Charles County Bill 2026-06 is enacted and effective August 21, 2026. See the current ADU size rules, detached-unit path, parking, septic/water review, permits and property-specific checks.
Harford County currently allows one attached or interior ADU for a relative, with a 300-sq-ft minimum and a cap of the lesser of 1,500 sq ft or 50% of the main home. Here’s what applies now and what still needs 2026 alignment.
Queen Anne’s County currently allows one accessory guest residence/apartment up to 1,500 sq ft under §18:1-48. Ordinance 26-15 proposes a new by-right ADU framework for 2026; here’s what applies now and what remains pending.
Carroll County’s adopted ADU ordinance: 75% floor-area and footprint limits, three-bedroom maximum, parking, placement, preservation exclusions and permit checks.
Aberdeen adopted its ADU zoning, school-capacity and utility-fee ordinances on September 28, 2026. All three list October 19 as the effective date. Confirm the rules for your filing date.
Chesapeake Beach has its own ADU zoning rules separate from Calvert County. Compare the current 650-sq-ft legacy cap, owner occupancy, parking conflict, 5-ft accessory-building setback, 2026 draft changes and HB 1466 transition.
Annapolis has its own ADU zoning rules separate from Anne Arundel County. Compare the current 850-sq-ft rule, owner occupancy, special exceptions, parking, stormwater, historic-district review and the 2026 HB 1466 transition.
A Frederick, MD mailing address does not tell you which ADU zoning rules apply. Compare unincorporated Frederick County, the City of Frederick and Walkersville across size, parking, setbacks, owner occupancy and permit responsibility.
Maryland has no single ADU setback number. State law generally caps side/rear ADU setbacks at the local accessory-structure setback. Compare current county examples including 2½-ft, 5-ft, 6-ft and district-specific rules.
Baltimore Bill 26-0195 received a favorable committee recommendation with amendment. Check the October 22 hearing, current zoning pathways, CHAP review and proposed ADU standards.
