Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
See the difference
Before
After
Before
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Before
AfterHow Much Does Duct Repair & Sealing Cost in Charleston?
Duct repair and sealing in Charleston typically runs $350 to $1,200 for most residential jobs, with a single accessible leak or disconnected joint landing near $250 to $400 and whole-system sealing with significant damaged-section replacement reaching $1,200 to $2,400. Leaks in unconditioned attic runs cost more to reach and are the most common reason a quote climbs. The written estimate sets the final price, and we give that estimate free.
If you’re here because your energy bill moved without explanation, or because a room never quite cools the way it used to, the ductwork is the right place to look. We run professional-grade equipment, and we repair what we find rather than handing you a referral slip. Charleston Duct Cleaning works on duct systems the same way a specialist works on any other trade: diagnose first, then fix the actual problem.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the line items usually break out in the Charleston market. Ranges assume a typical single-family home; a tight crawlspace or a long attic run shifts the number up rather than down.
| Service | Typical Cost Range | What It Covers |
|---|---|---|
| Leak diagnosis and airflow test | $120 – $250 | Locating leaks, disconnected joints, and pressure loss across the system |
| Single joint repair and mastic seal | $250 – $400 | Reconnecting a separated joint and sealing it properly |
| Section replacement (flex or rigid) | $400 – $850 | Cutting out failed duct and installing new sealed sections |
| Targeted sealing of multiple leaks | $450 – $900 | Mastic and mesh at every accessible leak point |
| Whole-system sealing, accessible runs | $900 – $1,800 | Full leak survey plus sealing across all reachable ductwork |
| Damaged attic or crawlspace run replacement | $800 – $1,600 | Replacing crushed or torn duct in hard-to-reach spaces |
| Full duct repair with cleaning | $1,200 – $2,400 | Repair and sealing combined with full duct cleaning |
| Dryer vent repair and reconnection | $150 – $350 | Fixing crushed or disconnected dryer vent runs |
What drives the price up: ductwork in an unconditioned attic or a low crawlspace, where access takes time before any repair begins. What pulls it down: a system where the leaks are concentrated and reachable, and where sealing at the joints solves the problem without cutting out duct. A crushed flex run behind a knee wall costs more than a loose boot at a register, and no honest estimate pretends otherwise. If the ducts haven’t been cleaned in years, repair and cleaning are often worth doing in one visit because we’re already inside the system.
We don’t publish a diagnostic fee because the estimate is free and the price is set per job by the written estimate. Contact cleaning with rotating brushes and simultaneous HEPA extraction is a separate service from repair, and we’ll tell you plainly which one your ducts actually need.
What Affects Duct Repair & Sealing Pricing in Charleston
- Attic heat and humidity. Charleston summers push attic temperatures high, and duct insulation and flex duct take a beating up there over time. Sealing and insulation failures in the attic are common, and they’re the most expensive runs to reach because the work happens in a hot, confined space.
- Crawlspace access. Many homes in the older parts of Charleston, including downtown and the neighborhoods around the peninsula, have crawlspaces under the house. Duct runs in a low crawlspace take longer to reach, and that access time shows up in the labor line.
- Hurricane-season moisture and mold. When a duct system gets damp, mold and organic growth can take hold inside the lining. That moves the job from repair into repair plus cleaning with containment, which costs more but is the only way to leave the system in good condition.
- System age and duct type. Older rigid metal duct is repairable but sometimes needs fabrication. Flex duct is faster to replace but easier to crush. Knowing which you have changes the estimate.
- Size of the system. A single-zone home with one air handler is a shorter job than a two-story house with multiple zones and long trunk runs. More duct means more survey and more sealing.
- How much is broken vs. leaking. A disconnected joint is a quick fix. A crushed section or a collapsed run means cutting out and replacing, and that’s where the range widens most.
One more local factor: a lot of Charleston homes have been renovated or added onto, and ductwork added later often doesn’t match the original system. We’ve seen new flex runs tapped into older trunks without proper sealing at the connection. That’s the kind of thing that shows up as a hot room or a bill creeping up, and it shows up in the estimate as a small job with a clear fix.
How to Save on Duct Repair & Sealing
You can lower what you spend without lowering the quality of the fix. Here’s what actually works.
- Get the leak survey right the first time. A proper diagnosis finds all the leaks, not just the loudest one. Sealing once across the whole accessible system usually costs less than coming back two or three times for single joints.
- Repair before you upgrade filtration. A Honeywell or Aprilaire filtration upgrade won’t fix a leaking duct. We’re familiar with those product lines, and we’ll tell you that honestly. Do the repair first, then talk filtration if it still makes sense.
- Combine repair with cleaning when the ducts are due. The duct cleaning page has more on what “due” means, but the short version: if we’re already inside the system, doing the cleaning then saves a second visit.
