In San Jose, California, single-family zoning covers approximately 94 percent of residential land. High-density multifamily housing is permitted in only a small fraction of the city, near transit corridors. The results are predictable: housing supply cannot expand to meet demand in the forms that would be most economically efficient; median home prices exceed $1 million; and workers who cannot afford local housing commute from more affordable regions 50–100 miles away, contributing to traffic congestion and carbon emissions. San Jose is an extreme example of a widespread phenomenon: land use regulation that restricts housing supply in high-productivity labor markets is arguably the most consequential economic policy made at the local level — affecting wages, housing costs, economic mobility, and long-run growth across the entire economy.
What it is
Zoning is a local government regulatory system that divides a jurisdiction into zones, each specifying permitted land uses, building types, density limits, setbacks, and height restrictions. Standard zones include:
- Residential zones: single-family only (R-1), two-family (R-2), multifamily (R-3 and higher), each allowing progressively higher density
- Commercial zones: retail, office, and mixed-use development
- Industrial zones: manufacturing, warehousing, and logistics
- Special overlay zones: historic preservation, flood zones, transit-oriented development
Zoning is the primary tool through which communities control land use — determining whether a neighborhood will have houses, apartments, shops, factories, or some combination. The American Planning Association maintains comprehensive data on local zoning practices and reform efforts.
The intended effect
Zoning was developed in the early 20th century to prevent nuisance land uses — keeping slaughterhouses out of residential neighborhoods, factories away from schools. These externality-correction functions are broadly legitimate: separating incompatible land uses protects residential property values and community livability.
Modern zoning serves additional purposes: preserving neighborhood character, managing traffic and school capacity, and guiding infrastructure investment. The HUD Fair Housing Act guidance acknowledges that zoning can serve legitimate community planning purposes when it does not discriminate based on protected class.
The tradeoff
The economics of restrictive zoning is clear and consistent: land use restrictions reduce housing supply in high-demand markets, drive up prices, and exclude lower-income households from high-opportunity areas.
Economist Ed Glaeser and colleagues estimated that restrictive zoning in New York, San Francisco, and San Jose alone reduces U.S. GDP by approximately 2 percent by preventing workers from moving to high-productivity cities — a $400+ billion annual cost from geographic misallocation. The NBER research on housing regulation and economic outcomes documents these costs rigorously.
The FHFA's house price index shows that home prices have risen fastest in the most restrictively zoned metropolitan areas — a direct supply-restriction premium that pricing theory predicts.
How it plays out in practice
Zoning reform has become one of the most active areas of state-level housing policy. California's Senate Bills 9 and 10 (2021), Oregon's statewide exclusionary zoning ban (2019), and Minneapolis's elimination of single-family-only zoning (2019) all represent state or local efforts to override restrictive local zoning to expand housing supply. The U.S. Census Bureau's housing starts data will be the long-run scorecard for whether these reforms produce measurable supply increases — and whether increased supply moderates the housing cost trajectory in reformed markets.
The Biden and Trump administrations both identified restrictive zoning as a major housing policy challenge, with the HUD and Treasury analysis of housing affordability arguing that federal grants should be conditioned on local zoning reform to unlock housing construction near high-opportunity jobs.
