Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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After
Before
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Before
AfterFast, Reliable Duct Repair & Sealing Across Chantilly
Duct repair and sealing in Chantilly typically runs $340-$890 for most residential systems, with flex-duct replacement or full trunk sealing at the higher end. We’re usually on-site within two business days of your call, and every job starts with a written price before a single panel comes off. Call (571) 487-7204 to schedule.
Our crews serve Chantilly from our Washington, DC dispatch office, and we know these subdivisions well. The homes off Route 28, around Westfields, and throughout Chantilly Highlands weren’t built with the ductwork you’d see in newer construction. Fiberglass duct board trunks and flex-duct branch runs in attic chases were standard from 1982 through 2005. That material is now 20-40 years old. We’re not guessing - we’ve photographed the delamination, the crushed runs, the failing mastic seals. We show you what the camera found, then we put a written scope and price in front of you before any work starts. Haven Standard Clause 1.
Why CleanRun Air Duct Cleaning Leesburg Is Chantilly’s Preferred Duct Repair & Sealing Company
We’ve been documenting the inside of Chantilly ductwork since 2013. In that time, 52,000+ homes have gone through our process: written price first, camera inspection, work performed, photo record delivered. The 365-Day Done Right Promise backs every job in writing - not a policy that needs manager approval, but a guarantee signed before we leave.
Our technicians are background-checked, uniformed, and identified by name before arrival. Haven Standard Clause 3: Verified Crews. They carry professional-grade equipment from Rotobrush, Abatement Technologies, and Aprilaire - brands you can look up independently before agreeing to anything. Every call is answered by a live person, 24/7, and scheduling to Chantilly is coordinated from our metro office to keep response times predictable.
We also offer a Free Second Opinion on any written estimate. Bring a competitor’s quote; we’ll put our number next to it in writing, no charge. No “call for pricing” - the price is the price, documented before work begins.
Our Duct Repair & Sealing Services in Chantilly
Duct Sealing
Chantilly’s attic-installed duct board trunks lose conditioned air through gaps where mastic has dried and cracked over two decades of thermal cycling. Our sealing process starts with a negative-pressure smoke test (we pressurize the system and watch where smoke escapes) to map every leak. We then reseal trunk seams and plenum connections with fresh mastic, and apply foil-backed tape rated for the temperature swings these attics see. A typical duct sealing job in Chantilly runs $340-$580 for a single-system home.
Flex Duct Repair
Flex-duct branch runs in Chantilly attic chases get crushed by storage boxes, damaged by rodent activity, or simply sag where support straps have failed. In Poplar Tree Estates, our tech pulled a return plenum packed with drywall dust from a nearby Route 28 build-out; camera inspection showed a crushed flex run behind the second-floor chase and delaminated duct board in the attic trunk. We sealed the trunk with mastic, replaced the crushed flex run, and wrapped the exposed attic duct - the system stopped short-cycling and supply registers at the primary bedroom finally hit temperature. Flex-duct repair or replacement in Chantilly typically costs $180-$420 per run, depending on length and attic access.
Metal Duct Repair
Some Chantilly homes, particularly earlier builds in the 1982-1990 range and certain custom construction, used galvanized steel trunk lines. These corrode at seams and can separate where original sealant has failed. We repair with proper sheet-metal patching, reseal with mastic, and insulate where the original wrap has degraded. Metal duct repair in Chantilly runs $280-$650 depending on accessibility and extent of corrosion.
Duct Insulation & Mastic Sealant
Northern Virginia’s humid subtropical summers push indoor relative humidity into ranges where condensation forms on uninsulated or poorly-sealed flex duct runs. This is a persistent problem in Chantilly attic installations where temperature swings between air-conditioned interiors and 130°F attic air create moisture cycling that promotes mold inside duct sections. We wrap exposed runs with formaldehyde-free insulation and seal every seam with mastic rated for the application. Mastic sealant work as part of a larger sealing scope typically adds $120-$240 to the base job.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Before
AfterTrusted Brands We Service in Chantilly
Our trucks stock parts and materials from Abatement Technologies, Aprilaire, and Guardsman - professional-grade products we name so you can verify specifications before agreeing to a price. We don’t show up hoping to source materials; we arrive with what Chantilly’s duct systems typically need. That means faster turnaround, fewer return visits, and a job that moves from inspection to completion in a single day for most residential systems.
Common Duct Repair & Sealing Problems We See in Chantilly Homes
- Delaminated fiberglass duct board trunks. The liner itself is failing in Chantilly’s 1980s-2000s subdivisions, so cleaning alone doesn’t fix airflow or microbial growth. We photograph the deterioration and present repair options with the evidence in front of you.
