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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Thomas Custom Builders designs & builds ADUs in Virginia, including detached units & in-law suites. Ideal for multigenerational living, rental income, or added property value. Experienced ADU contractor handling full construction, code com... 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
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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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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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
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
UP Craftsmen is a licensed ADU builder in Montgomery County, MD, specializing in accessory dwelling units, home additions, and remodeling. They offer Home, Professional, and Studio Series ADUs, plus full construction services. MHIC License #015138... read more
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 zonin... 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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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
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
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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Glickman Design Build offers full-service ADU design and construction, including detached ADUs, granny flats, in-law suites & basement conversions. They handle permits, sustainable building, multigenerational layouts, remodeling, and rental in... read more
Alexandria, Virginia, is a city defined by its rich colonial heritage, cobblestone streets, and the iconic Old Town Historic District. This unique character means that ADU contractors in Alexandria must navigate a building landscape unlike almost anywhere else in Northern Virginia. With much of the city falling under the jurisdiction of the Board of Architectural Review (BAR), contractors constructing accessory dwelling units here need specialized knowledge of historic preservation guidelines alongside standard construction expertise. This blend of old-world charm and modern housing needs makes Alexandria a distinctive market for ADU development.
The City of Alexandria permits accessory dwelling units under specific zoning ordinances that dictate lot size, setback requirements, and maximum square footage. Experienced ADU contractors in Alexandria understand that properties located within the Old and Historic Alexandria District or the Parker-Gray Historic District require additional review from the BAR before any construction permit is issued. This process ensures that new structures, including detached ADUs or converted garages, maintain architectural consistency with the surrounding historic fabric of the neighborhood.
Outside the historic overlay districts, contractors still must comply with the city's Department of Planning and Zoning regulations, which govern:
Alexandria's housing stock includes a mix of row houses, single-family colonial-era homes, and mid-century properties, each presenting different structural challenges for ADU conversions. A contractor unfamiliar with the city's permitting process may face delays when working on properties near the waterfront or within flood zone overlays designated by FEMA, which require additional engineering considerations. Local ADU contractors who regularly work with Alexandria's Planning and Zoning Department tend to have established relationships that streamline plan reviews and inspections.
Additionally, Alexandria's commitment to affordable housing initiatives has placed growing emphasis on ADUs as a tool for increasing housing density without altering neighborhood character. The city has shown interest in encouraging secondary units as a response to rising housing costs, making this an opportune time for homeowners to explore ADU construction with contractors who understand both the regulatory environment and the community's preservation values.
Homeowners considering an ADU project in Alexandria should prioritize contractors with demonstrated experience in the local permitting ecosystem. Essential steps typically include:
Given Alexandria's layered regulatory requirements, partnering with a knowledgeable local contractor is essential for a smooth, compliant ADU build that respects both modern needs and the city's storied architectural legacy.