50-State ADU Zoning & Permit Laws Directory
Compare state-level Accessory Dwelling Unit statutes, maximum allowable square footage, rear/side setback minimums, and state construction grants (Updated for 2026).
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| State | State Law Mandate | Max Allowable SqFt | Setback Minimums | Owner-Occupancy Rule |
|---|---|---|---|---|
| California | By-Right Statewide (AB 1033/SB 9) | 1,200 SqFt | 4 ft Rear & Side | ❌ Banned (No owner-occupancy needed) |
| Washington | HB 1337 Statewide Mandate | 1,000 SqFt | 0-5 ft Setbacks | ❌ Banned |
| Oregon | HB 2001 Statewide Mandate | 900-1,000 SqFt | 4 ft Setbacks | ❌ Banned |
| Colorado | HB 24-1152 Statewide Mandate | 1,000 SqFt | 5 ft Setbacks | ❌ Banned in municipalities >1k pop |
| Arizona | HB 2720 Statewide Mandate | 1,000 SqFt | 5 ft Setbacks | ❌ Banned in cities >75k pop |
| Texas | City-by-City (Austin HOME Initiative) | 850-1,100 SqFt | 5-10 ft Setbacks | Local Option (Austin/Dallas allows) |
| Florida | Local Municipal Ordinance | 800-1,000 SqFt | 5-10 ft Setbacks | Varies (Miami/St. Pete friendly) |
| Utah | HB 82 Internal ADU Mandate | No state cap (Internal) | Internal garage/basement | Required in some single-family zones |
| New York | Local Option (NY Plus ONE Grants) | 800-1,200 SqFt | 5-10 ft Setbacks | State Grant Eligible (up to $125k) |
| Massachusetts | Affordable Homes Act (By-Right) | 900 SqFt | Local Setbacks | ❌ Banned Statewide in 2025/2026 |
| Maine | LD 2003 Statewide Mandate | No state size limit | Standard Building Code | ❌ Banned |
| Vermont | HOME Act Statewide By-Right | 900 SqFt or 30% of main | Standard Setbacks | ❌ Banned |
| Connecticut | Public Act 21-29 Statewide | 1,000 SqFt | Standard Setbacks | ❌ Banned unless opt-out |
| New Hampshire | RSA 674:71-73 Statewide | 750 SqFt minimum | Standard Setbacks | Allowed to require owner-occupancy |
| North Carolina | Local Municipal Ordinance | 800-1,000 SqFt | 5-10 ft Setbacks | Varies (Raleigh/Charlotte progressive) |
| Georgia | City-by-City (Atlanta Affordable Housing) | 750-1,000 SqFt | 5-10 ft Setbacks | Varies by county |
| Virginia | City-by-City (Alexandria / Arlington) | 800-1,000 SqFt | 5 ft Setbacks | Local county option |
| Nevada | Local County (Clark / Washoe) | 1,000-1,200 SqFt | 5-10 ft Setbacks | Local county option |
| Hawaii | Act 39 Statewide By-Right | 800-1,000 SqFt | Standard Setbacks | Permitted on residential lots |
| Illinois | City Ordinance (Chicago ADU Ordinance) | 700-1,000 SqFt | 3 ft Rear & Side | Pilot zones expanded citywide |