- Disconnected or crushed flex-duct branch runs in attic chases. Often found only during camera inspection after a clean, these leaks lose conditioned air into a 130°F attic. The homeowner’s complaint is usually “the second floor never cools” - the fix is mechanical, not more refrigerant.
- Construction particulate from the Route 28 / Dulles corridor clogging return plenums and filters. Homes near active development zones pull drywall and concrete dust into returns, masking leak-and-seal needs behind what looks like a simple dirty-duct problem. We separate the two issues and address each with its own scope.
- Failed original mastic at plenum connections. Twenty years of expansion and contraction opens gaps at the highest-stress joints. Smoke testing finds them; fresh mastic and proper mechanical fastening fixes them.
Pricing for Duct Repair & Sealing in Chantilly, VA
Here’s what duct repair and sealing actually costs in the Chantilly market, based on jobs we’ve completed in Chantilly Highlands, Poplar Tree Estates, and the Westfields-adjacent communities:
| Service | Typical Range in Chantilly |
|---|---|
| Duct sealing (single system, mastic + tape) | $340 - $580 |
| Flex duct repair / replacement (per run) | $180 - $420 |
| Metal duct repair (patching + resealing) | $280 - $650 |
| Full trunk replacement (duct board) | $890 - $1,400 |
| Duct insulation wrap (per exposed run) | $120 - $240 |
What moves a job toward the higher end: attic accessibility (steep roof pitch, limited scuttle), number of duct runs affected, and whether we discover additional damage during camera inspection. What we don’t do: quote a low per-vent teaser and multiply it on arrival. Haven Standard Clause 1 means one flat price per system, agreed in writing before work starts. Estimates are free. Call (571) 487-7204 for an exact quote on your system.
We Also Serve Cities Near Chantilly
Our Duct Repair & Sealing crews work throughout Northern Virginia, including Chantilly and the surrounding communities of Centreville, Reston, Herndon, and Sterling. Scheduling and dispatch are coordinated from our Washington, DC office to keep response times consistent across the service area.
Serving Chantilly, VA - Our Local Coverage Area
We’re based in the Chantilly area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Duct Repair & Sealing in Chantilly
Probably not, and we’ll show you why. In Chantilly’s 1990s subdivisions, we regularly open duct board trunks and find the fiberglass liner has delaminated - the surface is failing, not just dirty. Cleaning removes debris but doesn’t restore structural integrity or seal failing mastic. When our camera shows delamination, we present repair options with the photo evidence. Call (571) 487-7204 for an inspection and written scope.
The Route 28 corridor and Dulles Airport surroundings remain among the most actively developed commercial zones in Northern Virginia, continuously pushing construction particulate into the air that these aging systems pull into homes. We routinely find return-air filters and plenums clogged with drywall and concrete dust from nearby build-outs, not just household debris. Homes here often need duct evaluation on a shorter cycle than comparable DC-suburb homes because of what’s in the outdoor air. Call (571) 487-7204 to schedule.
The camera shows a flattened or separated duct section, often hidden behind insulation or at a tight bend in the attic chase. Airflow at the register drops to a trickle, or the room never reaches set temperature despite the system running continuously. We photograph the damage, then present repair options with the image in front of you. Flex-duct replacement typically runs $180-$420 per run in Chantilly. Call (571) 487-7204 for an exact quote.
Yes. Northern Virginia’s cooling season runs May through October and heating from November through March, so systems operate almost year-round. That continuous airflow pulls more particulate through leaks, and the humidity drives condensation on uninsulated attic runs. Sealed, insulated ducts reduce the load on your equipment and cut the moisture that promotes microbial growth inside the system. Call (571) 487-7204 for a smoke-test inspection and written price.
In most cases, yes. The majority of Chantilly’s duct leaks occur at accessible points: attic trunk seams, plenum connections, and exposed flex runs. We reach these through attic scuttles and basement utility chases without wall demolition. Only when ductwork was installed inside finished wall cavities (uncommon in this area’s standard construction) would access become invasive, and we’d flag that in writing before any work. Call (571) 487-7204 to discuss your home’s layout.
Ready to see what’s actually inside your ductwork? Call (571) 487-7204 for a free estimate. We’ll put a written price in front of you before any work starts, document every duct run with before-and-after photos, and back the job with our 365-Day Done Right Promise - in writing, on every visit, no exceptions.
Written by Tomas Reyes, Owner at CleanRun Duct Repair & Cleaning, serving Chantilly since 2013.