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Design-build, one in-house team, Fairfax and Loudoun County

Family rooms, media rooms, in-law and guest suites with legal egress, basement bathrooms, wet bars and kitchenettes, gyms and offices, designed, permitted and built by one in-house team, with the moisture work done first. EA Home Design has completed close to 2,000 remodels across Fairfax and Loudoun County since 2009, from a design studio in Sterling.

Updated October 2026

Most basement projects in Northern Virginia start as storage with a furnace in the corner and a single bulb on a pull chain. The family needs a place for the children and their friends, a parent is moving in, the home office has outgrown the dining table, or the house is simply short one bathroom. A finished basement answers all of that without touching the footprint or the yard. The scope below is what we design and build as one job, from the moisture work at the slab to the trim at the stair, in whatever combination the house and the family need.

Every basement is four questions before it is a room. Is it dry: any history of water, efflorescence on the block or a musty smell gets fixed first, with grading and gutters outside, a perimeter drain and sump if the water is chronic, and a vapor retarder on the slab, because a beautiful basement over a damp slab is a short lived basement. Is there headroom: the Virginia Residential Code wants seven feet over the habitable area, with beams, ducts and pipes allowed to drop to six feet four inches, so we measure at the lowest duct before drawing a room, and a main trunk line through the middle of the space forces soffits or a reroute. Where is the drain: a bathroom near an existing rough-in is straightforward, while fixtures that sit below the sewer line need an ejector pump and a cut in the slab. And is there an escape route: a bedroom needs an egress window or door of the code size, with its well, or it cannot be called a bedroom.

Those answers are visible before a dollar is spent, which is why the first visit is a walk of the slab, the walls, the mechanical room and the window wells, not a look at tile samples. The same walk settles the electrical capacity, the radon test, and where the ducts, beams and pipes will be absorbed into the design as soffits and tray details rather than fought. Our basement remodeling ideas guide goes through the rooms a lower level can become, and our basement bedroom guide covers the Virginia code for a legal bedroom in detail.

The Virginia Residential Code sets the test, and it is the same in Fairfax County, Loudoun County and every town between them. The room needs an emergency escape: an egress window with a clear opening of at least 5.7 square feet, or an exterior door, with a window well of at least 9 square feet where the window sits below grade. It needs seven feet of ceiling over the habitable area, at least 70 square feet of floor, heat, smoke and carbon monoxide alarms, and arc fault protection on its circuits. It does not need a closet. A finished basement bedroom is a building permit, with the electrical work on its own permit and the plumbing on another if a bath is included, and the drawing shows the egress size and the well. In Loudoun a home on well and septic has one more gate: the septic system is approved for a set number of bedrooms, so the Health Department has to agree before the bedroom count goes up. We design the egress in, cut and set the well and the window, and book the county inspection that signs it off.

Both counties require a building permit to finish a basement, plus trade permits for the electrical and plumbing, because the work touches framing, wiring and usually water. The City of Fairfax, the City of Falls Church and the Town of Herndon run their own building offices; Vienna addresses are permitted by Fairfax County, and inside the Town of Leesburg a Town zoning permit comes before the Loudoun County building permit. Unpermitted basement work surfaces at resale, when the buyer’s inspector asks for the certificate the county never issued, so every one of ours is permitted and inspected. An in-law suite with its own kitchen and entrance is the most ambitious version of the project and the most valuable, and the rules for a rentable accessory unit vary by county and zoning; we tell you honestly what your property allows before you commit to the layout. Our basement remodel cost guide walks through the permit process in both counties, and our permits and inspections checklist explains what each inspection looks at.

Because the work is below your living space, daily life upstairs carries on largely undisturbed. The crew comes and goes through the basement entrance where there is one, the stair is protected, and dust is controlled at the door. The loud days are the egress cut and any slab work for a bathroom drain, and we tell you which days those are before the schedule is signed. Most basement finishing projects take six to ten weeks of construction; adding a bathroom or a full in-law suite runs longer, and design and county permitting come first. You get both dates in writing before we start.

A basement feels like a basement for three reasons, and all three are design problems. Light: one fixture in the middle of the ceiling cannot do it, so we layer recessed lighting, wall washers on the long walls and task light at the bar and the desk, and we make the most of every window and the walkout wall where there is one. Floors: solid hardwood does not belong below grade, so the floor is a luxury vinyl plank or an engineered product over a proper subfloor that handles the humidity a slab gives off. Ceilings: the ducts and beams are absorbed into soffits, tray details and a ceiling plan that makes the room feel taller than it measures, and where the headroom is tight the trunk line is rerouted rather than boxed. The result should read as a lower level of the house, not a finished cellar.

The walkout colonials of Ashburn and Leesburg are the easiest basements in the region to turn into suites, because the lower level already has daylight, a door to the yard and often a bath rough-in waiting under the slab. The split levels of Springfield and Annandale and the ranches of Vienna and Falls Church put the basement a half level down with window wells on the long walls, which is where the egress for a bedroom goes. In the 1980s and 1990s houses that fill Reston, Herndon, Sterling and Chantilly the questions are usually headroom and ductwork, and those are design questions we answer in 3D before framing starts. We check the slab, the wells and the drain lines on the first visit, because the same floor plan behaves differently in each of them.

We design and build across Fairfax County and Loudoun County from our studio and showroom in Sterling. Home remodeling pages with local detail: Sterling, Leesburg, Chantilly, Middleburg, Bristow, Clifton, Lorton, Springfield, Dunn Loring, Round Hill, Woodbridge and Hamilton. For a lower level planned together with the rest of the house, see whole home remodeling; completed projects with photos and timelines are in our case studies.

One lower level, before and after: the long carpeted room with a projector on the ceiling became the media wall, the kitchenette and the bathroom shown here.

Why homeowners choose EA

Virginia Class A licensed (#2705157182), five-star rated everywhere we are reviewed, with close to 2,000 remodels complete.

I had an exceptional experience working with EA Home Design to redesign my kitchen. From the initial consultation to the final installation, their team demonstrated professionalism and creativity.

Iman, a verified EA Home Design kitchen client

A free in-home design consultation comes first: a designer walks the basement with you, and you see the finished level in 3D with a realistic price for your scope before any commitment.

Fairfax County and Loudoun County, from our Sterling studio.