Fast, Reliable Duct Repair & Sealing Across Hollywood
Duct repair and sealing in Hollywood typically runs $280-$650 for most residential jobs, with same-day service available when you call before noon. Our Duct Repair & Sealing team covers all of Hollywood 90028 and surrounding neighborhoods, and we’ll give you an exact price before any work begins. Call (855) 401-6006 for a free estimate.
We’ve been driving to Hollywood jobs since 1984, and we know the difference between a quick register-boot seal and the kind of full-ceiling work these older buildings actually need. The courtyard apartments along Cahuenga, the bungalow courts tucked behind Franklin, the Art Deco walkups near Gower - we’ve worked in all of them. That matters because Hollywood’s housing stock wasn’t built for forced air. Ductwork got added decades later, often poorly, and the fixes that work in a 1990s tract house won’t cut it here.
Why Bellows Air Duct & Vent Co. of California Is Hollywood’s Preferred Duct Repair & Sealing Company
Hollywood property owners call us back because we show up when we say we will, we explain what we found with a camera so you can see it yourself, and we put one honest price on paper before a tool comes out of the truck. No bait coupons. No price changes at the door.
Our reviews from Hollywood customers mention the same things repeatedly: technicians who know old buildings, no pressure to replace what can be repaired, and the 90-Day Done Right Promise that actually gets honored without paperwork or arguing. We’ve earned a strong local reputation in Hollywood specifically because we don’t treat a 1920s courtyard apartment like a suburban ranch house.
Response time to Hollywood is typically same-day or next-morning from our Los Angeles base. Calls are answered by a live person, 24 hours a day - not a voicemail system, not an app. When a Santa Ana wind event has just driven ash through your joist-bay gaps and your unit is cycling dust, that matters.
Our local knowledge runs deep. We know which Hollywood buildings have asbestos-wrapped original ductwork that requires abatement-protocol handling. We know where the 1970s retrofits left flex duct stapled to lath-and-plaster top plates with no mechanical support. And we know that the pollution shadow of the 101 freeway means your return-air intakes are working harder than equivalent systems in Beverly Hills or the Valley. That context changes how we approach every job.
Our Duct Repair & Sealing Services in Hollywood
Duct Sealing
Duct sealing in Hollywood is rarely a simple matter of caulking a few joints. In 90028’s pre-war buildings, supply ducts were often retrofitted through ceiling voids never designed for HVAC, creating continuous air leakage paths along joist bays. We use mastic sealant and professional-grade materials from Abatement Technologies to seal these channels properly, not just the obvious gaps. A typical duct sealing job in Hollywood runs $340-$580 for a single unit in a courtyard apartment or bungalow court, with larger multi-unit systems ranging higher. Every sealing job includes camera verification before and after.
Flex Duct Repair
Flex duct in Hollywood fails differently than elsewhere. The 1970s-era retrofits used unsupported flex runs through hot attic crawlspaces and lath-and-plaster wall cavities, and decades of vibration plus Santa Ana wind pressure events have left many systems with collapsed sections or disconnected joints. We replace damaged flex duct with properly supported runs rated for the application, and we anchor them so they don’t sag back into the same failure mode. Flex duct repair in Hollywood typically costs $180-$420 per run, depending on accessibility and length.
Metal Duct Repair
Original metal duct in Hollywood is scarce - most metal systems here are galvanized steel from mid-century retrofits or early package-unit installations. We’ve repaired metal ducts with holes from seismic shifting, corrosion at condensate contact points, and impact damage from decades of maintenance work in tight ceiling cavities. Where repair is practical, we patch with matching gauge and seal with mastic. When replacement makes more sense, we explain why and show you the camera footage. Metal duct repair in Hollywood generally runs $250-$550.
Mastic Sealant Application
Mastic is our preferred sealant for Hollywood’s older systems because it remains flexible, fills irregular gaps in lath-and-plaster penetrations, and withstands the thermal cycling these buildings experience. We apply mastic at register boots, joist-bay penetrations, and duct connections where tape has failed or was never installed. For Hollywood properties near the 101 corridor, proper mastic sealing is often the difference between filtered indoor air and continuous soot infiltration. Mastic sealant work typically adds $120-$280 to a sealing job, or can be performed as standalone spot repair.
Duct Insulation
Duct insulation in Hollywood degrades faster than inland locations due to attic heat and, in ground-floor units, moisture from aging plumbing in shared walls. We use insulation materials appropriate for the specific application, including APRILAIRE IAQ-grade products where particle infiltration is a documented problem. Proper re-insulation after sealing prevents condensation, reduces energy loss, and keeps your system from working overtime against the thermal load. Duct insulation in Hollywood runs $200-$480 depending on linear footage and accessibility.
What happens when you call
- 1
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 Hollywood
We carry parts and materials from Rotobrush, APRILAIRE, Abatement Technologies, and Guardsman, which means most Hollywood jobs don’t wait for a parts run. When we’re working a bungalow court near Cahuenga or a courtyard building off Gower, we can complete the repair in a single visit because the truck is stocked for what these buildings actually need. That’s not an accident - it’s 42 years of learning what fails in old Hollywood housing and keeping the right materials on hand.
