One region, five counties
We build accessory dwelling units across Southern Maryland and the close-in DC suburbs. Every town below gets the same deal: a free walk of your lot, a straight answer about what the county allows, and a written price before you commit to anything.
Charles County — home turf
This is where our trucks are every day: Waldorf, La Plata, White Plains, St. Charles, Bryans Road, Indian Head, Hughesville, Pomfret, Port Tobacco, Nanjemoy, Dentsville, and Benedict. We know the county's published draft ADU rules (Bill 2026-06) lot by lot — the 1,000-square-foot / 75% size cap, the setback lines, the health-department sign-off order — and we are tracking its final adoption as the October 1, 2026 state deadline lands.
Prince George's County
Bowie, Upper Marlboro, Clinton, Fort Washington, Oxon Hill, Accokeek, Brandywine, Cheltenham, Camp Springs, Largo, Mitchellville, Suitland, Laurel, and Beltsville. The county's ADU bill (CB-74) moved through committee in September 2026, and state law required the county to adopt its ADU rules by October 1, 2026 — we are watching for the final vote. Because the rules are still settling, we check the current published rules for your exact address before we promise anything.
Montgomery County
Bethesda, Silver Spring, Rockville, Gaithersburg, Germantown, Potomac, Chevy Chase, Takoma Park, Wheaton, Olney, and Kensington. Montgomery is updating its zoning to match Maryland's 2025 ADU law (the county's ZTA 26-06 is still pending), so this market is in motion too. If your lot is here, we will walk it and tell you where the rules stand right now — not where a blog post from last year says they stand.
St. Mary's & Calvert Counties
Leonardtown, Lexington Park, California, Great Mills, and Mechanicsville in St. Mary's; Prince Frederick, Lusby, Dunkirk, Owings, and Huntingtown in Calvert. Much of this area runs on well water and septic systems, which makes the health-department check the first step on almost every lot — we plan for that from the first visit instead of discovering it at permit time.
Why the county matters so much
Maryland's 2025 ADU law (Chapter 197 of the Laws of Maryland) sets the floor for the whole state: counties must decide complete ADU applications within 90 days, in a plain ministerial review with no discretionary hearing, and they cannot ban ADUs with vague rules about "neighborhood compatibility." But each county still fills in the details — size caps, setbacks, fees, and permit steps. That is why we check your county's current rules for your address before we draw a single line.
Sources: Maryland General Assembly — Chapter 197 of the 2025 Laws of Maryland (HB 1466/SB 891); Charles County Bill 2026-06 / ZTA 25-189 (published draft); Prince George's County Council legislation (CB-74); Montgomery County Council (ZTA 26-06).
Every project type, in every town
Whatever you want to build — and wherever your lot sits — there is a page that walks through it. Pick your project type:
- Detached backyard cottages — a brand-new small home in your backyard
- Backyard cottage ADUs — detached cottages planned around your lot
- Garage conversions — your garage becomes a legal apartment
- Attached ADUs — a new home joined to your house
- In-law suites — an addition with its own entrance, built for family
- Basement apartments — a legal second unit below your main floor
- Above-garage units — living space over a detached garage
- Custom ADUs — drawn from scratch for your lot and your family
- Aging-in-place ADUs — no-step entries and one-level living
- Rental income ADUs — built to cash-flow as a long-term rental
- Home office ADUs — a quiet, wired workspace apart from the house
- Small & studio ADUs — compact homes that live bigger than their footprint
- Prefab ADUs — factory-built units, permitted and installed on your lot
Want to see how the whole job unfolds? Our 5-step process walks you from the free lot visit to move-in day.