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 San Anselmo
If you’ve got torn, disconnected, or flood-damaged ductwork in a San Anselmo home, you need a straight answer: repair typically runs $380 – $1,200 for localized fixes like sealing disconnected joints or replacing a short flex run, while full duct replacement in a crawl space or attic here usually lands between $2,800 and $6,500 depending on access and system size. We’ve worked the crawl spaces under Craftsman bungalows on Tamalpais Avenue and the ranch homes off Red Hill Avenue long enough to know exactly what goes wrong in this valley, and what it takes to fix it right. Our San Anselmo crew arrives with Rotobrush and Nikro equipment, a camera scope for the ducts, and a written price before any work starts. Call (980) 447-2498 and we’ll walk you through it.
Why Linden Air Duct Cleaning Is San Anselmo’s Preferred Air Duct Repair Company
San Anselmo homeowners call us because we show up with proof, not promises. Every technician who comes to your door has passed a background check, carries a photo ID badge, and is introduced to you by name and photo before they arrive. That matters in a town where many people are home alone during the day or have young kids in the house. You know exactly who’s walking up the driveway before they knock.
Marcus Veale leads our team, and he’s built the way we work around one principle: written accountability. Every repair job gets a written price before work begins, and every repair is covered in writing for 365 days. If a covered repair fails, we come back at no charge. That’s not a promotional hook. It’s our standing commitment.
We also answer the phone with a live person, 24 hours a day, seven days a week. No voicemail loops. No “press 1 for service.” If something’s wrong with your ducts at 11 p.m. and you want a real answer, you get one. San Anselmo’s older housing stock gives us plenty to work with, and we’ve learned the specific failure patterns of this valley floor better than any generalist HVAC shop.
Ductwork Repair in San Anselmo
Ductwork Repair in San Anselmo homes most often means reconnecting joints that have separated over decades, sealing leaks at register boots, patching small tears in flex duct, or replacing short sections of rusted rigid galvanized line. In this town, where central heating was retrofitted into 1910s and 1920s homes during the 1950s and 60s, the age alone creates problems: metal straps rust through, duct tape adhesive fails, and joints pull apart as houses settle. A typical localized repair here runs $380 – $1,200 depending on access and how much of the run is affected.
What we check during a repair visit
Before we touch anything, we run a camera through the affected duct to see the full picture. That matters more in San Anselmo than in most places, because the exterior of a run can look fine while the interior holds separated joints, rodent debris, or old flood silt you can’t see from the register. On one job off lower Sir Francis Drake Boulevard, we used a camera inspection through a 1950s retrofit flex run and found it packed with dried creek silt and mold colonies on the liner. The homeowner had no idea. That’s what we’re looking for.
Repair versus replace after water intrusion
If a duct has taken on water from a crawl-space flood, cleaning alone may not be enough. Flex duct liners that were saturated and dried repeatedly tend to delaminate, and that delaminated inner surface will keep shedding particles into your air no matter how thoroughly it’s cleaned. In that situation we document everything with photos and recommend replacement rather than selling you a cleaning that won’t hold. Your insurance company needs documentation, and we generate exactly that: before shots, after shots, and a written assessment of the duct condition.
Duct Replacement in San Anselmo
Duct Replacement in San Anselmo involves removing the failed run, from register boot to trunk line or air handler connection, and installing new flex or rigid duct matched to the system’s airflow needs. Up here, full replacement for a single-family home typically runs $2,800 – $6,500, with the spread driven by crawl-space access, system size, and whether we’re replacing one main trunk or the whole supply and return network. On that Sir Francis Drake job, the supply trunk was salvageable with aggressive source-removal cleaning under negative pressure and HEPA filtration, but the saturated return duct was delaminating and had to go. We logged before and after photos for the homeowner’s flood insurance claim and recommended replacement there, cutting out the contaminated material rather than gambling on a clean that wouldn’t hold.
What gets replaced, and when
We replace flex runs when the inner liner is torn, mold-colonized beyond remediation, or delaminated from moisture. We replace rigid galvanized when rust has eaten pinholes through the metal, or when separation at the joints has made the run impossible to seal. In San Anselmo’s pre-war homes, it’s usually a mix: the original rigid trunk might still be sound fifty years on, while the flex branches added decades later are failing. We don’t sell a full replacement when three feet of flex is the real problem. The camera tells us the difference, and we show you the footage.
Matching new work to an old house
San Anselmo’s bungalows and early ranch homes were never designed for central air, so the retrofit ducting we replace often runs through spaces that were never meant to be crawl spaces. That means low clearances, tight register boots, and runs that snake around old foundations. We’ve done enough of these to know the odd paths, and we install new ductwork with sealed joints and proper support so it survives the next forty years. The written guarantee covers every foot of it for 365 days.
