The 10 basement finishing contractors from Google's results for Washington, DC, District of Columbia, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
Licensing in District of Columbia. DC requires a home improvement contractor license from the Department of Licensing and Consumer Protection (DLCP).
on GoogleWashington, DC
In Washington, DC, this contractor converts basements into accessory apartments and condominium units, covering design, permits and construction. Its work also includes underpinning and digging out basements to add usable space, along with standard finishing and renovation.
(202) 813-1571 1724 20th St NW, Washington, DC 20009
on GoogleGaithersburg, MD
Basement Lowering DC underpins and lowers basement floors so that low-ceilinged lower levels in the Washington, DC area can become usable living space. The company is based in Gaithersburg, Maryland, and also handles basement finishing.
(240) 418-2636 18219 Flower Hill Way ste d, Gaithersburg, MD 20879
on GoogleReisterstown, MD
A-1 Renovations is a Reisterstown general remodeling contractor serving Greater Baltimore and Baltimore County. Projects run from single-room updates to full-home renovations, with kitchens, bathrooms, basements and home additions among its main trades.
(443) 622-1926 18 Blacksmith Ct, Reisterstown, MD 21136
on GoogleMcLean, VA
Cosmo Builders finishes and remodels basements in Washington, DC and Northern Virginia from an office in McLean. The design-build firm also takes on kitchens, bathrooms, whole-home remodels, second-story and garage additions, decks and porches, roofing and siding, and custom home construction.
(703) 835-1831 1765 Greensboro Station Pl Tower 1, Suite 900, McLean, VA 22102
on GoogleMcLean, VA
Based in McLean, Home Perfection Contracting finishes basements for homeowners in Washington, DC, Montgomery County, and Fairfax and Arlington counties. Its lower-level projects include family rooms, home offices, basement kitchenettes and wet bars.
(703) 503-3471 1775 Tysons Blvd Ste 4134, McLean, VA 22102
on GoogleWhite Plains, MD
BAMU Design Build remodels bathrooms across DC, Maryland and Virginia, keeping design, planning and construction with a single team. Bathroom projects involve rethinking the layout, coordinating plumbing and choosing materials, and the White Plains, MD firm also finishes basements.
(301) 971-2268 4313 Charles Crossing Dr Unit A, White Plains, MD 20695
on GoogleWashington, DC
DMV Home Improvement finishes and remodels basements in Washington, DC, turning underused or unfinished lower levels into bedrooms, living areas and wet bars. Projects focus on converting unused square footage into rooms the household can use every day.
on GoogleKensington, MD
Merrick Design and Build is a design-build remodeler in Kensington that finishes and remodels basements for homeowners in Bethesda, Maryland. It works on both raw, unfinished basements and lower levels that already have drywall in place.
(301) 946-2356 10801 Connecticut Ave, Kensington, MD 20895
on GoogleWashington, DC
Based in the Washington, DC area, this contractor remodels and finishes basements for homeowners in Northern Virginia and Southern Maryland. Projects convert underused lower levels into custom living spaces designed to match the look of the rest of the house.
on GoogleVienna, VA
MOSS Building & Design remodels basements in Washington, DC, Maryland and Northern Virginia, working from Vienna. Past projects include a basement primary suite in Sterling, a wet bar and fireplace in Haymarket, and a Falls Church lower level with a family room, exercise room, bar and guest suite.
(703) 459-9023 108 Church St NW, Vienna, VA 22180
In Washington, DC, a basic finish typically costs $26,500 – $53,000. Remodeling labor in Washington, DC runs about 6% above the US median, which accounts for most of the difference from the same project elsewhere.
These are the firms from Google's results for "basement finishing washington dc", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
Only with an emergency escape opening, usually an egress window of a minimum size with a window well, plus the ceiling height your local code requires. Without them it cannot legally be sold as a bedroom.