

The 3.8 million unit deficit accumulated over more than a decade. Closing it will take a comparable period. The honest assessment of what robotic construction contributes to the housing supply problem over the next five years is modest: it likely enables 5 to 10% more completions than would otherwise occur in the markets where it is deployed, by removing the labor constraint from the tasks it covers. That is meaningful. It is not transformational at the national scale in a five-year window.

The 10-year and 20-year picture is more interesting, if the technology continues to advance and the deployment model proves commercially durable. A construction industry where autonomous systems handle 40 to 50% of the structural work on new residential projects is a construction industry that can sustain the production rates needed to close the deficit - even as the skilled trades workforce continues to age.

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