Fast, Reliable Duct Repair & Sealing Across Calabasas
Duct repair and sealing in Calabasas typically costs $280-$680 for most residential jobs, with same-day service available throughout the 91302 and 91372 ZIP codes. We’re Bellows Air Duct & Vent Co., and we’ve been driving out to Calabasas from our Los Angeles base since 1984 - long enough to know the difference between a Park Estates crawlspace and a The Oaks attic, and why that matters for getting the job done right.
Calabasas homes aren’t like the rest of the Valley. Large custom builds on hillside lots, multi-zone systems with duct runs stretching 40 feet through baking attics, and the lingering effects of the 2018 Woolsey Fire mean generic ductwork doesn’t cut it here. Our Duct Repair & Sealing team arrives with mastic sealant rated for wildfire-ash adhesion, Rotobrush HEPA equipment, and the patience to work in tight spaces where a standard crew would rush. Call (844) 685-6342 and a live person picks up, 24 hours a day. We’ll give you an upfront price before we lift a single tool.
Why Bellows Air Duct & Vent Co. Is Calabasas’s Preferred Duct Repair & Sealing Company
We’ve served Calabasas homeowners for over 42 years, and our reputation here was built on one thing: we return when something’s not right, and we don’t make you fill out paperwork to prove it. Our 90-Day Done Right Promise is stamped on every job - if the seal fails or the smell returns, we come back at no charge. No arguing. No forms.
Calabasas customers call us because we’ve seen what the discount operators miss. A competitor “sealed” a duct system in Mountain View Estates last year with tape that peeled inside of three months because nobody pre-cleaned the ash-coated surface. We fixed it properly with mastic over a HEPA-scrubbed substrate, and it’s holding two years later. That’s the difference between a coupon price and a square deal.
Our response time to Calabasas averages under 90 minutes during business hours. We know the Las Virgenes corridor traffic patterns, which gates require visitor pre-registration at The Oaks, and how to navigate the hillside roads off Mulholland Highway without scratching a truck on tight switchbacks. Background-checked, uniformed technicians on every job. One honest price shown before we start.
Our Duct Repair & Sealing Services in Calabasas
Duct Sealing
Sealing in Calabasas requires more than slapping mastic on a joint. The Santa Ana winds that funnel through the Las Virgenes corridor load outdoor particulates into your HVAC intake year-round, and the 2018 Woolsey Fire left a legacy of baked-on ash in duct walls that prevents proper adhesion. We camera-inspect every run first, HEPA-vacuum contaminated surfaces, then apply professional-grade mastic sealant rated for the temperature swings these hillside attics see. A typical duct sealing job in Calabasas runs $340-$580 for a 2,500-square-foot home, with larger custom properties in Calabasas Park Estates scaling to $720-$950.
Flex Duct Repair
Flex duct in Calabasas takes a beating. Raccoon intrusion from the Santa Monica Mountains is common in homes backing onto open space; we’ve found shredded flex in crawlspaces off Park Granada and Park Oriole more times than we can count. A proper repair means replacing the damaged run with new insulated flex, sealing the entry point with steel mesh so it doesn’t happen again, and pressure-testing the zone. Patch jobs without animal exclusion fail. We don’t do patch jobs. Flex duct repair in Calabasas typically runs $180-$340 per run, with multi-run jobs qualifying for our $50 Off Any Repair Over $250.
Metal Duct Repair
Older metal ductwork in Calabasas homes built during the 1980s and 1990s often suffers from seam separation and corrosion where condensation pools in low spots. The scale of these houses - 4,000, 5,000, 6,000 square feet - means long metal runs with dozens of joints, each a potential leak point. We re-seam with mastic and mechanical fasteners, replace rusted sections with galvanized metal, and verify with before-and-after camera documentation. Metal duct repair in Calabasas ranges from $280 for a localized fix to $680 for extensive re-seaming in a multi-zone system.
Mastic Sealant Application
Mastic is our go-to for Calabasas because it outlasts tape, withstands the thermal cycling of unconditioned hillside attics, and - when applied to a properly cleaned surface - bonds even to duct walls with historical wildfire exposure. We use Abatement Technologies-compatible mastic compounds, applied with brushes and sprayers to ensure full coverage at every joint, boot, and penetration. This isn’t a slapdash operation; a typical Calabasas home requires 3-4 hours of careful application and 24 hours cure time before system restart.
Duct Insulation
Calabasas attics hit 140°F in August. Uninsulated or degraded duct insulation wastes energy and overworks your compressor. We replace torn or compressed insulation with foil-faced fiberglass rated for California Title 24 compliance, paying special attention to flex duct in vented attics where the temperature delta is most severe. Duct insulation work in Calabasas typically runs $420-$780 depending on accessible linear footage.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Calabasas
We stock parts and specify equipment from Nikro, Honeywell, and Aprilaire - the same brands serious HVAC contractors in Los Angeles County rely on for permanent repairs. For Calabasas customers, that means no waiting on a parts run to Van Nuys while your system sits open. Our trucks carry Rotobrush agitation equipment, HEPA vacuums, and mastic compounds matched to the specific contamination profiles we find in 91302 and 91372. If your system uses Aprilaire zoning controls or Honeywell media filters, we know how to integrate sealing work without throwing off your balanced airflow. Most repairs finish in a single visit.
