ADU Laws in Maryland (2026)
Maryland state ADU law details, key provisions, preemption status, and recent legislative changes for accessory dwelling units.
Law Name
State ADU Law
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
Yes
Key Provisions
Maryland does not have a statewide ADU preemption law as of 2026
ADU regulation is left to local jurisdictions — each county and municipality sets its own rules
Montgomery County, Prince George's County, and Baltimore City have their own ADU ordinances
Maryland has been actively discussing statewide housing reform legislation but comprehensive ADU mandates have not passed as of 2026
Maryland Department of Housing and Community Development provides guidance and incentives for affordable housing including ADUs
Legislative History
2023 — Various Maryland Housing Reform Bills (proposed, not enacted as ADU mandate)
Maryland Legislature considered several housing supply bills including ADU by-right provisions but a comprehensive statewide ADU preemption law had not been enacted by 2026. Local jurisdictions retain control.
Official Sources
Source: Maryland State ADU Law. Last verified April 5, 2026. View source