Trusted Brands We Service in San Anselmo
We work on and around the equipment San Anselmo homes actually have: Nikro agitation and negative-pressure systems for source removal, Honeywell and Aprilaire air-quality components, and Abatement Technologies HEPA filtration units when mold or flood debris is a factor. We keep common parts for these brands stocked locally for San Anselmo customers, which means shorter turnaround when a replacement section or filter housing needs to be ordered. If your system carries a less common name, we’ll still assess the ductwork itself, because the ducts are the failure point we’re called to fix.
Common Air Duct Repair Problems We See in San Anselmo Homes
- Flood-silt intrusion from San Anselmo Creek. Homes within a few blocks of the creek, especially along Red Hill Avenue, Tamalpais Avenue, and lower Sir Francis Drake Boulevard, routinely show dried silt packed into crawl-space flex ducts after the 1982, 2005, and 2006 floods. Silt plus moisture equals embedded mold that cleaning alone won’t remove.
- Dampness-driven mold at register boots. The valley’s evening marine fog and cool moist air keep crawl spaces damp well into summer, and that sustained humidity accelerates mold colonization at poorly sealed register boots and disconnected joints. Homes a mile up on the Fairfax ridgeline don’t see nearly the same rate of this problem.
- Disconnected joints in 50 – 70 year old retrofit ductwork. The town’s Craftsman bungalows and early ranch homes had central heat added in the 1950s and 60s, often with flex crammed into low crawl spaces. Those joints fail from age, settlement, and the occasional rodent moving through. A disconnected joint in a crawl space can spill half your conditioned air under the house.
- Compromised rigid galvanized runs behind the air handler. Contractors who skip the camera miss rusted, separated rigid duct behind the furnace, where debris and moisture keep recirculating through the supply. We scope these first, because what you can’t see from the register is usually the actual problem.
Pricing for Air Duct Repair in San Anselmo, CA
A typical Air Duct Repair in San Anselmo for a disconnected joint or short flex replacement runs $380 – $750. More involved work, such as sealing multiple leaking boots or replacing a longer run with poor crawl-space access, lands between $750 and $1,200. Full duct replacement for a single-family home here generally runs $2,800 – $6,500. The biggest cost drivers are how much of the duct is affected and how hard it is to reach under a 1920s foundation. Every quote is put in writing before any work begins, and the price we write is the price you pay. No per-vent pricing games. Call (980) 447-2498 for a free estimate and we’ll give you the real number, not a teaser.
We Also Serve Cities Near San Anselmo
Our crews handle Air Duct Repair work across the Ross Valley. If you’re in Fairfax, Kentfield, San Rafael, or Larkspur, you’ll get the same camera-first inspection, written price, and 365-day written guarantee we offer in San Anselmo. The valley floor flood-silt patterns we describe on this page are specific to San Anselmo and the immediate creek corridor, but the repair standards are the same wherever we work.
Serving San Anselmo, CA - Our Local Coverage Area
We’re based in the San Anselmo 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 San Anselmo
It depends on what the camera shows. Flex duct with embedded creek silt and mold usually needs replacement, because the liner delaminates after saturation and keeps shedding particles no matter how well it’s cleaned. Rigid galvanized runs can sometimes be cleaned and sealed if the metal is sound and the contamination is surface-level. We run a camera inspection first, show you the footage, and make a clean-versus-replace call you can take to your insurer. Call (980) 447-2498 and we’ll schedule the inspection.
Red Hill Avenue sits on the San Anselmo valley floor, near the floodplain of San Anselmo Creek. Flood intrusions left silt and moisture in the crawl-space ducts of homes along the lower corridor, and the valley’s persistent evening fog keeps those crawl spaces damp for months afterward. Upper Fairfax sits on higher, sun-exposed ground where crawl spaces dry out faster and flood silt never reached. The pattern is geographic, not cosmetic.
Usually it means working in a crawl space with maybe 24 inches of clearance, reconnecting joints that have separated over decades, sealing boot connections at the registers, and sometimes replacing short sections of flex added during a 1960s retrofit. The original rigid galvanized runs in those homes can still be sound, but the connections and later additions rarely are. We fit the repair to the house rather than selling a full replacement whenever the existing material can be sealed and holds.
We run a camera through every affected run and capture time-stamped video and still images of the contamination, whether it’s dried creek silt, mold colonies on the liner, or delaminated material. We also write a service report that states clearly what we found, what we recommend, and whether the damage is consistent with flood intrusion. Homeowners have used our documentation to support claims after the flood events San Anselmo has seen. If you’re filing a claim, call us before you start removing anything, and we’ll document what’s there.
The marine layer that funnels into the Ross Valley every evening keeps crawl spaces and unconditioned attics damp for much of the year, which accelerates mold growth inside flex duct liners and at poorly sealed register boots. Homes on the drier ridgelines above town simply don’t grow mold in their ducts at the same rate. If you’re seeing musty air from your registers in a San Anselmo home, the damp crawl space is the first thing we check.
Written by Marcus Veale, Owner at Linden Air Duct Cleaning, serving San Anselmo and the Ross Valley.