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
AfterHow Much Does Duct Repair & Sealing Cost in Leesburg, VA?
Our Duct Repair & Sealing services in Leesburg, VA typically cost between $350 and $1,200 for most single-family homes, with the average job landing around $600-$750 when a technician addresses three to six problem areas. Larger homes in Lansdowne or Woodlea Manor with two-zone HVAC systems or finished-basement ductwork can push totals to $1,500 or more, depending on access and the extent of deterioration found during inspection.
If you want the full picture of what this service includes before you see a price, our Duct Repair & Sealing in Leesburg page walks through the process, what the camera typically finds, and what the written quote covers.
—
Duct Repair & Sealing Cost Breakdown (2026)
Every CleanRun quote is written before any panel comes off – Haven Standard Clause 1, no exceptions. The table below reflects actual price ranges we see in the Leesburg market as of 2026. Your final number depends on what the camera finds, not what we assume from a square-footage estimate.
| Service Item | Typical Price Range | Notes |
|---|---|---|
| Aeroseal duct sealing (whole system) | $1,200 – $2,200 | Pressurized aerosol seals leaks from inside; includes pre/post leakage report |
| Mastic sealant application (per section) | $85 – $180 per section | Applied by hand at joints, elbows, and seams; requires access panel or crawl space entry |
| Foil tape sealing (minor joints) | $45 – $90 per location | UL-181-rated tape; appropriate for small, accessible gaps only |
| Flexible duct replacement (per 8-ft run) | $120 – $240 | Common in Leesburg homes built before 2002; flex duct degenerates faster in attic heat |
| Rigid sheet-metal duct repair (per section) | $200 – $450 | Fabricated on-site; required when a duct run is crushed, disconnected, or perforated |
| Supply or return plenum repair | $250 – $600 | The plenum is the central distribution box – repairs here affect the whole system |
| Insulation wrap on repaired sections | $60 – $140 per section | Required in unconditioned attic or crawl space runs to meet current Loudoun County code |
| Inspection and diagnostic camera scan | $75 – $150 | Credited toward repair cost on most jobs; produces the documented photo record |
| Whole-home repair & sealing package (typical 2,200 sq ft) | $650 – $1,400 | Covers multiple repair points plus full-system mastic or tape sealing |
What Moves the Price Up or Down
The single biggest cost driver is access. A disconnected flex duct run in a finished basement in Greenway Farms adds labor time because the technician is working in a low-clearance mechanical space. The same repair in an unfinished utility room takes half the time. Leesburg’s housing stock is split between colonial-style homes with crawl spaces (older sections near Old Town) and slab-on-grade construction common in the Potomac Crossing and River Creek communities – and those two foundation types produce very different labor costs for the same linear footage of repair.
Severity matters too. A camera scan that shows a single pulled joint at an elbow is a one-hour repair. A scan that finds four disconnected sections, a collapsed flex run in the attic, and failed mastic at the plenum box is a half-day job with materials. That’s why the written quote always follows the inspection – not the square footage.
—
What Affects Duct Repair & Sealing Pricing in Leesburg
- Home age and duct material. Leesburg saw heavy residential construction through the 1990s and early 2000s, and many of those homes used flex duct in attic runs. Flex duct has a 15-25 year functional lifespan – it sags, kinks, and develops micro-tears at the wire coils. By 2026, a 1998-build in Sycamore Hill or Stratford Club may be on its second set of flex runs. Rigid sheet metal costs more per section to repair but lasts the life of the home.
- Number of repair points found during inspection. Pricing scales with documented problem locations, not with assumptions. A diagnostic camera scan through the registers and at accessible duct sections will show exactly how many joints are leaking, crushed, or disconnected. Some homes have one; some have nine. The written quote itemizes every location.
- Attic versus crawl space versus basement access. Loudoun County’s climate means unconditioned attic spaces in Leesburg hit 130°F in July and push duct insulation to its limit. Attic repairs require heat-appropriate protective gear and shorter work windows in summer months, which adds time. Crawl space repairs in older sections near Leesburg’s historic core often involve low clearance and moisture, which affects both labor and material choices.