- Ask about the dryer vent while we’re there. A dryer vent check is inexpensive next to a scheduled repair, and a crushed or disconnected vent is a real efficiency and safety problem. It’s one specialist handling three services, and that’s the whole point of using one.
- Book the free estimate. Call (888) 274-9947 and we’ll give you a written estimate before any work starts. That number is where to start, not a surprise bill later.
We answer 24/7, and fast dispatch runs from 7am to 7pm, Sunday through Friday. We’re closed Saturday. If you call outside dispatch hours, we’ll book you into the next opening.
Why Professional Repair and Sealing Beats a Patch Job
Discount duct services often show up with a shop vac and a coupon, clean the accessible sections, and leave. That leaves the leaks in place, and it leaves disconnected joints exactly where they were. Our approach is cleaner air starts inside the ducts, not just the filter. We run Abatement Technologies air scrubbers on site so airborne particulates get captured during the work instead of recirculating into your home, and we use professional-grade Rotobrush contact cleaning and Nikro HEPA extraction, the equipment tier used in commercial and restoration-grade projects.
Then we repair what we find. Sealing is done with the right materials for the duct type, not a strip of tape. If a section is crushed or failed, we replace it rather than seal around the problem. Our technicians have up to 15 years of experience, and that matters when a leak isn’t where the obvious one is. Ducts are often damaged in the place nobody looks, and in Charleston that’s frequently an attic run or a crawlspace joint hidden behind insulation.
If you’re comparing us to other options, the Charleston Duct Cleaning page lays out the three services and how they fit together. For a broader look at what duct and dryer vent work involves across the metro, see our Charleston page. Both are worth a read before you book anything.
Repair or Replace? How to Decide
Duct repair beats duct replacement when the failure is localized: a disconnected joint, a torn section, a leak at a register boot. Repair is the right call far more often than not, and it’s usually a fraction of the cost of a full replacement. Replacement makes sense when the ductworoc itself is degraded across most of the system, when it’s undersized for the equipment, or when it’s been wet long enough that the lining is compromised throughout.
We can usually tell which side of that line you’re on during the diagnostic. If it’s a repair, we do the repair in the same engagement. You don’t get handed a referral and sent back to the phone. That’s the practical difference between renting a cleaner and hiring someone who repairs ducts.
FAQs – Duct Repair & Sealing Cost
How much does duct repair cost in Charleston?
Duct repair in Charleston typically costs $250 to $1,200, depending on how many leaks there are and how hard they are to reach. A single joint repair runs $250 to $400, while sealing across the whole accessible system can reach $900 to $1,800. Call (888) 274-9947 for an exact quote. The estimate is free.
Is duct sealing worth the money?
Yes, when the ducts are actually leaking, and a proper test tells you that before you spend anything. Sealing leaking ducts usually pays back through lower energy bills and hotter or colder rooms finally balancing out. A whole-system seal at $900 to $1,800 is a reasonable spend if it cuts the load on your equipment. Call (888) 274-9947 and we’ll test first.
Can you repair a crushed flex duct, or does it need replacing?
Crushed flex duct is replaced, not repaired, and that’s the honest answer. A crushed run has lost its shape and its airflow, and sealing it won’t restore either. Section replacement typically runs $400 to $850, and attic or crawlspace runs run higher at $800 to $1,600 because of access. Call (888) 274-9947 and we’ll give you the range for your system.
Should I clean my ducts before or after sealing them?
Seal after you clean, in most cases, and doing both in one visit is the cheaper path. Cleaning first gets debris out, then sealing closes the leaks that were letting it in. Full duct repair with cleaning typically runs $1,200 to $2,400. Call (888) 274-9947 to line up both in the same booking.
Can you come today?
Same-day service is often possible. We dispatch from 7am to 7pm, Sunday through Friday, and we’re closed Saturday. Call (888) 274-9947, we answer 24/7, and we’ll tell you the earliest opening and give you a free estimate.
The point of this page is to give you a real number instead of “it depends.” The written estimate sets the final price, and we’ll always tell you whether a repair, a seal, or cleaning is what your ducts actually need. If you’d rather start with the bigger picture, the Charleston service overview and the Charleston Duct Cleaning service page are both worth a few minutes. Then call.
Call (888) 274-9947 for a free estimate on duct repair and sealing in Charleston. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Written by the team at Charleston Duct Cleaning.
Pricing reflects the Charleston market as of 2026. Charleston Duct Cleaning offers free estimates – call (888) 274-9947.
What Our Customers Say
"Job was done well and the house smells better. There was some dust knocked loose around a couple of the registers that I had to wipe down afterward."
- Jerome Jackson"Found a disconnected run in the crawlspace while they were in there and told me about it rather than cleaning around it."
- Craig Sutton"They photographed every return and supply before starting and sent me the file afterward. No upsell to a sanitizing treatment I didn't need."
- Whitney Gallagher