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
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Before
AfterHow Much Does Duct Repair & Sealing Cost in North Hollywood?
Duct repair and sealing in North Hollywood typically runs $350 to $650 for a single obvious repair in accessible ductwork, $650 to $1,200 for a handful of smaller leaks sealed across one system, and $1,200 to $2,800 for widespread repair where failed sections of flexible duct or disconnected joints have to be replaced in an attic or crawlspace. Pricing is set per job by a written estimate, never by a flat rate over the phone, because the real variable is access. A leaking joint ten feet from the air handler is a completely different day of work than the same leak buried under a low attic deck in a 1920s bungalow near the NoHo Arts District.
We’re Onyx Duct Cleaning, an indoor-air-quality specialist. Repair is one of our three core services, which means we identify and fix compromised ductwork rather than cleaning around a problem and hoping it holds. If you’ve just had an HVAC install or an inspection that flagged your ducts, you want a real range before you commit. Here is what the North Hollywood market looks like in 2026.
Key Takeaways
- Most single-point repairs in accessible duct: $350-$650
- Sealing multiple leaks across one system: $650-$1,200
- Replacing collapsed or disconnected flex duct: $1,200-$2,800
- Repair bundled with full Onyx Duct Cleaning of the system saves the cost of a second setup trip
- Free estimates, priced per job, written down before work starts – call (833) 589-9715. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the numbers stack up for a typical North Hollywood home. These are typical ranges for each line item, not a promise on your particular house. The written estimate you get after we’ve actually looked at the system is the number that counts.
| What the work involves | Typical 2026 range |
|---|---|
| Sealing one accessible leaking joint (mastic or foil tape plus sealing compound) | $350-$650 |
| Sealing a handful of leaks across one system (5-8 points, brush-on sealant) | $650-$1,200 |
| Replacing a failed section of flexible duct (single run) | $450-$900 |
| Reconnecting a disconnected duct at a plenum or boot | $400-$850 |
| Repairing multiple collapsed or crushed runs in an attic or crawlspace | $1,200-$2,800 |
| Replacing damaged takeoff boots or register boxes | $180-$450 each |
| Repair plus full-system cleaning in one visit | $900-$2,200 combined |
Three things push cost up in North Hollywood specifically. First, access: a single-story house with an open attic hatch and a clear deck is faster to work in than a low-clearance crawlspace or a flat-roof building where the duct runs sit in tight cavities. Second, the age of the building: a lot of the housing stock here went up in the 1940s through the 1960s, and plenty of it has been through one or more HVAC replacements or small remodels, so you’re often dealing with ductwork that’s been pieced together over decades. Third, whether the repair is the whole job or part of a bigger push – if a system hasn’t been cleaned in years and there’s visible debris, repairing without cleaning first just pushes the debris back through the fix.
What keeps cost down is straightforward: a clear layout, a real attic or crawlspace to work in, and accurate information before the visit about where the leak seems to be and what the air loss looks like from inside the house.
What Affects Duct Repair & Sealing Pricing in North Hollywood
Duct repair isn’t a commodity like a filter change. Two houses that sound the same over the phone can be very different days of work. Here’s what moves the number in this market.
- Access and attic conditions. Ductwork in an open attic with a finished deck is quicker and cheaper to reach. Ductwork in a low crawlspace, a sealed attic cavity, or a flat-roof commercial corridor in parts of the East Valley costs more because the technician has to work carefully and slowly around structure. That labor difference is usually the single biggest factor.
- The system layout and material. Rigid metal duct held together with mastic and mechanical fasteners can often be sealed in place. Older flexible duct that’s crushed, stretched, or held together with tape that’s long since dried out has to be replaced, not just sealed, and that changes the job entirely.
- Local building stock. Homes across North Hollywood range from 1920s bungalows near the NoHo Arts District to postwar tract houses and newer apartment buildings along Lankershim and Burbank Boulevards. A 1920s house may have original ductwork or a retrofit system with plenty of joints to inspect. A newer complex may have one central unit feeding more than one unit, which changes the scope and the access.
