These 2 Cities Enacted Upzoning Policies to Boost Housing Development. It’s Working, Study Says.

Why It Matters

The results demonstrate that targeted zoning reforms can meaningfully increase housing supply, offering a policy lever for cities grappling with affordability crises. They also highlight the need for supportive measures to ensure benefits are broadly distributed and to mitigate displacement risks.

Key Takeaways

• NYC upzoning added ~4,000 units in four years
• Philadelphia upzoned areas generate 4,000 permits annually
• Upzoning effects stronger where markets already attracted investment
• Complementary policies like inclusionary housing boost upzoning success
• Some upzoned zones saw no growth, highlighting market limits

Pulse Analysis

Upzoning—allowing higher density on land previously limited to single‑family homes—has become a centerpiece of U.S. cities’ strategies to address a chronic housing shortage. The 2010s saw the lowest single‑family construction in six decades, prompting policymakers to relax restrictive zoning grids that have long constrained supply. By permitting taller buildings and more units per parcel, cities aim to unlock dormant land value and accelerate construction without expanding outward into greenfield sites.

The Urban Institute’s April 2026 analysis provides early empirical evidence that such reforms can work when paired with other levers. In New York, neighborhood‑specific upzoning coupled with the Mandatory Inclusionary Housing program generated about 4,000 extra units within four years, outpacing comparable non‑upzoned parcels. Philadelphia’s citywide zoning overhaul, effective since 2012, began delivering a steady stream of roughly 4,000 permits per year after 2018, buoyed by the impending end of a decade‑long tax‑abatement incentive. Both cases suggest that upzoning’s impact is amplified in markets already attracting private investment and that timing of fiscal incentives matters.

For other municipalities, the findings underscore two practical lessons. First, zoning reform should be integrated with affordability safeguards—such as inclusionary housing or rent‑stabilization—to ensure new units serve a broad income spectrum and to temper displacement concerns. Second, policymakers must recognize that upzoning is not a universal cure; areas with weak demand may see little change, indicating a need for complementary economic development measures. As more cities experiment with density‑boosting policies, rigorous monitoring will be essential to fine‑tune the balance between supply growth and equitable outcomes.