Fast, Reliable Duct Repair & Sealing Across Calabasas
Most duct repair in Calabasas runs $180-$650 depending on whether you’re sealing joints, replacing flex runs, or encapsulating fire-damaged liner, and our crew typically completes the work same day. We answer calls live at (855) 401-6006, and we’re usually on-site in Calabasas within two hours. Our technicians know the difference between a 1992 metal trunk in Calabasas Park Estates and the flex-duct systems installed in The Oaks of Calabasas during the 2005 building wave, and we carry the right materials for both.
We’ve been driving the 101 to Calabasas since 1984. Roger Castañeda started this company on the principle that a homeowner should see the problem before paying for the fix. That hasn’t changed. Every Duct Repair & Sealing job we do in Calabasas starts with a camera inspection and ends with a second camera inspection, so you see the ash, the cracks, the leaks, and you see them gone.
Why Bellows Air Duct & Vent Co. of California Is Calabasas’s Preferred Duct Repair & Sealing Company
Calabasas homeowners don’t call us for coupons. They call because their neighbor in 91302 had us seal ductwork after the Woolsey Fire and stopped getting that throat-tight feeling every Santa Ana season. Word travels in gated communities. We’ve earned our reputation one home at a time, and we don’t plan to change that.
Our response time to Calabasas averages under two hours because our Los Angeles-based crews know the Ventura Freeway patterns and the canyon back routes. We don’t make you wait through a weekend for duct sealing when the Santa Ana winds are blowing dust through your living room. Calls are answered by a live person, 24 hours a day. No app. No callback queue.
Roger Castañeda built this company on the K.E.Y.S. values code, and the 90-Day Done Right Promise is stamped on every job. If the seal doesn’t hold, if the leak returns, if the smell persists, we come back. No paperwork. No arguing. That’s been our way for over 42 years.
Our Duct Repair & Sealing Services in Calabasas
Duct Sealing
Calabasas homes from the 1980s and 1990s were built with duct joints sealed by original mastic that has now dried, cracked, and failed. In Calabasas Park Estates, we regularly find 20-30% conditioned air leaking into unconditioned attics before it ever reaches the vent. Our duct sealing service replaces that failed barrier with fresh mastic and mechanical fasteners, tested with a duct blaster so you know the leakage rate before and after. A typical whole-house duct sealing in Calabasas runs $450-$950 for homes under 4,000 square feet.
Flex Duct Repair
The flex duct installed in many Calabasas homes during the 1990s and 2000s has reached end of life. The inner liner tears, the insulation compresses, and the wire helix corrodes in attic heat. We replace flex runs with properly sized new material, sealed at every connection. Most flex duct repairs in Calabasas cost $180-$340 per run, and we complete them in a single visit.
Metal Duct Repair
Older Calabasas homes, especially in neighborhoods built before 1990, rely on galvanized metal trunk lines. These rust at seams, separate at joints, and transmit noise. We repair metal ductwork by cutting out damaged sections, fabricating replacements, and sealing with mastic sealant, not duct tape. Metal duct repair in Calabasas typically runs $280-$550 depending on accessibility and extent of damage.
Duct Insulation
Uninsulated or degraded ductwork in Calabasas attics loses efficiency fast when summer temperatures climb past 110°F in those roof spaces. We install new foil-faced insulation or replace degraded flex duct with properly insulated runs. Duct insulation work in Calabasas generally costs $320-$680 for targeted areas, or $1,200-$2,400 for full attic systems in large homes.
Mastic Sealant Application
This is the work we do most in Calabasas, and it’s the work that matters most for fire-legacy homes. Mastic sealant is a thick, fiber-reinforced compound we brush onto every joint, seam, and penetration. It remains flexible for decades, unlike tape. For homes with embedded Woolsey Fire residue, mastic encapsulates particulates that mechanical cleaning cannot fully dislodge. A typical mastic sealing job in Calabasas runs $380-$720.
