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.
Before
After
Before
After
Before
AfterFast, Reliable Duct Repair & Sealing Across Leesburg
Duct repair and sealing in Leesburg typically runs $280-$750 for most residential jobs, with full-system sealing on larger Colonial homes reaching $900-$1,400. We dispatch crews to Leesburg daily from our Washington, DC scheduling office, and most repair visits are scheduled within 2-4 business days. Call (571) 487-7204 for a written estimate before any work starts.
We’ve been working in Leesburg since 2013, and the duct problems here aren’t the same as what we see in Ashburn or Sterling. The mix of 2000s-era builder-grade flex duct, hunt-country agricultural particulates, and historic rigid-duct systems in Old Town creates a repair profile that’s specific to this pocket of Loudoun County. Our Duct Repair & Sealing team documents every run with before-and-after photos, and every price is written and agreed before a panel comes off.
Why CleanRun Air Duct Cleaning Leesburg Is Leesburg’s Preferred Duct Repair & Sealing Company
CleanRun has completed documented repair and sealing work in River Creek, Woodlea Manor, Potomac Station, and throughout Old Town Leesburg. Every job carries our 365-Day Done Right Promise in writing, backed by Haven Standard Clause 1: written price before work, every time.
Our technicians are background-checked, uniformed, and identified by name before arrival - Haven Standard Clause 3: Verified Crews. The photo record from every visit shows you what was actually found inside your ductwork, not what someone claims was there.
Scheduling and dispatch for Leesburg are coordinated from our Washington, DC office, with crews serving the area locally. All calls are answered by a live person, 24/7, and we offer a Free Second Opinion on any competitor’s written estimate.
We’ve served over 52,000 homes since 2013. Every one started with a written price and ended with a documented photo record.
Our Duct Repair & Sealing Services in Leesburg
Flex Duct Repair
Leesburg’s dominant housing stock - large Colonials and craftsman homes built during Loudoun County’s 2000s boom - was installed with builder-grade flexible ductwork that’s now 15-20 years old. In River Creek and Woodlea Manor, we regularly find original flex duct crushed behind finished soffits, torn at truss contact points, or collapsed at sharp bends. Our crew replaces damaged sections with insulated flex duct, supports it properly to prevent future crushing, and seals all connections with mastic. Equipment includes Rotobrush and Nikro systems for source removal after repair.
Duct Sealing
Sealing is often the real fix in Leesburg homes where conditioned air is leaking into attics or crawl spaces. The mastic and foil-tape seals on plenum and boot connections - the metal box that distributes air from your handler, and the connection point at each room vent - dry out and fail after 15-20 years. We seal these with fresh mastic and proper mechanical fasteners, then verify with pressure testing. This is particularly critical in Leesburg’s two-story Colonials, where duct runs through unconditioned attic spaces lose efficiency fast if seals are compromised.
Metal Duct Repair
Old Town Leesburg’s pre-WWII and mid-century homes often have original rigid-metal ductwork or converted gravity heating systems with inaccessible runs. These present different challenges: disconnected joints inside walls, rusted sections, and adaptations that don’t meet current airflow requirements. We camera-inspect these systems before quoting any work, so the price reflects what’s actually reachable and what needs replacement versus repair.
Mastic Sealant Application
Mastic is a thick, brush-applied sealant that outlasts tape and is the industry standard for durable duct sealing. In Leesburg, we apply mastic to all plenum joints, boot connections, and repair transitions. The humid summers here accelerate tape adhesive failure, so mastic is the correct specification for long-term performance. We use professional-grade products from trade-recognized manufacturers.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Before
AfterTrusted Brands We Service in Leesburg
Our equipment roster includes Rotobrush, Nikro, Honeywell, and Aprilaire - brands you can look up independently before agreeing to any work. We stock common flex duct sizes, mastic, and mechanical fasteners for Leesburg jobs, which means most repairs don’t wait on parts. For specialized components in older systems, we source through our Washington, DC supply chain with typical turnaround of 24-48 hours. Every tool and material is named on your written scope, so you know exactly what you’re paying for.
Common Duct Repair & Sealing Problems We See in Leesburg Homes
- Crushed original flex duct in 2000s builds. In River Creek and Woodlea Manor, we find builder-installed flex duct from the early-to-mid 2000s that has never been serviced, still holding drywall dust from rapid construction and now crushed flat behind finished basement soffits or torn at truss runs. Airflow at upper-floor registers drops to almost nothing, and the air handler short-cycles from back pressure.
