Oztan Studio offers ADU design services in Arlington, VA. ADUs boost property value, enable rental income & multigenerational living. Arlington requires specific zoning, size & parking rules. Costs range from $100K–$300K+.
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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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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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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.
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Halsey Homes builds custom ADUs in Fredericksburg, VA—detached units, in-law suites, granny flats & garage conversions. With 25+ years of experience, voted Best Builder 2025. Expert ADU contractor handling design through completion.
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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.
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Back Creek Builders constructs ADUs and in-law suites in Maryland, handling design, permitting, and build. Project types include garage conversions, detached cottages, and basement suites. Founded by Eric Young and Jason Gelblum, they manage zoning compliance and full construction.
read moreWashington 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.