- The local climate and dust load. North Hollywood sits in the San Fernando Valley, where summers are dry and hot and the air is dusty. A system runs hard for a long stretch and moves a lot of dust through it. That wear shows up at the joints first, so a system that hasn’t been sealed or cleaned in a decade usually has more than one leak by the time one becomes noticeable.
- Whether repair is combined with cleaning. If a technician is already in the attic with equipment set up, adding a repair there is cheaper than booking repair as a separate visit. If you’re due for cleaning, teaming the two is the sensible move and often the lower combined price.
- Number of leaks and system size. One seeping joint is one price. A system with eight small leaks, a disconnected boot at a rear bedroom register, and a sagging run across the middle of the attic is the higher price. We count and photograph each one.
Can You Fix a Duct Leak the Same Day?
Often, yes. Accessible leaks can frequently be sealed on the same visit we inspect, and small repairs (a joint, a boot, a short run) usually fit in a single dispatch. What we can’t promise is that every job fits a single visit: a collapsed run deep in a low crawlspace, multiple runs that need replacement, or a system where the leak is hiding behind a finished ceiling might need a second scheduling slot. We tell you up front, after the inspection and the free estimate, whether it’s a one-visit job or not.
The system that makes same-day work possible is having the right equipment on the truck. We run Rotobrush contact-cleaning systems and Nikro HEPA vacuum systems on the same service call, so we can dislodge debris at the duct wall, capture what comes out down to 0.3 microns, and then repair the leak in the same visit without pushing contaminated air back through the house. That matters more on a repair job than people realize: the moment you open a duct to fix it, whatever’s inside has a path out.
How Do You Tell If You Need Repair, Not Just Cleaning?
The clearest signs are uneven airflow (some rooms hot and stuffy while others get blasted), whistling or rattling at a register, visible dust trails around a vent cover, higher energy use in the middle of summer without a change in habits, and a smell in a room that doesn’t match the rest of the house. Each of those points to a specific failure: a disconnected joint, a crushed run, a leaking seam, or a boot that’s pulled away from the drywall. Where you see a pattern of them, the problem is the ductwork itself and cleaning alone won’t fix it.
We show you the system, not just the invoice. On inspection we’ll show you photos or video of each leak or break and explain what it costs to fix and why. That’s the whole point of having repair as a standalone service: the alternative is a cleaner who cleans around the problem or an HVAC tech who wants to rebuild the whole system because it’s easier than a targeted repair.
How to Save on Duct Repair & Sealing
The bills in this guide are honest market ranges, and there are real ways to stay at the low end of them. Here’s what actually works:
- Get the repair scheduled with a cleaning. If the system is due for cleaning anyway, combining them avoids a second setup trip and usually lands the job at the lower end of the combined range. If the system is overdue and you’re in the middle of a renovation or have just had an HVAC install, this is the moment to catch it.
- Ask for a photo or video of each leak. A contractor who shows you the actual break in the duct (rather than telling you there’s “a lot going on up there”) keeps the estimate honest and stops scope creep. We photograph every point we plan to touch before the estimate is written.
- Fix small leaks early. A single joint seeping now is a $350-$650 repair. Left until it softens the surrounding duct and pulls more joints apart, it becomes a $1,200-$2,800 replacement. The cheapest duct repair is the one that happens at the first sign.
- Don’t skip the filter conversation. A clogged or incorrectly sized filter forces the system to push against resistance, which is hard on joints and seams. We work with Honeywell and Aprilaire filtration equipment, so we can talk through whether your filter setup is part of the problem, not just hand you a receipt.
- Take the free estimate. Estimates cost nothing and the number is written down before work starts. Call (833) 589-9715 to book one. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday.
What We Do Differently on a Duct Repair Job
Most duct repair in this market is handled by technicians whose truck carries filters, tape, and a shop vac. We come at it from the abatement and restoration side of the trade, where contamination containment isn’t optional. That means the equipment we run is chosen to capture what’s in the duct and what’s disturbed during the repair, not to recirculate it into the room.
