Gijo John Cambridge has existing ADU rules, but Maryland HB 1466 creates an important 2026 transition. Learn the old 40% size rule, the state’s 75% standard, parking, Board of Appeals review, owner occupancy and what to verify before designing an ADU.
Cheverly ADU projects can trigger both Town and Prince George’s County permits, annual Town rental licensing, local accessory-structure and lot-coverage rules, and an active 2026 Town Planning Board review of ADU regulations.
District Heights adds its own building-permit, rental-license and housing-inspection layer on top of Prince George’s County ADU zoning. This guide separates the City process from the County’s still-pending 2026 ADU legislation.
New Carrollton ADU projects can require both Prince George’s County and City building permits. The City also runs its own inspection process and annual rental licensing, making New Carrollton materially different from a county-only approval path.
Mount Rainier ADU projects require more than checking Prince George’s County zoning. The City adds its own permit and rental-license layer, while the Mount Rainier Neighborhood Conservation Overlay Zone and Design Review Board can affect design, height, accessory structures and variance review.
Hyattsville ADU projects follow Prince George’s County zoning and building approval, while the City adds annual rental licensing and inspections, certain local site permits, and coordination with County historic-preservation review.
Greenbelt homeowners face a distinctive ADU approval stack: Prince George’s County zoning, a City building permit, annual City rental licensing, and for many historic-core properties the Greenbelt Neighborhood Conservation Overlay Zone.
Bowie homeowners face a two-layer approval system: Prince George’s County controls zoning and construction-code approval, while the City of Bowie adds its own building permit and rental-license requirements. This 2026 guide explains what applies now and what is still changing before Maryland’s October 1 ADU deadline.
College Park ADU planning requires more than checking Prince George’s County zoning. The City adds its own building permit, rental-occupancy rules and Old Town historic-district review, while County ADU legislation remains in motion in September 2026.
There is no single statewide ADU height limit in Maryland. This guide explains how local accessory-structure rules, detached ADU design, setbacks, lot coverage and 2026 law changes affect how tall an ADU can be.
