US Housing Policy and Zoning Reform: State Preemption and Transit Upzoning Take Center Stage in 2026
As housing affordability remains a paramount economic concern in mid-2026, state-level legislative action is increasingly shifting toward supply-side deregulation. Recognizing that local municipal zoning often acts as a bottleneck to new housing construction, several state legislatures have enacted sweeping reforms that preempt local authority. These measures are designed to unlock housing supply, streamline permitting, and expand housing options like Transit-Oriented Development (TOD) and Accessory Dwelling Units (ADUs).
1. California: Transit-Oriented Upzoning and CEQA Exemptions
California continues to lead on housing supply innovation with major reforms taking effect in mid-2026:
- Senate Bill 79 (Abundant and Affordable Homes Near Transit Act): Signed into law in late 2025, SB 79 is scheduled to officially take effect on July 1, 2026. The law mandates upzoning near major transit stations, allowing developers to build taller, denser residential structures regardless of restrictive local municipal zoning codes.
- Assembly Bill 130: This bill streamlines the development pipeline by exempting many urban infill housing projects from the historically complex and litigation-heavy California Environmental Quality Act (CEQA) review process, significantly reducing administrative delays and legal costs.
"SB 79 is paired with broader state reforms that streamline environmental reviews and permitting for infill housing. For example, Assembly Bill 130 exempts many infill housing projects from the California Environmental Quality Act (CEQA), a historically complex review process that has long delayed housing development." — Elizabeth Nimmons, NAHREP Housing Hub
2. Arizona: Accessory Dwelling Unit (ADU) Rights Expansion
Arizona is tackling suburban and rural supply constraints through legislative preemption:
- House Bill 2928: This law strengthens statewide requirements for ADUs in municipal and county zoning codes. HB 2928 mandates that counties and municipalities allow at least one attached and one detached ADU on any lot where single-family homes are permitted.
- Restrictions on Local Red Tape: The law explicitly curtails local municipal authority to impose restrictive regulations on ADU size, setbacks, and parking requirements, creating a streamlined, by-right pathway for accessory housing development.
3. Florida: Live Local Act State Preemption
Florida's Live Local Act, originally passed in 2023 and expanded through updates in 2025 and 2026, continues to reshape development patterns throughout the state:
- By-Right Commercial-to-Residential Conversion: The act allows developers to build multifamily and mixed-use housing on sites zoned for commercial, industrial, or mixed use without requiring a rezoning or public hearings, provided that at least 40% of the residential units are set aside as affordable or workforce housing.
- State-Level Preemption: By overriding local zoning restrictions, Florida's legislature has enabled rapid housing development in fast-growing urban and suburban corridors where land-use restrictions previously blocked multifamily projects.
Broader Implications for the US Housing Market
These state-level policy shifts represent a fundamental structural change in the housing market. By relying on state-level preemption to override local NIMBY ("Not In My Backyard") zoning hurdles, policy makers are aiming to expand residential supply directly. For homebuilders and real estate developers, these reforms unlock previously restricted land parcels, create new infill development opportunities, and streamline permitting processes, helping to introduce new housing supply that could eventually ease affordability constraints.