Air Leak Repair
Santa Ana winds pressurize Calabasas homes and force unfiltered air through every gap in the duct system. We locate leaks with blower door and duct blaster testing, then repair with permanent methods. Air leak repair in Calabasas typically costs $220-$480 depending on the number of leaks and their accessibility.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Calabasas
We stock parts and materials from Nikro, Honeywell, and Aprilaire, the same brands serious HVAC contractors specify for high-end homes. For Calabasas customers, that means no waiting for special orders on standard components. Our trucks carry Rotobrush agitation equipment and HEPA vacuuming systems so we can complete most jobs without a return trip. When we find a Honeywell zone damper failed or an Aprilaire media filter housing leaking, we fix it then and there.
Common Duct Repair & Sealing Problems We See in Calabasas Homes
- Woolsey Fire smoke residue remains embedded in fiberglass duct liner even after cleaning, causing persistent musty odors and respiratory irritation. Standard vacuuming won’t remove it. Mechanical abrasion followed by mastic encapsulation is the only permanent solution we’ve found in 91302 homes.
- Santa Ana winds drive chaparral dust into unsealed duct joints, negating filter upgrades and recontaminating supply registers within weeks. We see this every fall in homes along the canyon edges. Sealing the duct system is what stops it, not a better filter.
- Original mastic from 1980s-90s construction in Calabasas Park Estates has dried and cracked, allowing conditioned air to leak into unconditioned attics. Homeowners notice rooms that never reach temperature and utility bills that climb every summer. The fix is removal of old material and fresh sealing.
- Multi-zone HVAC systems in large Calabasas homes create longer duct runs with more failure points. A 5,000-square-foot home in The Oaks may have 200+ linear feet of ductwork and a dozen zone dampers. Each joint is a potential leak, and the cumulative effect of small leaks is massive energy waste.
Pricing for Duct Repair & Sealing in Calabasas, CA
We don’t do bait pricing. The number we give on the phone is the number on the invoice, and we disclose it before lifting a single tool.
| Service | Typical Range in Calabasas |
|---|---|
| Single flex duct repair/replacement | $180 - $340 |
| Metal duct section repair | $280 - $550 |
| Air leak detection and sealing (per zone) | $220 - $480 |
| Mastic sealant application (whole house) | $380 - $720 |
| Full duct sealing (typical 3,000 sq ft home) | $450 - $950 |
| Duct insulation (targeted areas) | $320 - $680 |
| Full attic duct insulation (large home) | $1,200 - $2,400 |
What moves the price: accessibility (crawl space vs. walk-in attic), extent of fire damage to liner, number of zones, and whether we need to repair or replace existing hardware. We offer $50 off any repair over $250, a permanent 5% senior and veteran discount, and free second opinions on any written estimate you’ve already received. Estimates are free. Call (855) 401-6006.
Calabasas’s Unique Duct Challenges: Fire, Wind, and Legacy Construction
Calabasas sits directly in the burn scar corridor of the 2018 Woolsey Fire, which scorched tens of thousands of acres immediately surrounding the city and drove smoke, fine ash, and combustion particulates deep into the duct systems of thousands of homes, even those that survived structurally intact. Many Calabasas homeowners replaced their HVAC filters and aired out their homes after the fire but never had ductwork professionally cleaned. A significant portion of the housing stock in 91302 still carries embedded smoke residue and sub-micron ash from 2018 inside the duct walls. Invisible to the homeowner. Detectable immediately by any technician running a scope.
Post-Woolsey Fire, many Calabasas homes in 91302 still harbor embedded combustion particulates in their duct linings that standard cleaning cannot dislodge, requiring mechanical abrasion or mastic sealing to encapsulate residual ash. This isn’t a sales pitch. We’ve scoped ducts in Calabasas where the liner looked clean to the naked eye and the camera revealed gray, fibrous ash packed a quarter-inch deep. The homeowner had lived with it for six years.