Common Duct Repair & Sealing Problems We See in Hollywood Homes
- Disconnected flex-duct joints in attic crawlspaces. The 1970s retrofits used unsupported flex duct that pulls apart at connections after decades of thermal cycling. We find these most often after Santa Ana wind events, when pressure changes expose weak joints and airflow drops by half overnight.
- Collapsed metal duct sections in lath-and-plaster walls. Building settling in 1920s courtyard apartments shifts metal duct runs that were wedged into ceiling cavities with no clearance. The resulting creases or separations aren’t visible until camera inspection.
- Mastic sealant failure at register boots from freeway soot accumulation. Decades of particulate infiltration from the 101 corridor degrades sealant and creates a feedback loop - more soot, more degradation, more infiltration. Full re-coat with proper surface prep breaks the cycle.
- Hidden joist-bay debris channels. Supply ducts stapled loosely along top plates create continuous ceiling voids that act as debris highways. A single-unit repair often reveals a scope of work that flat-rate out-of-area pricing never accounts for.
Pricing for Duct Repair & Sealing in Hollywood, CA
| Service | Typical Range in Hollywood |
|---|---|
| Basic duct sealing (single unit, spot work) | $280-$420 |
| Full duct sealing with mastic (including joist-bay penetrations) | $340-$580 |
| Flex duct repair/replacement (per run) | $180-$420 |
| Metal duct repair (patch and seal) | $250-$550 |
| Mastic sealant application (standalone) | $120-$280 |
| Duct insulation replacement | $200-$480 |
| Multi-unit system or full-ceiling joist-bay remediation | $650-$1,200+ |
What drives cost up or down: accessibility (attic crawlspace vs. drop ceiling), extent of hidden joist-bay work, material type, and whether asbestos abatement protocols apply. We disclose the full price before starting. No exceptions. We also 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.
We recently sealed a flex-duct run in a 1936 Spanish Colonial Revival bungalow court near Cahuenga and Franklin. The original retrofit had left the supply trunk hanging loose above the ceiling, and a Santa Ana wind event had driven ash into every joist-bay gap, requiring mastic sealant and re-insulation with APRILAIRE IAQ-grade materials to stop particle infiltration from the 101 freeway corridor. The job took one visit. The owner had been quoted a flat rate over the phone by an out-of-area company that never asked about building age or ceiling type. That quote wouldn’t have covered the actual work.
We Also Serve Cities Near Hollywood
Our service area extends throughout the central Los Angeles basin. We regularly handle Duct Repair & Sealing in Hollywood and nearby Universal City, West Hollywood, Koreatown, and Echo Park. The same building-era expertise applies - these neighborhoods share similar pre-war housing stock, retrofit ductwork challenges, and freeway-corridor air quality issues. If you’re in a bordering area, call and we’ll confirm coverage.
Serving Hollywood, CA - Our Local Coverage Area
We’re based in the Hollywood 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 Hollywood
They were never properly supported. The 1970s retrofits stapled flex duct to lath-and-plaster top plates or left it draped through attic voids without hangers, and decades of vibration plus Santa Ana wind pressure events cause sagging, kinking, and eventual collapse. We replace with properly supported runs anchored to structure, not plaster. Call (855) 401-6006 for a camera inspection - estimates are free.
Your supply ducts were likely stapled loosely along joist bays with unsealed penetrations, creating a continuous debris channel rather than isolated buildup at register boots. This is common in 90028’s pre-war buildings with retrofitted HVAC. The scope surprises homeowners and flat-rate phone quotes alike. We price by what we find, disclosed before work begins, not by a rate card that ignores Hollywood’s building realities. Call for an exact quote.
Yes, when applied comprehensively. Mastic seals the irregular gaps at lath-and-plaster penetrations and joist-bay connections where tape and caulk fail, blocking the infiltration path that carries freeway particulate into your living space. It won’t fix a failed filter or a cracked heat exchanger, but for duct leakage, it’s the right material for the job. We use it on every Hollywood sealing job near the 101 corridor. Call (855) 401-6006 to schedule.
Most are repairable if the damage is localized and the surrounding duct is structurally sound. We patch with matching gauge steel, seal with mastic, and verify with camera. Replacement becomes necessary when corrosion is extensive, multiple sections are compromised, or the original layout is so poorly designed that repair perpetuates a bad system. We’ll show you the footage and give you both options with prices. Call for a free second opinion if you’ve already been told it must be replaced.
Hollywood’s attic heat peaks higher than coastal zones, and many retrofits used insulation not rated for the temperatures or moisture conditions in these ceiling cavities. Ground-floor units in courtyard apartments face additional moisture from aging shared plumbing. We replace with properly specified materials, including APRILAIRE IAQ-grade products where particle infiltration is a factor, and we seal the duct first so insulation doesn’t trap moisture against metal. Call (855) 401-6006 - we’ll diagnose the cause and give you an upfront price.
Ready to fix your ductwork right? Call Bellows Air Duct & Vent Co. of California at (855) 401-6006 for a free estimate on duct repair and sealing in Hollywood. We’ll be there when we say, we’ll show you what we find with a camera, and we’ll put one honest price on paper before we start. Backed by our 90-Day Done Right Promise - no paperwork, no arguing, just fixed.
Written by Roger Castañeda, Owner at Bellows Air Duct & Vent Co. of California, serving Hollywood since 1984.