Basements, additions & ADUs in Northern Virginia
More room for how you live now
Finished basements, home additions and accessory dwelling units. Your designer plans it, you see it in photoreal 3D, and our own crew builds it — permits handled start to finish.
See it in 3D before you build
Tell us about your basement, addition or ADU. A designer comes to you, measures, talks through layout and budget, and starts your photoreal 3D design.
- →Honest budget range at the first visit
- →Scaled, photoreal 3D renders of your space
- →Permits, ordering and scheduling handled
Book your free consultation
Free · No obligation · Northern Virginia, Maryland and DC
2027 basement costs
What your basement budget buys
Finishing a 1,000 sq ft basement in Fairfax, Loudoun or Arlington typically costs $100 to $185 per square foot. Your total depends on rooms, plumbing and finishes.
Typical 1,000 sq ft basement
$75K–$175K+
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Basic open concept
$75K+
Open plan
Includes:
- Open finished space
- Drywall, paint and flooring
- Recessed lighting
- Code-required electrical
-
Mid-range
$115K+
Partitioned rooms
Basic, plus:
- Separate rooms
- Full 3-piece bathroom
- Small wet bar
- Built-in storage
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Custom suite
$175K+
Full lower level
Mid-range, plus:
- Custom millwork
- Home theater
- Legal bedrooms with egress
- Luxury bath
- Stone-top kitchenette
Typical ranges for Northern Virginia. Additions and ADUs are quoted after a site visit — foundations, structure and access vary too much for a flat rate.
Add-ons
Common basement add-ons
Water management, egress and anything with plumbing are the big movers. We plan and price them from the start.
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$20K–$40K
Basement bathroom
A full bath adds plumbing, venting and waterproofing below grade.
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$5K–$15K
Egress window
Required for legal bedrooms. Includes excavation and the window well.
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$15K–$35K
Wet bar or kitchenette
Cabinets, countertop, sink and small appliances.
-
$2.5K–$4K
Panel upgrade to 200 amp
Older homes often need more capacity before new circuits go in.
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Site-quoted
Additions & ADUs
Family rooms, primary suites, second stories and ADUs for family, guests or rental income.
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Included
Permits & inspections
Fairfax, Loudoun and Arlington permits handled as part of planning.
What clients say
“Taylor was a great designer and worked closely with us to get what we had in mind. Once construction began, the team expertly managed the process and schedule. We couldn’t be happier with the results.”
Steve B. · Bathroom · Leesburg
“Taylor took our midcentury modern taste into account and made recommendations that improved how we use the space. She was a true partner throughout planning. We’re really thrilled with the end result!”
Rochelle S. · Bathroom · Fairfax
“I could not be happier with how my kitchen renovation turned out. Taylor helped me turn my ideas into a beautiful design and made sure everything was implemented exactly to specification. I only wish I had done this sooner.”
Michelle D. · Kitchen · Fairfax
How much does it cost to finish a basement?
A 1,000 sq ft basement in Northern Virginia typically runs $100–$185 per square foot: about $75K+ for a basic open concept, $115K+ for a mid-range build with a bathroom and wet bar, and $175K+ for a custom suite.
Do I need an egress window for a basement bedroom?
Yes. A legal bedroom needs code-compliant egress. Expect $5,000–$15,000 including excavation and the window well.
How much does an addition or ADU cost?
Foundations, structure and site access vary too much for a flat rate, so we quote after a site visit. You’ll get an honest range at your free consultation.
Can an ADU earn rental income?
In much of Northern Virginia, yes. Zoning rules vary by county and town, and we help you plan around them from the start.
Do you handle permits?
Yes. Permits, inspections, ordering and trade scheduling are part of planning.
Is the work warrantied?
Yes. We’re licensed and insured, and our work carries a 2-year warranty.
Let’s design your lower level
Book a free consultation. Your designer comes to you, measures, and starts on the 3D design.
Virginia
Fairfax, McLean, Great Falls, Vienna, Oakton, Reston, Herndon, Tysons, Falls Church, Springfield, Burke, Annandale, Centreville, Chantilly, Alexandria, Arlington, Ashburn, Sterling, Leesburg, Manassas, Woodbridge
Maryland
Bethesda, Chevy Chase, Potomac, Rockville, North Bethesda, Kensington, Silver Spring, College Park, Greenbelt, Hyattsville
Washington, DC
Northwest DC, Georgetown, Capitol Hill, Dupont Circle, Foggy Bottom, Tenleytown, Chevy Chase DC