Here is the central paradox of American housing: the places where homes are most needed build the least, and the places where homes are cheapest build the most. It's not a mystery — it's a policy choice, enforced through zoning, regulation, and local politics.
The Numbers Don't Lie
We analyzed 2024 Census building permit data for all 373 metros in our database and grouped them by affordability score. The result is striking: metros with the worst affordability (scores below 30) permitted an average of just 1.5 housing units per 1,000 residents. Metros with good affordability (scores above 70) permitted 3.6 per 1,000 — more than double the rate.
This isn't a coincidence. It's the mechanism by which housing becomes expensive: restrict supply, watch prices rise, then watch the people who can't afford it leave.
Case Studies in Contradiction
San Jose, CA (Affordability Score: 8) — One of the most expensive metros in America, with a median home price over $1.4 million. Yet it permitted roughly 1.2 units per 1,000 residents in 2024. The demand is there. The land is there (if you allow density). The political will is not.
Houston, TX (Affordability Score: 68) — America's 4th-largest metro, with 48,000 permits in 2024. Houston famously has no zoning code. The result: housing gets built where demand exists, keeping prices far below peer metros. A similar-sized home costs 3× more in LA than Houston.
Cape Coral-Fort Myers, FL — Permitted 18.7 units per 1,000 residents. This isn't a small town overbuilding — it's a metro of 900,000+ people where permissive regulation meets massive demand.
Why Expensive Cities Don't Build
The reasons are well-documented and, from a free-market perspective, maddening:
- Exclusionary zoning: 75% of residential land in many cities is zoned exclusively for single-family homes. No apartments, no townhomes, no duplexes. This is government-mandated housing scarcity.
- Environmental review (CEQA/NEPA): In California, a single environmental lawsuit can delay a housing project by 3-5 years. The law is routinely weaponized by NIMBYs and competitors.
- Historic preservation: Well-intentioned but often used to prevent any change in wealthy neighborhoods.
- Parking minimums: Requiring 1-2 parking spots per unit adds $30,000-$75,000 per unit in construction costs and limits density.
- Permitting delays: Getting a building permit in San Francisco takes 2-3 years. In Houston, it takes weeks.
- Incumbent homeowner politics: Existing homeowners benefit from rising prices and have every incentive to oppose new construction. They vote in local elections; renters and would-be residents do not.
The Cost of Underbuilding
When a metro permits 1.5 units per 1,000 residents while growing at 1% per year, the math is simple: demand exceeds supply, prices rise, and lower-income residents are pushed out. This is why America is 7.3 million homes short.
The solution isn't complicated — it's political. States like Texas, Florida, and the Carolinas demonstrate that when you let people build, they build. The expensive metros that want to solve their housing crisis already have the answer. They just have to let it happen.
Explore building permit data for any metro on our interactive map (select "Building Permits" metric).