DC basement ADU conversions require owner-occupancy, zoning approval, and code compliance. Costs range $100K–$250K+. Basement Remodeling handles permits, design, and construction in 2–4 months.
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Alexandria, VA permits one ADU per single-family, two-family, or townhouse property, with rules on height, footprint, and occupancy. Oakwood Construction and Remodeling, LLC helps homeowners navigate zoning requirements and build garage conversion... read more
Home Perfection Contracting helps Northern Virginia homeowners plan accessory dwelling units, basement conversions, additions and in-law suites across Arlington and Fairfax County, navigating local zoning rules to turn design ideas into buildable,... read more
BBCDC Construction & General Contractors specializes in ADU development in Washington, DC, managing zoning compliance, permits, and construction for detached, semi-detached, and attached accessory dwelling units across all residential zones.read more
Finecraft Contractors is a Washington D.C.-based general contracting company with 35+ years in residential renovation. Services include kitchen remodels, bathroom upgrades, room additions, and full home gut renovations, backed by transparent proje... read more
Moore Construction Group designs and builds custom home additions in Alexandria, VA and Northern Virginia, including basement ADU conversions, rear additions, master suites, and sunrooms, adding space and value without moving.
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Gold Rhino Modular Homes & Buildings offers innovative solutions, customizable designs, ready-to-ship units, and pre-configured packages for containerized modular homes, multi-unit modular structures, modular container offices, and commercial/... read more
Four Brothers Design + Build specializes in Accessory Dwelling Units (ADUs) across DC, Northern Virginia & Maryland. Services include basement apartments, garage conversions, in-law suites & detached ADUs.
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Capital Dwelling is a Washington DC-based ADU specialist helping homeowners in the DMV region plan, design, and build accessory dwelling units. Services include feasibility assessments, permitting, architectural design, and construction management... read more
Tiny House Building Company, LLC, a licensed Fredericksburg, VA contractor, builds ADUs, tiny homes, and in-law suites. They offer turnkey design-build services, helping homeowners navigate Virginia's upcoming 2027 ADU law for easier, lower-cost c... read more
Excell Homes is a Northern Virginia ADU builder with 20+ years experience. They offer turnkey accessory dwelling units in Fairfax, Arlington & Alexandria, covering design, permitting & construction under one fixed-price contract.
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Montgomery County ADUs: ZTA 19-01 expanded accessory dwelling unit rules, removing bans on detached ADUs on small lots, lifting distance restrictions, easing parking near transit, and allowing garage conversions. Short-term rentals on ADU properti... read more
Elite Contractor Services in Annandale, VA builds Accessory Dwelling Units, home additions, basement finishing, kitchen remodeling, and bathroom renovations, helping homeowners create functional in-law suites, rental units, or extra living space t... read more
Ben Norkin Architecture outlines ADU permit drawing requirements in Montgomery County, MD, covering site plans, zoning, drainage, floor plans, structural drawings, and energy compliance for detached ADUs, garage conversions, and backyard cottages.... read more
JBL Construct LLC builds Accessory Dwelling Units (ADUs) in Northern Virginia, handling zoning, permits, design, and construction. Services cover basement conversions, garage conversions, and detached cottages. Costs range from $275–$400+ per sq... read more
Washington DC is one of the few major American cities where accessory dwelling units (ADUs) are regulated under a comprehensive zoning framework that reflects the District's dense, historic urban character. Since the DC Office of Zoning updated its zoning regulations in 2016 under the Zoning Regulations Rewrite, ADUs have become a more accessible housing option for homeowners. Experienced ADU contractors in Washington DC must be well-versed in these evolving rules to deliver compliant, high-quality builds in one of the nation's most regulated housing markets.
Working with a knowledgeable ADU contractor in Washington DC is essential because the District enforces strict guidelines that vary by zone. The DC Zoning Regulations allow ADUs in most residential zones, including RF, RA, and R zones, but each comes with specific requirements. Key regulatory considerations include:
Professional ADU builders in Washington DC commonly construct several types of accessory dwelling units suited to the District's urban lot sizes and architectural styles. These include:
Hiring a licensed ADU contractor familiar with Washington DC's permitting process can save homeowners significant time and money. The DC Department of Buildings (DOB) oversees building permits, and navigating the application process requires knowledge of the District's specific documentation requirements. Contractors experienced in DC also understand the nuances of working in historic preservation zones, coordinating with the State Historic Preservation Office (SHPO), and meeting the District's green building standards under the DC Green Building Act.
Whether you're looking to create rental income, house a family member, or increase your property value, working with a qualified ADU contractor in Washington DC is the smartest first step. With the right professional, your ADU project can move smoothly through zoning reviews, permitting, and construction — delivering a compliant, beautiful living space in the heart of the nation's capital.