City: big buildings
Of 6,585 City units, 37.8 percent are in buildings of 50 or more units and 53.6 percent are in buildings with more than one unit.
TPO Roofing in Falls Church, VA
The City of Falls Church tells owners they may replace a roof without a permit, but the same page is written for single-family houses and adds that multifamily and commercial rules differ. Most low-slope roofs in the City sit on buildings that are not single-family houses, so the easy sentence often does not apply to the roof you are asking about.
5.0 rated on Google · 60 Google reviews as shown on the profile
(703) 712-1506Call to talk through your roof
Free 15 minutesFree 15-minute phone consultation
Fairfax, VirginiaServing Northern Virginia, DC and Maryland
The permit sentence
Does the City's "replace your roof" line cover a TPO roof on a condominium?
On its page about when a building permit is required, the City says that on a single-family house most routine work needs none, and lists replacing your roof as long as you are not replacing rafters or a major portion of the decking.
The same page closes with a warning: the permit requirements for multifamily and commercial construction differ from the above. It does not say how they differ. A board assuming a membrane re-roof is permit-free is reading a rule written for someone else.
Even for a house, the City lists anything involving ceilings or rafters as needing a permit. The office to call is Code Administration, 703-248-5080.
Who owns the roof
Whose roof is the membrane, where 37.8 percent of units are in 50-unit buildings?
The Census counts homes, not roofs. These are American Community Survey 2024 five-year figures for housing units.
City: few houses
Detached houses are 36.5 percent of units and attached townhouses 9.7 percent.
County side: even more
In the Fairfax County areas with a Falls Church mailing address, 45.0 percent of Seven Corners units and 43.7 percent of Bailey's Crossroads units are in buildings of 50 or more.
Recognise it
What does a TPO roof look like from a window or stairwell, and what gives out first?
TPO is a single-ply thermoplastic sheet, usually white or light gray, with seams joined by hot-air welding. A gray sheet like the one in the photo at the top could also be another single-ply type, so a roofer should confirm it on the roof.
On a large multi-unit building the sheet itself is rarely the first problem. Look at the details instead: wall flashing where the roof meets a stair tower or parapet, the collars around vents and exhaust pipes, the area around each drain, and any rooftop equipment curb.
Drainage matters more than the label. A roof that does not drain is a design question before it is a repair question.
Rules by building type
Who do you ask about a TPO roof on a house, a townhouse or a multi-unit building?
Confirm your exact scope with the office before work is scheduled. This is what the pages said on October 9, 2026.
| What you have | Inside the City | Fairfax County address, Falls Church mailing city |
|---|---|---|
| Single-family house, rear addition or porch top | The "replace your roof" line applies unless rafters or a major portion of the decking are replaced. Call Code Administration, 703-248-5080. | The county lists replacing roof shingles as no permit and roof repairs as permit work. Land Development Services, 703-222-0801. |
| Townhouse | The City page is written for single-family houses, so ask. | Replacing less than 256 square feet (9 boards) of roof plywood needs no permit unless the decking must be fire rated, such as on townhomes. |
| Condominium or apartment building | The City says multifamily requirements differ and gives no detail, so ask. | The county's commercial projects list names roof repairs under permit work and lists replacing less than 100 square feet of roof covering among work without a permit. |
Decide
Patch the seams, recoat, or replace the membrane on a Falls Church low-slope roof?
Repair
Fits when leaks trace to a few details, such as one flashing, one vent collar or a short stretch of seam, and the insulation under it is dry.
Recoat
Fits a roof that is watertight, firmly attached and dry below. It does not suit open seams or wet insulation.
Replace
Fits widespread leaks, repeat repairs, or wet insulation over a large area.
The EPA describes cool roofs as options for the flat or gently sloping roofs typically found on commercial, industrial and office buildings, and says any winter heating penalty is typically offset by summer cooling savings. Our flat roof page and the TPO, EPDM and modified bitumen guide compare the systems.
The call
What should a board or owner have ready for the 15-minute call about a low-slope roof?
The address
The street number decides City or county, so have it exact.
The building type
House, townhouse or multi-unit, and who owns the roof section.
Where water shows
Rooms, ceilings or stairwells, and whether it follows rain.
Old paperwork
Any past roof records, and whether an association must approve the work.
FAQ
Questions about low-slope membranes in Falls Church
Does the City's no-permit roof rule apply to my condo building?
The City's page says its no-permit examples are for a single-family house and that multifamily and commercial requirements differ. It does not spell out the difference, so call Code Administration at 703-248-5080 before scheduling.
Why does the City's page mention rafters when I only want a membrane?
The City says work involving rafters, floors or ceilings needs a permit. Low-slope roofs sometimes need new deck boards or tapered framing to drain, and that is where a membrane job can cross the line.
My building has a Falls Church address on Leesburg Pike. Which office applies?
The City's address page says Leesburg Pike addresses are likely not in the City. If your parcel is in Fairfax County, ask Land Development Services at 703-222-0801.
Is a townhouse roof the same as a condominium roof for permit purposes?
Not on the county's list. It exempts less than 256 square feet of roof plywood for homes, except where fire-rated decking is required, such as townhomes. Condominium buildings fall under the county's commercial list. Confirm yours with the office.
How can I tell if my flat roof is TPO?
Look for a smooth white or light gray sheet with heat-welded seams. Black rubber is usually EPDM, and a dark rolled-asphalt surface is usually modified bitumen. A roofer should confirm it on the roof, because gray sheets can be other types.
What does ponding do to a single-ply membrane?
Water that stays after rain ages the surface faster. If a roof holds water, the fix may be drainage, not only a new sheet.
Will a white membrane raise my winter heating use?
The EPA says the effect in cold climates is typically offset by summer cooling savings.
Nearby
Which neighboring pages cover the next jurisdiction over?
Back to Falls Church for the full permit table, or see Vienna and Annandale next door. Browse all materials, our service areas or about King's Roofing.
Official pages used, checked October 9, 2026:
Talk through the next step
Tell us what building the membrane sits on
Give us the street address, the building type and where water shows inside. We will say which office to ask before anyone is scheduled.
Book a free 15-minute phone consultation
(703) 712-1506
9220 Topaz St, Fairfax, VA 22031
Mon to Fri 7 AM to 8:30 PM, Sat 7 AM to 8 PM, closed Sunday