- Failed seals pulling in agricultural particulates. Leesburg sits where Loudoun’s hunt-country farms meet suburban expansion. Duct systems with compromised plenum or boot seals don’t just leak conditioned air out - they pull hay dust, pollen, and horse-related allergens in. The contamination profile here is different from Ashburn or Sterling, and sealing is the fix.
- Humid attic mold accelerating seal degradation. Leesburg’s Piedmont elevation and humid summers create conditions where mold colonizes inside duct runs, particularly in unconditioned attics of large two-story Colonials. Mold breaks down mastic and tape adhesives faster, and the moisture swells flex duct insulation, reducing diameter and airflow.
- Disconnected rigid-duct joints in Old Town homes. Camera inspection of pre-WWII and mid-century systems often reveals joints that have separated inside walls or above plaster ceilings, problems invisible from the register side. These require targeted access and mechanical reconnection, not just sealing.
Pricing for Duct Repair & Sealing in Leesburg, VA
Here are the ranges we see on actual Leesburg jobs, with written prices agreed before work starts:
| Service | Typical Range in Leesburg |
|---|---|
| Single flex duct run repair/replacement | $280-$450 |
| Plenum and boot sealing (partial system) | $350-$600 |
| Full-system mastic sealing, average home | $650-$900 |
| Full-system sealing, large Colonial (3,500+ sq ft) | $900-$1,400 |
| Old Town rigid-duct repair with camera inspection | $400-$750 |
What moves you within these ranges: number of duct runs, accessibility (finished basements and sealed soffits take longer), whether we find collapsed sections requiring replacement versus sealing only, and whether mold remediation is needed before sealing can be effective. Every estimate is free, and every price is written before work begins - Haven Standard Clause 1. Call (571) 487-7204.
We Also Serve Cities Near Leesburg
Our crews work daily across Loudoun and Fairfax counties. If you’re in Ashburn, Sterling, Herndon, or Chantilly, the same documented repair and sealing process applies. Duct Repair & Sealing in Leesburg is our core service area, and we schedule neighboring cities from the same dispatch.
Serving Leesburg, VA - Our Local Coverage Area
We’re based in the Leesburg 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 Leesburg
Leesburg’s housing stock is dominated by homes built during Loudoun County’s 2000s growth boom, now hitting 15-20 years of age - the exact window when builder-grade flex duct begins to fail. Ashburn’s newer construction has fresher materials and often better initial installation standards. The early-2000s rapid builds in River Creek and Woodlea Manor prioritized speed, and we’ve found original flex duct that still holds construction debris and has never been cleaned. Call (571) 487-7204 for a camera inspection and written estimate.
Yes. Leesburg’s position on the Piedmont edge means HVAC systems draw in hay dust, agricultural particulates, and horse-related allergens from surrounding hunt-country farms - a contamination profile we don’t see in more fully suburban communities east along Route 7. When your duct seals are compromised, these particulates get pulled directly into the airflow. Proper sealing stops the infiltration; cleaning alone doesn’t fix the pathway. We document the difference with before-and-after photos of every run.
Yes, though the approach differs from flex duct systems. Old Town’s pre-WWII and mid-century rigid-duct or converted heating systems require camera inspection to locate disconnected joints and assess accessibility. We seal accessible joints with mastic and mechanical fasteners, and we quote any needed repairs in writing before cutting access. Some runs in plaster-and-lath construction require targeted access points that we discuss with you beforehand. Call (571) 487-7204 to schedule a camera inspection.
Cleaning removes debris that’s already inside; sealing prevents new debris from entering and stops conditioned air from escaping. In Leesburg, we often find homes where cleaning was performed but the underlying leaks were never addressed - so hay dust, pollen, and attic particulates recontaminate the system within months. Our standard process evaluates both: we camera-inspect, clean if needed, then seal the leaks that caused the problem. The photo record shows you both steps.
You can’t tell from the register side. A disconnected duct run may still pass some air through wall cavities, so the vent isn’t completely dead - just weak. We use camera inspection to see the full length of each run, and we show you the footage as part of our documented photo record. In Leesburg’s 2000s Colonials, we’ve found runs that appeared merely dirty from the register but were actually crushed flat or disconnected at a boot connection. The camera doesn’t guess. Call (571) 487-7204 to schedule an inspection with written findings.
Ready to see what’s actually inside your ductwork? Call CleanRun Air Duct Cleaning Leesburg at (571) 487-7204 for a free estimate with a written price before any work starts. Every job includes a Documented Photo Record of every duct run and our 365-Day Done Right Promise, backed in writing.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Leesburg, serving Leesburg since 2013.