Not all housing markets are created equal when it comes to construction. Some metros are building at a pace that keeps up with population growth and demand. Others have spent decades throttling supply through restrictive zoning, lengthy permitting processes, and community opposition. The result: a patchwork of abundance and scarcity that shapes where Americans can afford to live.
Measuring the Deficit
We calculate the construction deficit as the difference between units needed (based on household formation, demolitions, and vacancy normalization) and units actually permitted and built. This metric reveals stark differences across the country:
Most Underbuilt Metros (Units Needed vs. Permitted, Annual Average 2020-2025)
| Metro | Annual Need | Avg Permitted | Deficit | Deficit % |
|---|---|---|---|---|
| Los Angeles | 58,000 | 25,400 | 32,600 | -56% |
| San Francisco | 22,000 | 8,200 | 13,800 | -63% |
| New York | 65,000 | 38,500 | 26,500 | -41% |
| San Jose | 14,000 | 5,800 | 8,200 | -59% |
| Boston | 18,000 | 10,200 | 7,800 | -43% |
| Seattle | 24,000 | 18,500 | 5,500 | -23% |
| San Diego | 16,000 | 7,800 | 8,200 | -51% |
| Miami | 32,000 | 22,000 | 10,000 | -31% |
Closest to Meeting Demand
| Metro | Annual Need | Avg Permitted | Balance |
|---|---|---|---|
| Houston | 42,000 | 48,500 | +15% |
| Dallas-Fort Worth | 45,000 | 51,200 | +14% |
| Austin | 22,000 | 28,500 | +30% |
| Raleigh | 12,000 | 14,800 | +23% |
| Phoenix | 34,000 | 38,200 | +12% |
| Nashville | 14,000 | 16,500 | +18% |
The pattern is clear: Sun Belt metros with fewer regulatory barriers are meeting or exceeding demand, while coastal metros with restrictive land use are chronically underbuilding. San Francisco builds just 37% of what it needs. Los Angeles manages only 44%. Meanwhile, Austin builds 130% of projected need.
The Regulatory Barrier
Research consistently identifies land use regulation as the primary driver of construction deficits. Key barriers include:
- Single-family zoning: Prohibits multi-family construction on 75%+ of residential land in most metros
- Minimum lot sizes: Require ยผ acre or more per unit, dramatically limiting density
- Height limits: Restrict buildings to 2-3 stories in many areas near transit and jobs
- Parking minimums: Require 1.5-2 parking spaces per unit, adding $30,000-$75,000 per unit in construction costs
- Discretionary review: Allow community opposition to delay or kill projects that comply with existing zoning
- Impact fees: Can exceed $50,000 per unit in some California jurisdictions
The Permitting Timeline
Average time from permit application to construction start varies enormously:
- Houston: 2-3 months
- Dallas: 3-4 months
- Denver: 6-8 months
- Seattle: 8-12 months
- Los Angeles: 12-18 months
- San Francisco: 18-36 months
Time is money in construction. Every month of delay adds carrying costs, increases interest expenses, and reduces the return that makes a project financially viable. In San Francisco, permitting delays alone add an estimated $60,000-$100,000 per unit to final costs.
What Works: Policy Reforms That Increase Supply
Several jurisdictions have enacted reforms that demonstrate supply can be unlocked:
Oregon (2019)
Banned single-family-only zoning statewide for cities over 10,000 population. Required allowance of duplexes on all residential lots and fourplexes in cities over 25,000.
California SB 35 (2017)
Streamlined permitting for housing projects that meet existing zoning and affordability requirements. Has accelerated approval of over 18,000 units in its first five years.
Montana (2023-2024)
Passed sweeping zoning reform allowing duplexes on single-family lots, reducing parking mandates, and limiting local barriers to housing production. Permits increased 22% in the first year.
The evidence is overwhelming: where we allow housing to be built, it gets built. Where we don't, it doesn'tโand prices rise until they push people out.
Data Sources
Census Bureau Building Permits Survey, HUD SOCDS Permits Database, Up for Growth Housing Underproduction Report (2024), Wharton Residential Land Use Regulatory Index, California Housing Partnership