US ADU Legalization Map 2026
Check ADU legalization status by state and major city — legal, variance-required, or banned. The landscape is shifting fast.
Legal
6
jurisdictions
Variance
5
jurisdictions
Banned
1
jurisdictions
| State | City/Area | Status | Details |
|---|---|---|---|
| California | Statewide | Legal | ADUs legal since 2017; legal nonconforming lots; SB 9 allows two units per lot |
| Oregon | Statewide | Legal | ADUs legal statewide (HB 2001); zoning required |
| Washington | Seattle | Legal | Legal in most zones; tax abatement available |
| Colorado | Denver | Legal | Legal in many zones; inclusionary housing incentives |
| Texas | Austin | Legal | Legal in most zones (CodeNEXT alignment); expedited permitting |
| North Carolina | Raleigh | Variance | Variance required; growing support for legalization |
| Tennessee | Nashville | Legal | Legal in most zones; affordability focus |
| Georgia | Atlanta | Variance | Conditional use permit required in most zones |
| Florida | Tampa | Variance | Variance/conditional use in most zones; no statewide mandate |
| Massachusetts | Boston | Variance | Accessory dwelling units allowed by variance; state bill pending |
| New York | New York City | Banned | Generally banned; limited pilots in specific neighborhoods |
| Illinois | Chicago | Variance | Allowed in some zones by variance; expanding slowly |
📍 Check your local ADU rules in detail.
ADU laws change frequently and vary by city within states. This map is a high-level snapshot. Always confirm with your local zoning authority or a land-use attorney before planning.
Data & method: Status is based on 2026 municipal code reviews and recent zoning changes. Laws change frequently — confirm with your local planning/zoning department before making decisions.
Update frequency: This map is refreshed twice yearly as new jurisdictions legalize ADUs.
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