- Sealing method selected. Aeroseal (a pressurized polymer aerosol process) costs more upfront than mastic applied by hand, but it reaches leaks inside the duct wall that no technician can access manually. For a system with widespread micro-leakage, Aeroseal’s pre-and-post leakage report often justifies the price. For a home with two or three identified joint failures, mastic is the documented, cost-effective fix.
- Insulation requirements under current Loudoun County code. Any duct run in an unconditioned space – attic, crawl space, or exterior wall cavity – must be insulated to the R-value specified in Virginia’s current mechanical code. If a repair exposes or replaces a duct section, the insulation wrap goes back on. That’s not optional, and the cost is included in the written quote before work starts.
- System size and zone count. Leesburg’s larger homes in Lansdowne, River Creek, and the Creeks of Algonkian neighborhoods frequently run two-zone or three-zone HVAC systems. More zones mean more ductwork, more dampers, and more seams – all of which represent potential leak points. A two-zone system in a 3,800-square-foot River Creek home will almost always produce a higher repair total than a single-zone system in a 1,600-square-foot townhome in Tuscarora Village, because there’s simply more duct in the building.
—
Before
AfterSigns Your Leesburg Home Needs Duct Repair
Duct problems in Leesburg tend to show up in predictable patterns. The region’s humidity swings – wet summers, dry winters, and a frost cycle that causes expansion and contraction in attic ductwork – accelerate joint failure and insulation degradation faster than the national average. Here’s what to watch for:
- Rooms that won’t hold temperature. If a second-floor bedroom in your Leesburg home runs five to eight degrees warmer than the thermostat setting, a disconnected or collapsed supply run is often the cause. The air is going somewhere – just not into that room.
- Utility bills that climbed without a clear reason. A 2024 Department of Energy study found that leaky duct systems waste 20-30% of conditioned air before it reaches the register. In a Leesburg home running central air from May through September, that’s a measurable monthly cost on your Dominion Energy bill.
- Dust accumulation at registers shortly after cleaning. If registers are collecting visible dust within days of being wiped, the duct system is pulling unconditioned attic or crawl space air through gaps – and that air carries particulates. A camera scan will show the entry point.
- Audible airflow noise at certain registers. A whistling or rushing sound at a supply register typically means the duct is kinked, partially collapsed, or has a hole redirecting airflow at high velocity through a small gap.
- Musty or earthy odor when the system runs. In Leesburg homes with crawl space ductwork, a failed duct joint pulls ground-level air – and its moisture, mold spores, and soil odors – directly into the living space.
—
How to Save on Duct Repair & Sealing in Leesburg
Get the Camera Scan First
A diagnostic camera scan runs $75-$150 and tells you exactly what needs repair – not what might need repair. Skipping the scan and guessing at problem areas costs more in the long run. At CleanRun, the scan cost is credited toward the repair quote on most jobs, and the images become part of the documented photo record you receive when the job is complete. You see the inside of the duct before we touch it and after we finish.
Pair Duct Sealing with Duct Cleaning
If the camera scan shows both contamination and leakage, scheduling duct cleaning and duct repair in a single visit cuts the mobilization cost in half. A technician who is already inside the system with Rotobrush and Nikro equipment can photograph, clean, and seal in sequence. Two separate visits mean two mobilization charges and two sets of access work.
Request a Free Second Opinion on Any Competitor Quote
Leesburg has no shortage of HVAC and duct companies offering $79 inspection specials that tend to produce large upsell estimates once the technician is in the home. If you’ve received a written estimate from another company, CleanRun will put its own number next to it in writing – at no charge. The comparison is documented, not verbal. Call (571) 487-7204 to schedule a free second opinion.
Prioritize the Highest-Impact Leaks First
If budget is a constraint, the written quote will identify which repair points are producing the most conditioned-air loss. A disconnected joint at the supply plenum – where all conditioned air originates – loses more air per hour than a small gap at a terminal run. Fixing high-impact points first produces measurable utility savings that can offset the cost of addressing secondary repairs in a following season.
Don’t Wait on Flex Duct Failures in the Attic
In Leesburg’s summer heat, a partially collapsed flex run degrades faster once it’s compromised. A $150 repair in October becomes a $400 replacement by August if the duct collapses completely under the weight of accumulated moisture and heat cycles. The written quote is free to request – there’s no cost to knowing what’s there. Call (571) 487-7204 to schedule.
