An addition is the one project where zoning can stop you before design starts. We are a licensed contractor in Virginia (Class A #2705183185) — we pull the permits through Fairfax County Land Development Services, coordinate the licensed trades, and hand you a written line-item scope before demolition starts.
An addition starts with zoning, not construction: setbacks, lot coverage and height limits get reviewed before a building permit is issued, and in some neighborhoods there is a stormwater or historic review on top. Then come the footing and foundation inspections, which have to pass before backfill. This is the longest-lead permit of any project we do, and it is why we start the paperwork while the design is still being drawn.
Your Fairfax permit goes through Fairfax County Land Development Services. We pull it under our license and we hold the inspection schedule — you do not chase inspectors and you do not sign the application.
This one catches people out: the City of Fairfax is an independent city with its own permit office, but a great many “Fairfax” mailing addresses are actually in Fairfax County and go through Land Development Services instead. Which one you are in decides where the permit goes and who inspects the work, so we confirm it before anything is filed.
The area runs from 1950s–1970s ramblers and colonials near the city core to newer subdivisions further out. On the original houses, additions and kitchen expansions are the common projects, and lot coverage is usually the first constraint worth checking.
What's includedA planning range, not a quote. Your written line-item price comes after a free on-site walkthrough. HVAC, electrical and plumbing are performed by licensed trade partners.
A written, line-item scope for your home additions project. No design fee, no obligation.
By submitting you agree United Developers may call or text you about your request, including by autodialed/automated means and AI voice, at the number provided. Consent is not a condition of purchase. Msg/data rates may apply. Reply STOP to opt out.
Our Fairfax crews cover Vienna, Oakton, Chantilly, Centreville and every ZIP in the area — 22030, 22031, 22032, 22033.
Yes. United Developers is a licensed contractor in Virginia (Class A #2705183185) and works throughout Fairfax and Fairfax County, including 22030, 22031, 22032, 22033 and nearby Vienna, Oakton, Chantilly.
We do, under our license, through Fairfax County Land Development Services. An addition starts with zoning, not construction: setbacks, lot coverage and height limits get reviewed before a building permit is issued, and in some neighborhoods there is a stormwater or historic review on top. Then come the footing and foundation inspections, which have to pass before backfill. This is the longest-lead permit of any project we do, and it is why we start the paperwork while the design is still being drawn.
This one catches people out: the City of Fairfax is an independent city with its own permit office, but a great many “Fairfax” mailing addresses are actually in Fairfax County and go through Land Development Services instead. Which one you are in decides where the permit goes and who inspects the work, so we confirm it before anything is filed.
Most Fairfax projects land in the $180 – $340 / sq ft range. That is a planning range for Fairfax County, not a quote — your written price comes after a free on-site walkthrough.
Yes. The walkthrough and the written scope are free and yours to keep whether or not you hire us. There is no design fee and no consultation invoice.
The build is rarely the long part — permitting and zoning review are. Expect the approval phase to run in parallel with final design, and expect us to give you a schedule that names the permit milestone rather than hiding it. We will tell you at the walkthrough if your lot has a setback or coverage problem, because that changes the whole conversation.