Concretely, that shows up three ways. We use Rotobrush contact-cleaning systems to dislodge debris at the duct wall rather than agitating it. We deploy Nikro HEPA vacuum systems to capture particles down to 0.3 microns. And we stock Abatement Technologies filtration equipment, a containment standard borrowed from professional mold and restoration work, on jobs where the repair is opening up a contaminated section. We can also work with your insurer on a dust- or contamination-driven repair if the cause is covered, though coverage decisions are theirs.
We cover all three services under one roof: air duct cleaning, dryer vent cleaning, and air duct repair. A single call covers the most common ventilation problems in a home. It also means we’re not going to tell you to call a third party for the repair after we clean, or hand off a dryer vent fire risk to someone else. The company has been serving this trade since 2013, and the same standard applies across every job.
FAQs – Duct Repair & Sealing Cost
How much does duct repair and sealing cost in North Hollywood?
Most duct repair and sealing jobs in North Hollywood fall between $350 and $1,200, with larger multi-run replacement jobs running $1,200 to $2,800. A single accessible joint seal sits at the low end ($350-$650); sealing several leaks across one system lands in the middle ($650-$1,200). The written estimate sets the final price. Call (833) 589-9715 for a free estimate.
Is it cheaper to repair ductwork or replace it?
Repair is almost always cheaper than replacement for an otherwise sound system. A single joint seal at $350-$650 versus a full system rebuild in the thousands is a comparable gap. Replacement only makes sense when most of the ductwork has failed or is inaccessible to repair, which is uncommon but does happen in older homes here. An on-site inspection tells you which side of that line you’re on. Call (833) 589-9715 to book one.
How much does it cost to seal duct leaks in North Hollywood?
Sealing a handful of accessible leaks across one system typically runs $650-$1,200. A single accessible joint is $350-$650. The range depends on the number of points and how much of the system is reachable in the attic or crawlspace. We photograph and count each point before the estimate. Call (833) 589-9715 for yours.
Can you come today?
Same-day dispatch is often possible. We answer the phone 24/7, and crews dispatch Sunday through Friday, 7am to 7pm. A call outside dispatch hours is booked into the next opening. If you’re ready to schedule, call (833) 589-9715 and we’ll confirm the window.
Do you charge for the estimate?
No. Estimates are free, and the price for the job is set in writing after we’ve inspected the system. We don’t quote over the phone because the number depends on access and how much of the ductwork is compromised. Call (833) 589-9715 to get a free estimate.
How long do duct repairs last?
A properly sealed joint with mastic and mechanical fasteners typically holds for years, often for the life of the duct section. Flex duct replacements last as long as the material does, which is typically 10 to 15 years when installed correctly. The variable is proper installation, not the repair itself. If you’re unsure about your system, book an inspection.
Book a Duct Repair Estimate in North Hollywood
If your airflow has dropped, a room won’t heat or cool, dust keeps showing up at the vents, or you’ve just had something flagged, call (833) 589-9715. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. Estimates are free and the written price is what you pay.
Duct repair and sealing in North Hollywood is what we do, alongside cleaning and dryer vent work. If you want a specialist who can fix the problem in the duct, not just clean around it, this is that call.
Pricing reflects the North Hollywood market as of 2026. Onyx Duct Cleaning offers free estimates – call (833) 589-9715.
Written by the team at Onyx Duct Cleaning, serving North Hollywood since 2013.
What Our Customers Say
"Told me straight that our ducts were in decent shape and didn't need doing every year like the mailer companies claim."
- Jodi Gallagher"My wife's allergies had been bad in this house since we moved in. It's been two months since they did the ducts and it's noticeably better. Not a miracle, but real."
- Bryce Norris"Quoted per system rather than the bait and switch per vent pricing everybody else in town uses. The number I was told on the phone was the number on the invoice."
- Javier Morales