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.
read more
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.
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.
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
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.
read more
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+.
read more
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
Annandale is a well-established, unincorporated community in Fairfax County, Virginia, known for its diverse population and a housing stock largely built from the 1950s through the 1970s. Many homes sit on generously sized lots originally platted for single-family use, which makes them strong candidates for accessory dwelling units. Experienced ADU contractors in Annandale understand how to work within the character of these older neighborhoods while updating properties to meet modern multigenerational living needs, a growing priority given the area's proximity to Washington, D.C. and the high cost of separate housing in Northern Virginia.
Because Annandale falls under Fairfax County jurisdiction, any accessory dwelling unit project must comply with the Fairfax County Zoning Ordinance, which regulates what the county refers to as accessory living units. A qualified ADU contractor in Annandale will be familiar with these county-specific requirements, which include:
Because Annandale includes a mix of zoning districts such as R-2, R-3, and R-4, lot-specific research is essential before design work begins. A contractor who regularly pulls permits in this part of Fairfax County can help homeowners determine which zoning classification applies to their property and what that means for unit size and placement.
All ADU construction in Annandale must go through the Fairfax County Department of Planning and Development, along with building permit review from the Department of Land Development Services. This typically involves submitting site plans, structural drawings, and sometimes a special permit application if the project does not meet standard accessory living unit criteria by-right. Local ADU builders in Annandale who have completed similar projects in Fairfax County can often anticipate review comments, reducing delays and helping homeowners avoid costly redesigns.
Choosing a contractor familiar with Annandale's housing patterns and Fairfax County's permitting system offers real advantages. These professionals understand how older utility connections, mature tree coverage, and established drainage patterns on many Annandale lots can affect ADU placement. They also tend to have working relationships with county inspectors and plan reviewers, which can streamline communication throughout the build.
Homeowners in Annandale pursue several ADU formats depending on lot configuration and budget:
Each option carries different implications for parking, egress, and utility connections, all of which a knowledgeable ADU contractor in Annandale will evaluate against Fairfax County code before construction begins.