Zillow: 300,000+ Listed Lots Point to Infill Boon for Builders
Zillow's latest data drop counts more than 300,000 vacant residential lots for sale nationwide — a number that reframes the housing shortage conversation. The lots exist. The homes to put on them are the missing piece. For factory-built builders, that's the exact wedge the category was designed for.
What the Zillow Number Actually Means
HousingWire's coverage of Zillow's data release puts the count of listed vacant residential lots above 300,000 nationwide. That number reframes the "housing shortage" narrative that dominates industry commentary. The shortage isn't primarily a shortage of land — it's a shortage of finished units sitting on the land that exists. The lots are already carved out of subdivisions, already served by utilities, already zoned residential in most cases. What they lack is a house.
The distribution matters too. Zillow's data shows the concentration in second- and third-tier markets — not in dense urban cores where every parcel has been consumed. That means infill development, not greenfield sprawl, is the near-term opportunity. And infill development, at the parcel-by-parcel scale, is where factory-built categories have their structural advantage.
Why Factory-Built Wins the Infill Lot
A stick-built custom home on a single lot takes 9-18 months from broken ground to certificate of occupancy. A modular or manufactured home on the same lot can go from delivered-to-site to occupancy in 2-4 months. That timing difference is what turns a listed vacant lot into a closed sale rather than an aging listing.
The economics also favor factory-built at this scale. A single-lot custom build carries per-project overhead — site super time, general conditions, mobilizations — that gets amortized across a much smaller revenue base than a subdivision. Factory-built homes carry most of that overhead in the factory, not on site. Buyers considering a factory-built home on a lot they own or plan to buy can preview a home for the lot with Find Yours or run the address through The Land Check to see what the zoning actually allows.
The PERCH Read
We see the 300,000-lot number as the most important supply-side data point in housing right now. It reframes the shortage from a land problem to a fabrication problem — and fabrication is precisely what factory-built builders do. Buyers with a specific lot in mind can match to a lender that understands construction-to-permanent loans for factory-built homes. Builders who can turn listed lots into closed sales at scale can apply to the a PERCH factory partner network.
Frequently asked
Where are these vacant lots located?
Zillow's data shows concentration in second- and third-tier markets rather than dense urban cores. Most lots are in existing subdivisions with utilities and residential zoning already in place.
Why aren't the lots being built on?
Site-built custom construction on a single lot carries per-project overhead that hurts margins, and takes 9-18 months. Many lots sit because the traditional builder model doesn't fit the single-lot infill scale.
How does factory-built housing change the math?
Factory-built homes carry most of their overhead in the factory rather than on site, and can go from delivered to occupancy in 2-4 months instead of 9-18. That timing and overhead advantage turns listed lots into closed sales faster.