Common Duct Repair & Sealing Problems We See in Calabasas Homes
- Flex-duct tears from raccoon intrusion. Homes backing onto the Santa Monica Mountains, especially in areas near Malibu Creek State Park, frequently have crawlspace flex duct shredded by wildlife. The repair fails if the entry point isn’t sealed with steel mesh - we see this mistake from discount operators regularly in Calabasas.
- Smoke particulates preventing mastic adhesion. Santa Ana wind events bake chaparral smoke and Woolsey Fire ash onto duct walls. Mastic applied over this contamination peels within months. We pre-clean with HEPA vacuum agitation every time. No exceptions.
- Disconnected return-air pathways after remodeling. Calabasas’s frequent high-end renovations - kitchen expansions, additions, whole-house updates - often leave return ducts severed or rerouted incorrectly. The resulting pressure imbalances blow out mastic seals within weeks. We pressure-test the full system before sealing anything.
- Grey-brown ash film in “unaffected” homes. Even properties miles from the Woolsey Fire’s active burn zone pulled sustained smoke plumes through running HVAC systems for days. We find this film coating duct interiors in The Oaks, in Calabasas Park Estates, in Mountain View Estates - everywhere in 91302 and 91372.
We recently repaired a flex-duct run in a 4,200-sq-ft custom home in Calabasas Park Estates. The homeowner had noticed a persistent smoky odor from the vents years after the Woolsey Fire; we found a cracked return-air boot that had allowed ash-laden air to bypass the filter. We sealed the leak with mastic and replaced 18 feet of contaminated flex duct using Rotobrush agitation, restoring air quality.
Pricing for Duct Repair & Sealing in Calabasas, CA
We’re upfront about numbers because nobody likes a surprise on the invoice. Here’s what duct repair and sealing costs in the Calabasas market:
- Duct sealing (typical 2,500 sq ft home): $340-$580
- Duct sealing (large custom home, 4,000+ sq ft): $720-$950
- Flex duct repair (single run, including animal exclusion): $180-$340
- Flex duct repair (multi-run, 3+ runs): $420-$680
- Metal duct repair (localized seam/section): $280-$420
- Metal duct repair (extensive re-seaming, multi-zone): $520-$680
- Mastic sealant application (full system): $380-$620
- Duct insulation replacement: $420-$780
What moves the needle: accessibility (crawlspace vs. walk-in attic), contamination level (light dust vs. heavy ash requiring HEPA pre-cleaning), and system size. We disclose the full price before starting - the number on the phone matches the number on the invoice. Senior and veteran customers receive a permanent 5% discount. Need a second opinion on another company’s written estimate? We’ll review it free. Call (844) 685-6342.
We Also Serve Cities Near Calabasas
Our service radius covers the full western San Fernando Valley and adjacent foothill communities. We regularly run Duct Repair & Sealing in Calabasas and neighboring Woodland Hills, West Hills, Canoga Park, and Agoura. Same trucks, same technicians, same upfront pricing whether you’re off Mulholland or Victory Boulevard.
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
Sealing alone won’t remove existing smoke odor, but it’s essential to prevent recontamination after proper cleaning. We HEPA-vacuum and agitate ash-coated duct walls first, then seal all leaks with mastic so particulates can’t re-enter from attic spaces or wall cavities. The combination eliminates the source and blocks recurrence. Call (844) 685-6342 for a camera inspection - estimates are free.
Every 5-7 years for most Calabasas properties, or sooner if you notice uneven heating, dust surges, or rising energy bills. The 101 Freeway interchange and Santa Ana wind corridor load extra particulates into systems here, accelerating seal degradation compared to inland Valley homes. After any major wildfire event within 20 miles, we recommend a camera inspection regardless of schedule. Our $89 Seasonal Tune-Up includes a basic seal check.
No city permit is required for standard duct repair or sealing in Calabasas, but gated communities often require vendor registration and proof of insurance for technician entry. We’re pre-registered at The Oaks, Calabasas Park Estates, and Mountain View Estates, and our office handles gate clearance when you book. We bring certificates of insurance on every truck. One less thing for you to coordinate.
Metal duct with proper mastic sealing outperforms flex in fire resilience and longevity, though many Calabasas homes use flex for attic runs due to installation ease. If you’re replacing ductwork, we specify galvanized metal for main trunks and high-temperature-rated flex only where flexibility is unavoidable. The critical factor isn’t the material - it’s the quality of sealing and the absence of gaps that could draw smoke during a fire event. We assess your specific layout and recommend accordingly.
Yes. We’ve worked in Calabasas attics with less than 30 inches of clearance at the ridge, navigating around water heaters and HVAC platforms that newer construction crams into every corner. Our technicians carry compact tools and flexible camera equipment specifically for these conditions. We don’t charge extra for tight access - it’s priced into the upfront quote. If we can’t physically reach a duct run, we’ll tell you before we start, not after we’ve torn up your ceiling.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Calabasas since 1984.