Whole-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.
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AfterFast, Reliable Air Duct Repair Across Larkspur
Air duct repair in Larkspur typically costs between $350 and $1,400 depending on whether we’re sealing disconnected runs, replacing crushed flex duct, or rebuilding a failed plenum connection. Most repair jobs in Larkspur are completed in one visit, and we’re already familiar with the canyon moisture and older retrofit systems that make this work different here. That’s the honest answer, and it’s what you’ll get from the first phone call to (980) 447-2498. We know Larkspur’s homes, its microclimates, and the exact failure points that show up in Baltimore Canyon and Old Town ductwork year after year.
Why Linden Air Duct Cleaning Is Larkspur’s Preferred Air Duct Repair Company
We’re the Air Duct Repair team Larkspur homeowners call when a standard cleaning uncovers something structural, which happens more often here than almost anywhere else in Marin. The reason is straightforward: Old Town’s 1900s – 1930s bungalows were retrofitted from gravity furnaces, and those conversions left oversized, irregularly routed runs that fail in predictable ways. We see the same disconnected flex runs, the same collapsed bends, the same damp return plenums on job after job. That repetition matters because it means our techs arrive already knowing what to look for.
Every technician who comes to a Larkspur home is background-checked, identity-verified, and introduced to you by name and photo before the visit under the Threshold Standard. When they pull into your driveway on Magnolia Avenue or up a shaded canyon road, they show a photo ID badge at your door. Marcus Veale leads our team with the understanding that a homeowner letting a stranger into the house deserves proof of who that stranger is before the door opens.
Air Duct Replacement in Larkspur
Air Duct Replacement in Larkspur is what we recommend when the existing runs are too far gone to seal and wrap: crushed flex in a canyon crawl space, rusted-out metal in an Old Town gravity-furnace conversion, or duct board that’s absorbed decades of damp and can’t be cleaned. The job involves removing failed sections and installing new sealed, insulated ducting sized correctly for the current air handler, not the 1930s original. In Larkspur, full replacement of a typical single-run repair area runs $500 – $1,400, while whole-system duct replacement in an older bungalow can run higher depending on access and run length.
Crawl Space Run Replacement
Homes on shaded canyon lots in Larkspur frequently have flex duct sitting under the house in damp, tight crawl spaces. When that duct has been crushed by a contractor or pulled apart at a connection, replacement is usually faster and more permanent than patching. The new runs get sealed with mastic at every joint, not tape, which is what holds up in chronic moisture.
Return Plenum Rebuild
Older Larkspur homes often draw return air from crawl spaces that were never sealed for modern forced-air systems. That pulls redwood duff, mold spores, and damp air straight into the system. A rebuilt return plenum with a sealed filter housing changes the entire air path, and it’s one of the repairs that makes the biggest difference in canyon homes.
Ductwork Repair in Larkspur
Ductwork Repair in Larkspur covers the fixes that keep existing runs working: reconnecting separated flex duct, sealing leaky joints and elbow bends, repairing crushed sections, closing off abandoned branch runs from old gravity-furnace layouts, and replacing failed duct hangers in crawl spaces. In Larkspur, most repair jobs land between $350 and $900 per section depending on access, location, and how much material has to be removed. We give you a written price before any work begins, so there’s no guesswork when the van pulls up.
Reconnection and Sealing at Leaky Joints
The most common repair in Larkspur’s older housing stock is a flex duct that has pulled apart at a sheet metal collar, often in a damp crawl space. We reconnect with a proper zip tie and then seal the joint with mastic so the connection can’t wick moisture or shed air again. This is a small repair that changes static pressure dramatically in a system with multiple leaks.
Crushed and Collapsed Run Repair
In tight canyon crawl spaces, duct runs get crushed by stored items, animal activity, or simply decades of sagging on failing hangers. A crushed run can cut airflow to entire rooms, especially in Old Town bungalows where branch runs are already oversized for their modern air handlers. We rebuild the affected section, and where the damage is extensive, we’ll recommend replacement rather than repeated patching.
Trusted Brands We Service in Larkspur
We use professional-grade equipment from Rotobrush and Nikro for source-removal cleaning, and we pair that with sealed repair work and air-quality products from brands like Abatement Technologies and Guardsman where the job calls for it. In Larkspur, that combination matters: a Rotobrush negative-pressure extraction run followed by sealed duct repair fixes the source, not just the symptom. We keep common repair components on our trucks so Larkspur canyon jobs don’t stretch across multiple visits.
Common Air Duct Repair Problems We See in Larkspur Homes
- Disconnected flex duct under canyon crawl spaces. The combination of steep, shaded lots and long runs means ducts get pulled apart by gravity and contractor traffic. This is the number-one repair we perform in Larkspur.
