How Much Does Duct Repair & Sealing Cost in Los Angeles?
Duct repair and sealing in Los Angeles typically costs between $350 and $1,200 for a standard single-family home, with most jobs landing around $500 to $750 when the problem is caught before it compounds. Aerosol-based sealing systems like Aeroseal run higher – usually $1,000 to $2,500 depending on system size – but they address leakage throughout the entire duct network in a single visit. If you’re getting a quote outside those ranges without a clear explanation, ask why.
At Bellows Air Duct & Vent Co., we’ve been doing this work across Los Angeles since 1984. The numbers above reflect what we actually see on jobs here – not national averages padded with disclaimers.
Duct Repair & Sealing Cost Breakdown (2026)
Below are the typical price ranges we see on residential duct repair and sealing jobs in the Los Angeles market. These reflect real conditions in the area: older homes in neighborhoods like Silver Lake or West Adams with original flex duct, newer construction in the South Bay with longer duct runs, and the crawlspace and attic access challenges common throughout the San Fernando Valley and East LA.
| Service | Typical LA Cost Range | Notes |
|---|---|---|
| Minor duct repair (1-3 sections, accessible) | $150 – $350 | Loose connections, small tears in accessible areas |
| Moderate duct repair (multiple sections) | $350 – $750 | Flex duct replacement, collapsed sections, attic runs |
| Mastic sealant application (whole system) | $400 – $900 | Manual brush-applied sealing at joints and transitions |
| Aeroseal duct sealing | $1,000 – $2,500 | Pressurized aerosol that seals leaks from inside the duct |
| Full duct replacement (partial) | $800 – $2,000 | Heavily damaged runs, often attic or crawlspace work |
| Camera inspection (standalone) | $100 – $200 | At Bellows, camera inspection is included with every job |
| Duct sealing + air duct cleaning (combined) | $600 – $1,400 | Most common combination for homes over 15 years old |
A few things push costs up in the Los Angeles market specifically. Homes built before 1980 – and there are a lot of them in neighborhoods like Echo Park, Boyle Heights, and Leimert Park – tend to have older rigid ductwork or early-generation flex duct that deteriorates differently than modern materials. Attic access in bungalows and Spanish-style homes can be tight, which adds labor time. And because Los Angeles homes run their HVAC systems year-round due to the climate, ducts here accumulate damage faster than in regions with shorter cooling seasons.
If your quote comes in under $200 for a “whole system seal,” read it carefully. That’s a common bait price that gets revised once a technician is on site. Our promise is simple: one honest price, shown before we start. The number on the phone is the number on the invoice.
Current offer: Bellows takes $50 Off Any Repair Over $250, and seniors and veterans receive a permanent 5% discount on all services. Ask about both when you call.
What Affects Duct Repair & Sealing Pricing in Los Angeles
- Duct material and age. Flex duct installed before the mid-1990s tends to degrade at the inner liner, which means repairs are more involved than simply sealing a joint. Homes in older LA neighborhoods often have a mix of materials that weren’t designed to work together, which takes more time to assess and address properly.
- Access and location of damage. A leaking joint at a return air plenum in an open garage is a straightforward fix. The same leak buried in a crawlspace under a Mid-City bungalow or tucked behind a wall in a Koreatown apartment building is a different conversation. Tight access adds labor, plain and simple.
- Extent of leakage. A single disconnected section is priced by the section. Widespread leakage throughout the system – which is common in homes that haven’t had duct service in 10 or more years – may call for aerosol-based sealing or a more systematic mastic application, both of which cost more but address the full problem rather than patching it in pieces.
- System size and number of zones. Larger homes in areas like Encino or Brentwood often have multi-zone HVAC systems with longer duct runs and more potential failure points. More duct means more material and more labor to inspect, seal, and verify.
- LA’s climate demands. Los Angeles runs HVAC longer than almost any other major market. Air conditioning from May through October is normal, and heating isn’t uncommon December through February. That means ducts cycle through more thermal expansion and contraction than ducts in moderate climates, and joints that were marginal five years ago are often failing today. This is especially common on attic duct runs, where temperatures can exceed 130 degrees in summer.
- Whether repair is combined with cleaning. We regularly recommend doing a duct cleaning before sealing, particularly in homes where the ductwork hasn’t been serviced in many years. Sealing a dirty system traps contaminants inside. Combining the two services in one visit keeps costs lower than scheduling them separately – and it’s a single day of access for you.
How to Save on Duct Repair & Sealing
The most reliable way to keep costs down is to catch problems early. A small tear in flex duct or a loose joint at a register box is a minor repair today and a collapsed section or mold-hospitable environment tomorrow, particularly in the humid microclimates near the coast in areas like Mar Vista or El Segundo. If your energy bills have crept up over the past couple of years without an obvious cause, or if certain rooms never seem to reach the temperature on your thermostat, those are early signs worth investigating.
