Ground-floor family rooms, primary-suite additions, and second-story build-ups β engineered, permitted, and built by one in-house crew. Serving Fairfax, Vienna, McLean, Arlington, Springfield and surrounding NoVA communities.
β Licensed VA DPOR Class A contractor Β· β 12+ years, 400+ NoVA projects Β· β Free video estimate in 24 hours
| Type | What's included | Price / sqft |
|---|---|---|
| Ground-floor, basic | Standard finishes, slab or crawl foundation, simple roofline | $150β200 |
| Ground-floor, mid | Better finishes, code-compliant tie-in, roofline matched to the house | $200β280 |
| Ground-floor, high-end | High-end finishes, complex structural tie-in | $280β430 |
| Second-story addition | Structural reinforcement of the level below, stairs β the most complex build | $250β550 |
Pricing reflects current Northern Virginia market rates. For homes built before 1990 we recommend budgeting a 15β20% contingency for hidden conditions. Every addition is quoted individually after an engineering review.
Take a short phone video of the space and send it to us. You'll have an accurate estimate within 24 hours β no visit, no pressure.
We come out, measure, and confirm scope in person. The $100 is fully credited toward your project when you sign with us.
All photos are NWP projects, published with client permission. See the full project gallery β
Typical 2026 Northern Virginia rates: ground-floor additions run $150β430 per sqft depending on finish level and structural complexity; second-story additions run $250β550 per sqft. A 400 sqft family room addition typically lands between $60K and $170K. Every addition is quoted individually after an engineering review.
Plan on 2β4 months for plan review and permits on a larger addition in Fairfax County; Loudoun and Prince William vary. We prepare the drawings, submit the application, and coordinate every inspection so you don't have to.
Yes β we work design-build: drawings, structural engineering, permits, construction, and inspections under one roof, with one crew and one point of contact.
Build an addition for how your family lives, not for resale β industry resale data shows additions recoup a modest share of their cost at sale. If resale value is your main goal, exterior projects like siding and roofing hold value better; we're happy to talk through both since we're also a licensed brokerage.
Chat with us 24/7 (English Β· δΈζ Β· EspaΓ±ol), send photos, and get a ballpark on the spot.
π¬ Chat now at nwp2015.com π 703-485-6378