- Crushed or collapsed runs on Old Town gravity-furnace retrofits. Original gravity furnaces moved air through larger, differently routed ductwork. When a modern air handler was bolted in without resizing the ductwork, pressure imbalances and crushed bends showed up within a few seasons.
- Redwood duff and mold packed into return plenums. Damp crawl spaces under the redwood canopy in Baltimore Canyon and Madrone Canyon feed organic debris into leaky return paths. A standard surface clean will not touch this; it takes source-removal extraction and sealed repairs.
- Deteriorated flex duct in shaded crawl spaces. Chronic marine fog and canopy humidity rot the outer liner of flex duct faster than in neighboring flatland cities. Once the liner fails, insulation wicks moisture and the duct loses pressure.
Pricing for Air Duct Repair in Larkspur, CA
You’ll pay a flat price per repair area, not an hourly rate that drifts upward while a tech is under the house. In Larkspur, sealing a leaking connection typically runs $180 – $350, repairing a crushed flex section runs $300 – $700, and rebuilding a return plenum runs $600 – $1,200. Whole-system replacement of older ductwork runs higher, but we’ll always show you the written number before any work begins. For an exact quote on your Larkspur system, call (980) 447-2498 and describe what you’re seeing. If you don’t know what’s wrong, we’ll diagnose it during the visit and give you the price before we begin.
We Also Serve Cities Near Larkspur
Our crews work throughout Marin, and if you’re just over the ridge from Larkspur, we serve Kentfield, Corte Madera, San Rafael, and Mill Valley with the same written-price and verified-tech commitment. If you’re in one of those areas, you can learn more about our local coverage on the Air Duct Repair in Larkspur page or call (980) 447-2498 to confirm your street is in our area.
Serving Larkspur, CA - Our Local Coverage Area
We’re based in the Larkspur 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 About Air Duct Repair in Larkspur
Homes in Larkspur’s canyon neighborhoods sit under dense redwood canopy that holds marine fog and drip moisture against the house year-round, which accelerates flex duct deterioration and feeds microbial growth in return plenums. San Rafael’s flatter, sunnier lots simply don’t create the same persistent damp conditions. A Larkspur canyon home may need a crawl-space duct repaired every decade, while the same system in a San Rafael ranch might go 20 years before disconnecting. Call (980) 447-2498 if you suspect your canyon ducts are failing.
You won’t always know until we get eyes on the system, but some signs point toward repair rather than cleaning alone: rooms that stay cold in winter, visible mold near supply registers, a crawl space with obvious crushed or disconnected flex, or a return that’s pulling air from the dirt floor. During a cleaning, if our tech finds failed connections, collapsed sections, or mold that surface cleaning won’t address, we’ll show you photos and give you a written repair price before touching anything else. That’s the honest way to find out what your ducts actually need.
Yes, and in Larkspur especially. When mold has colonized the insulation liner of flex duct or the inside of a return plenum, no amount of surface cleaning will get it out. The contaminated section has to be removed and replaced, and the crawl-space connections that feed moisture into the system have to be sealed. Cleaning the surface would just be a temporary patch, which is not what we do. We’ll show you what we found and recommend replacement of contaminated sections where that’s the only durable fix.
On an Old Town Larkspur bungalow, repair typically involves sealing abandoned gravity-furnace branch runs, reconnecting flex duct that’s pulled apart, repairing crushed sections, and sealing the return path so it stops drawing damp crawl-space air. In an early-1930s Craftsman we worked on, our tech pulled knotted redwood duff and live mold from the return plenum, found three separate disconnected and crushed flex runs, and sealed the crawl-space connections after source-removal cleaning under negative pressure. That job took one day and restored airflow to rooms that had been cold for years.
Yes, and we do it regularly in Baltimore Canyon, Madrone Canyon, and the shaded lots around Old Town. Crawl spaces in Larkspur’s redwood shade are often tight, damp, and unpleasant to work in, but they’re where the most important repairs happen. Our techs are equipped to work in confined, wet crawl spaces, and we’ll give you a straight answer about what’s down there before starting. Call (980) 447-2498 for a free estimate and we’ll schedule a visit to see what’s actually under your house.
Call Linden Air Duct Cleaning for Air Duct Repair in Larkspur
If you’re in Larkspur and your ducts are leaking, crushed, mold-contaminated, or just not moving air the way they should, call (980) 447-2498. You’ll get a live person on the phone, a written price before any work begins, and a tech whose name and photo you’ll see before they arrive. Every repair is covered by our 365-Day Done Right Promise, and if a covered repair fails, we come back at no charge. That’s how Marcus Veale and the whole team at Linden Air Duct Cleaning have worked since day one. Call today and tell us what’s going on.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving Larkspur homes with verified, accountable air duct repair.