—
The CleanRun Pricing Commitment
Haven Standard Clause 1 is not a marketing line. Every Leesburg homeowner who calls CleanRun gets a written price before any work begins – no verbal estimates, no “we’ll know more once we’re inside,” no post-job surprises. The price in the written quote is the price on the invoice, except in the documented case where the camera reveals a condition materially different from the agreed scope – and if that happens, you get a revised written quote before the crew continues. You decide whether to proceed.
The 365-Day Done Right Promise is written on the job record, not stored in a policy document. If a sealed joint fails within a year, CleanRun comes back and makes it right. That’s not a goodwill gesture – it’s a written commitment on every job.
Background-checked, uniformed technicians under Haven Standard Clause 3 (Verified Crews) are identified by name before they arrive at your Leesburg home. The technician at your door is the technician CleanRun has verified – not a subcontractor sourced that morning.
Equipment on duct repair jobs includes Rotobrush for mechanical agitation, Nikro for negative-pressure extraction (a process that uses suction to pull debris out of the duct system without pushing it into the living space), and Abatement Technologies air filtration during work. These are names you can look up independently before you agree to anything.
—
FAQs – Duct Repair & Sealing Cost in Leesburg, VA
How much does duct sealing cost in Leesburg, VA?
Duct sealing in Leesburg costs between $350 and $1,400 for most homes, depending on the method and number of problem areas. Spot sealing with mastic at two or three joints typically runs $300-$500. Whole-system Aeroseal – which pressurizes the duct network and injects a polymer sealant that bonds to leak edges from the inside – costs $1,200-$2,200 and includes a printed pre-and-post leakage report. Most Leesburg homes in the 2,000-2,800 square foot range land between $600 and $950 for a documented repair-and-seal visit. Call (571) 487-7204 and we’ll give you a written number after the camera scan – not before, and not instead of it.
Is Aeroseal worth the extra cost for a Leesburg home?
Aeroseal is worth considering when a camera scan and pressure test show leakage distributed across many small gaps rather than a few large, accessible ones. In Leesburg homes built between 1995 and 2008 – which make up a significant portion of the Lansdowne, River Creek, and Potomac Crossing inventory – flex duct runs develop micro-perforations at the wire coils that no mastic brush can reach. Aeroseal’s pressurized process reaches those gaps. The pre-and-post report shows the exact percentage of leakage before and after, so the result is documented rather than assumed. For a home with two or three identifiable disconnected joints, mastic is the cost-appropriate choice. For a system losing 25% or more of conditioned air through distributed micro-leaks, Aeroseal pays back in reduced energy costs within two to three Loudoun County cooling seasons.
Can duct repair be done in one visit?
Most single-family duct repair jobs in Leesburg are completed in one visit, typically three to five hours depending on access and scope. A home with two to four accessible repair points and mastic sealing at the identified joints is a same-day job. Whole-system Aeroseal takes two to three hours for pressurization and injection, plus setup and cleanup. The exception is a home with repairs spread across finished basement, attic, and crawl space in the same job – those may require a follow-up visit for the crawl space section. The written quote will tell you what’s realistic before the crew arrives. Call (571) 487-7204 to get a written scope.
Does duct repair require a permit in Leesburg or Loudoun County?
Repair and sealing of existing duct sections generally does not require a permit in Loudoun County. Replacement of a substantial portion of the duct system – particularly if it involves changes to the configuration or total linear footage – may require a mechanical permit under Virginia Uniform Statewide Building Code. CleanRun’s technicians flag permit questions during the inspection phase, before the written quote is issued. If a permit is required, that step is addressed in the scope, not discovered after the job is done. When in doubt, the Loudoun County Department of Building and Development is the authority having jurisdiction, and their current requirements take precedence over any general guidance on this page.
What’s the difference between duct sealing and duct cleaning, and do I need both?