Get a camera inspection before agreeing to any scope of work. At Bellows, we camera-inspect every job before we start and again when we’re done. That before-and-after record tells you exactly what was wrong, exactly what was fixed, and gives you a baseline for future service. A company that quotes a repair without looking inside the duct first is guessing – and guessing at your expense.
Combine services when it makes sense. Scheduling duct repair and sealing in the same visit as a duct cleaning saves on trip charges and cuts total time in your home. We’re already there, the system is already open, and doing both at once is more thorough than doing them months apart.
Use the standing offers. Our $50 Off Any Repair Over $250 applies to most duct repair jobs. Seniors and veterans get 5% off permanently, no coupon required. If you’ve received a written estimate from another company, our Free Second Opinion is available at no charge – call us at (844) 685-6342 and we’ll tell you straight whether the scope and price make sense.
Don’t chase the lowest number. In the Los Angeles market, low bids on duct work often mean one of two things: the scope is incomplete, or the price changes once someone is in your attic. We’ve been called back to re-do other companies’ work more times than we can count. A job done right the first time – and backed in writing for 90 days – costs less than a cheap job done twice.
Our $89 Seasonal Tune-Up is a good entry point if you’re not sure what condition your system is in. It includes a full inspection and gives you an honest read on whether repair or sealing makes sense before spending more.
FAQs – Duct Repair & Sealing Cost in Los Angeles
How much does duct sealing cost in Los Angeles in 2026?
Duct sealing in Los Angeles costs between $400 and $2,500 depending on the method and the size of the system. Mastic sealant applied at joints runs $400 to $900 for a whole-home application. Aeroseal – a pressurized aerosol system that seals leaks from inside the duct – runs $1,000 to $2,500 and is typically the better choice when leakage is distributed throughout the system rather than isolated to a few joints. Call (844) 685-6342 for a free estimate specific to your home.
Is it cheaper to repair or replace ductwork in Los Angeles?
Repair is almost always cheaper in the short term – targeted repairs run $150 to $750 compared to $2,000 or more for partial replacement. But if more than 30 to 40 percent of the system is compromised, patching becomes more expensive over time than replacing the affected runs outright. In older Los Angeles homes with original 1970s or early 1980s ductwork, we sometimes find that one repair uncovers another, which is why a camera inspection before quoting any scope matters. We’ll tell you honestly which direction makes more sense for your specific system – not whichever costs more.
Can duct leaks really affect my energy bill that much?
Yes, and the numbers are not small. The EPA estimates that homes with leaky ducts lose 20 to 30 percent of the air the HVAC system moves before it reaches the living space. In a Los Angeles home running air conditioning five to six months a year, that adds up to real money annually. When customers in neighborhoods like Sherman Oaks or Culver City ask us why their bills are high despite a relatively new unit, leaking ducts are the first thing we check.
How long does duct repair and sealing take?
Most residential duct repair and sealing jobs in Los Angeles take two to five hours, and nearly all are completed in a single visit. Aeroseal adds some setup and curing time, so those jobs typically run four to six hours. We’ll give you a realistic time estimate before we start – no guessing, no “it depends how it goes.” Most of our customers in Los Angeles are back to normal routine the same afternoon.
What is the 90-Day Done Right Promise?
It means exactly what it says: if anything we repaired or sealed is not right within 90 days of our visit, we return and make it right at no charge. No paperwork, no argument, no “that wasn’t in the scope.” It’s our commitment in writing, stamped on every job. If a duct joint we sealed is showing air loss within that window, we come back. That’s the standard we’ve held since 1984, and it’s why customers in Los Angeles call us rather than whoever is running a coupon that week.
Do you serve other cities near Los Angeles?
Yes. Bellows serves communities throughout the greater Los Angeles area, including Duct Repair & Sealing in Bell and surrounding cities. If you’re not sure whether we cover your neighborhood, call (844) 685-6342 – a live person answers every call, around the clock.
Ready to Get an Honest Number?
If your home is losing conditioned air to a leaky duct system, every month you wait is money leaving with it. Bellows Air Duct & Vent Co. has been doing this work in Los Angeles since 1984. We camera-inspect before and after, we give you one honest price before a single tool is lifted, and we back the result in writing for 90 days. Our technicians are background-checked and uniformed, and when you call, a live person picks up.
Call (844) 685-6342 for a free estimate. If you have a written quote from another company, bring it – our Free Second Opinion is on the house. Seniors and veterans, your 5% discount applies automatically. And if the repair is over $250, ask about the $50 Off offer when you call.
No pressure. No performance. Just a square deal and a company that stands behind its work. You can also learn more about what we do on our home page.
Pricing reflects the Los Angeles market as of 2026. Written by the team at Bellows Air Duct & Vent Co., serving Los Angeles since 1984. Bellows Air Duct & Vent Co. offers free estimates – call (844) 685-6342.