Zoning & Regulations

Check Maryland floodplain maps, state and local permits, floor elevations, garage restrictions and the 50% improvement test before designing an ADU.

Compare Harford’s 3-foot, 10-foot and townhouse shed rules, check recorded easements, and understand why small and prefab sheds still need permits.

Learn when Carroll County’s 5-foot rear-yard shed rule applies, which movable sheds may be permit-exempt, and what to verify before delivery.

Check Frederick County’s 6-foot shed clearances, house-footprint size limit, 150-square-foot permit boundary and well/septic restrictions before ordering.

Compare published R-60, R-90 and R-200 shed and garage setbacks, height and length adjustments, small-shed permits, and the ADU checks to make with DPS.

Planning a Maryland ADU on septic? Learn how bedroom count, design flow, reserve area, wells and local Health Department review can affect feasibility.

Buying a Maryland property because you want to add an ADU? Check jurisdiction, zoning, surveys, setbacks, septic, utilities, overlays, HOA rules and rental restrictions before you make an offer.

Montgomery County Bill 41-26 would remove the ADU rental-license owner-occupancy requirement and create fee relief for qualifying affordable ADUs. Track what is proposed, what applies now, and the October 6, 2026 hearing.

Quick answer: Historic status does not create one simple statewide “yes” or “no” answer for a Maryland ADU. A property can be eligible for an ADU under HB 1466 and still need separate historic-preservation review. The first question is what kind of historic status applies: a local historic district, an individually designated local landmark, a … Read more

Quick answer: A Maryland property can be eligible for an ADU and still face a separate Chesapeake Bay or Atlantic Coastal Bays Critical Area review. The most important first step is to determine whether the parcel is inside the Critical Area and, if so, whether it is classified as an IDA, LDA or RCA. The … Read more