Duct cleaning removes particulate matter – dust, debris, biological material – from inside the duct walls using mechanical agitation (Rotobrush) and negative-pressure extraction (Nikro). Duct sealing closes gaps, cracks, and failed joints in the duct structure itself to stop conditioned air from escaping before it reaches the registers. They address different problems. Some Leesburg homes need one; some need both. The camera scan shows which condition is present. If the scan finds a debris build-up at the first elbow and a disconnected joint in the attic, both are documented in the written quote and handled in the same visit when scope allows. Combining the two in one mobilization is almost always less expensive than two separate visits.
How do I know if the repair actually worked?
Every CleanRun job in Leesburg produces a documented photo record – inside every duct run, before and after, delivered to you as a standard part of the job. You don’t have to take anyone’s word for it. The before photo shows the condition that prompted the repair. The after photo shows the sealed joint, the applied mastic, or the replaced section. For Aeroseal jobs, the printed leakage report shows the measured percentage of air loss before pressurization and after – a numerical result, not a technician’s opinion. The 365-Day Done Right Promise is written on the job record; if the repair doesn’t hold, CleanRun comes back. That’s the documentation-first model CleanRun has operated on since 2013, across more than 52,000 homes served.
—
Why Leesburg Homeowners Ask This Question
The duct repair market in Northern Virginia has a pricing problem, and Leesburg homeowners encounter it regularly. A company advertises a $79 inspection, sends a technician with a shop vac and a flashlight, and produces a $2,400 estimate for “complete duct restoration” without a camera image, a documented scope, or an itemized line-by-line breakdown. The homeowner has no way to evaluate whether the number is reasonable because there’s no documented evidence of what was actually found.
That’s the problem this pricing guide is written to address. Real dollar ranges, documented in writing, tied to specific conditions the camera finds – not a number produced to close a sale.
Tomas Reyes built CleanRun’s pricing model around one premise: the homeowner deserves to know the number before anyone picks up a tool. Haven Standard Clause 1 makes that a written commitment on every job, in every Leesburg neighborhood from Greenway Farms to Old Town to Linden Hill. The estimate is free. The camera scan result is documented. The quote is written. If you decide not to proceed, you still have the photo record of what’s inside your ducts. That’s worth something.
Since 2013, CleanRun has completed duct work in more than 52,000 homes – every one with a written price before work started, every one with a documented photo record when the crew left. Tomas Reyes reviews job records and stands behind the 365-Day Done Right Promise as a written commitment, not a customer service script.
—
Key Takeaways
- Duct repair and sealing in Leesburg, VA costs $350-$1,400 for most homes in 2026, with whole-system Aeroseal running $1,200-$2,200.
- The biggest cost driver is access – crawl space and finished-basement repairs take longer and cost more than open utility room work.
- Leesburg’s 1990s-2000s housing stock is particularly susceptible to flex duct degradation in attic runs, due to the region’s summer heat cycles.
- Every CleanRun quote is written before work begins (Haven Standard Clause 1) and backed by a 365-Day Done Right Promise – in writing on the job record.
- The diagnostic camera scan ($75-$150, credited toward most repair quotes) is the only accurate basis for a Leesburg duct repair estimate – square footage alone is not.
- Combining duct cleaning and duct repair in one visit saves the mobilization cost of a separate visit.
- A free second opinion on any competitor’s written estimate is available – documented in writing, not just verbally.
—
Get a Written Estimate for Duct Repair in Leesburg
If you want to know what duct repair actually costs for your specific home in Leesburg – not a range from a website, but a written number tied to what the camera finds in your ducts – call CleanRun at (571) 487-7204. A live person answers every call. The estimate is free. The written price comes before any work starts. And the 365-Day Done Right Promise is on the job record before the truck leaves your driveway.
For everything this service involves – the process, the equipment, what the camera typically finds, and what happens after the written quote is issued – visit our Duct Repair & Sealing in Leesburg page.
—
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Leesburg, serving Leesburg, VA since 2013.
Pricing reflects the Leesburg market as of 2026. CleanRun Air Duct Cleaning Leesburg offers free estimates – call (571) 487-7204.
What Our Customers Say
"On time, professional, and explained what the readings meant without talking down to me."
- Warren E."The dryer vent was almost completely blocked with lint. They showed me the photograph and I understood immediately why the dryer had been running twice."
- Lucia M."Thorough job on the ducts and the dryer vent. Left the house clean and the paperwork was clear."
- Rafael I.