The city’s position along the inland edge of the Santa Monica Mountains creates a natural funnel for Santa Ana wind events, which drives not only wildland dust and pollen from surrounding chaparral directly into home air intakes but also accelerates the spread of wildfire smoke. The low-humidity conditions that accompany these events keep fine particulates suspended in the air supply longer before they settle into ductwork linings. Calabasas isn’t a typical suburban Los Angeles community. Its geography makes duct sealing a necessity, not a luxury.
Calabasas is dominated by upscale single-family homes built primarily between the mid-1980s and 2000s in large gated communities like The Oaks of Calabasas and Calabasas Park Estates, with sprawling floor plans of 3,000-6,000+ square feet that often include multi-zone HVAC systems. Longer duct runs, more return air pathways, significantly more surface area for smoke and dust to coat. A 1,200-square-foot tract home in the Valley has maybe 80 linear feet of duct. A home in The Oaks might have 250. The math on leakage and contamination isn’t complicated.
In The Oaks of Calabasas, we tackled a 4,500-square-foot home where the original metal ductwork from 1992 had never been sealed. Our crew used Rotobrush agitation with HEPA vacuuming to extract a half-inch of fine ash from the last decade, then applied mastic sealant to every joint to prevent reinfiltration of wildfire particulates. The homeowner’s daughter had been complaining of headaches every fall. They stopped after we finished. We can’t promise that for everyone. But we can promise to show you what your ducts look like before we start and after we finish.
We Also Serve Cities Near Calabasas
Our crews work daily in Woodland Hills, West Hills, Las Flores, and Topanga. If you’re near the Calabasas border, we’ll still answer within two hours. Duct Repair & Sealing in Calabasas is our home territory, but we don’t stop at the city line.
Serving Calabasas, CA - Our Local Coverage Area
We’re based in the Calabasas 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 Calabasas
Embedded Woolsey Fire residue in fiberglass duct liner releases odor particles every time air flows across it, and standard cleaning doesn’t reach the pores of that material. Mechanical abrasion or mastic sealant encapsulation is required to stop the off-gassing. Call (855) 401-6006 for a camera inspection - estimates are free.
We recommend inspection every three years in Calabasas, and every two years if your home is on the canyon edge or was built before 1995. Santa Ana winds accelerate joint failure by pressurizing the system with dust that acts as an abrasive. Call (855) 401-6006 to schedule - we’ll show you the current condition on camera.
Yes. The 2018 Woolsey Fire didn’t respect property lines or construction dates, and Santa Ana winds have deposited fresh chaparral dust annually since. Newer homes often have tighter building envelopes, which actually increases the pressure differential pulling contaminants into any unsealed joint. Call (855) 401-6006 and we’ll scope it.
Yes. A typical unsealed multi-zone system in a 4,000+ square foot Calabasas home loses 25-40% of conditioned air to leakage. Sealing to industry standards typically reduces that to under 10%, which means zones reach temperature faster, equipment cycles less, and utility bills drop measurably. Call (855) 401-6006 for a duct blaster test and exact numbers for your home.
Mastic sealant is a thick, brush-applied compound that remains flexible for decades and is rated for the temperature swings in Calabasas attics. Duct tape dries out, delaminates, and fails within months to a few years. We use mastic on every job, and we warranty the seal for 90 days minimum under our Done Right Promise. Call (855) 401-6006 for an estimate.
Schedule Your Free Duct Inspection in Calabasas
We’ll be there when we say. One honest price, shown before we start. Camera inspection before and after. And if it’s not done right, we make it right for 90 days, no paperwork, no arguing. That’s how Roger Castañeda built this company in 1984, and that’s how we still operate. Call (855) 401-6006 for your free estimate in Calabasas.
Written by Roger Castañeda, Owner at Bellows Air Duct & Vent Co. of California, serving Calabasas since 1984.