Source-CitedPrimary Statutes51 JurisdictionsUpdated June 2026

ADU Preemption by State

Does your state limit how cities can restrict accessory dwelling units? State ADU preemption laws override local zoning rules — meaning a city cannot be more restrictive than the state floor. Scroll the table or search your state to see the verified status for all 51 U.S. jurisdictions.

Jurisdictions Covered
51 (50 states + DC)
With Statewide Preemption
9 verified
No Statewide Preemption
2 verified
Status
Unconfirmed / Unreachable

Each row shows the verification status for that state’s ADU preemption law. Verified rows include the authoritative citation and the date we last confirmed it. Unconfirmed rows indicate a candidate provision was found but applicability could not be definitively established. Source unreachable rows reflect an access limitation at verification time — not a finding that no law exists. Consult the state legislature website directly for the most current information.

StateStatusPreemptionCitationLast Verified
AlabamaUnconfirmed———
AlaskaUnconfirmed———
ArizonaVerifiedYesA.R.S. §9-461.18 — Accessory dwelling units; regulation; applicability; definitions2026-06-18
ArkansasUnconfirmed———
CaliforniaVerifiedYesCal. Gov. Code §66316 – ADU Approval Requirements (null-and-void enforcement) + §66317(a)(3) – 60-day ministerial approval (formerly § 65852.2 (ADU) + § 65852.22 (JADU), repealed by SB 477, 2024)2026-06-18
ColoradoVerifiedYesC.R.S. §29-35-103 — Accessory Dwelling Unit Requirements for Subject Jurisdictions (HB24-1152, Accessory Dwelling Units Act, codified at C.R.S. §§29-35-101 et seq.)2026-06-18
ConnecticutVerifiedYesCT Public Act 21-29, Sec. 6 (NEW, eff. January 1, 2022) — Accessory apartment mandate, codified at C.G.S. §8-2g2026-06-18
DelawareUnconfirmed———
District Of ColumbiaUnconfirmed———
FloridaUnconfirmed———
GeorgiaUnconfirmed———
HawaiiVerifiedYesHRS §46-4.8 — Accessory dwelling units on residentially zoned lots2026-06-18
IdahoUnconfirmed———
IllinoisSource unreachable———
IndianaUnconfirmed———
IowaUnconfirmed———
KansasUnconfirmed———
KentuckyUnconfirmed———
LouisianaUnconfirmed———
MaineUnconfirmed———
MarylandUnconfirmed———
MassachusettsUnconfirmed———
MichiganUnconfirmed———
MinnesotaUnconfirmed———
MississippiUnconfirmed———
MissouriUnconfirmed———
MontanaUnconfirmed———
NebraskaUnconfirmed———
NevadaUnconfirmed———
New HampshireVerifiedRegulation is localN.H. Rev. Stat. §674:72 — Accessory Dwelling Units2026-06-18
New JerseyUnconfirmed———
New MexicoUnconfirmed———
New YorkUnconfirmed———
North CarolinaSource unreachable———
North DakotaUnconfirmed———
OhioUnconfirmed———
OklahomaUnconfirmed———
OregonVerifiedYesORS 197A.425 — Accessory dwelling units (formerly ORS 197.312, renumbered 2023)2026-06-18
PennsylvaniaUnconfirmed———
Rhode IslandVerifiedYesRIGL §45-24-73 — Consistent statewide treatment of accessory dwelling units required2026-06-18
South CarolinaUnconfirmed———
South DakotaUnconfirmed———
TennesseeUnconfirmed———
TexasUnconfirmed———
UtahVerifiedYesUtah Code §10-21-303 — Internal accessory dwelling units2026-06-18
VermontVerifiedRegulation is local24 V.S.A. §4412(1)(E) — Required provisions and prohibited effects2026-06-18
VirginiaUnconfirmed———
WashingtonVerifiedYesRCW 36.70A.680 — Accessory dwelling units — Local regulation2026-06-18
West VirginiaUnconfirmed———
WisconsinUnconfirmed———
WyomingUnconfirmed———
Disclaimer: PropertyZoned.com provides statewide preemption data for general research purposes only. Statutes change frequently — verify current law directly with the relevant state legislature or a licensed real estate attorney before relying on this information. Unconfirmed and Source unreachable entries indicate that we could not confirm or access the authoritative source at last verification time; they are not a finding that no law exists. PropertyZoned.com is not affiliated with any government agency.