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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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AfterHow Much Does Duct Repair & Sealing Cost in Santa Clarita?
Duct repair and sealing in Santa Clarita typically costs between $450 and $1,900 for most homes, with the average job landing around $950 to $1,300. Simple repairs like patching a small tear or sealing a disconnected joint run $150 to $400, while full-system duct sealing with mastic and aeroseal-style applications on a 2,000-square-foot home runs $1,200 to $2,800. The exact number depends on how much of your ductwork is accessible, how many leaks exist, and whether you’re in Valencia, Canyon Country, Saugus, or Newhall, where home ages and HVAC layouts vary meaningfully.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s what we’re seeing across Santa Clarita in 2026, based on the jobs our technicians at Hollis Air Duct Santa Clarita handle week to week:
| Job Type | Typical Price Range | What It Includes |
|---|---|---|
| Minor duct patch (small hole, loose joint) | $150 – $400 | Spot repair with foil tape or mastic, one access point |
| Moderate repair (2-3 leaks, disconnected section) | $400 – $900 | Multiple access cuts, mastic sealing, reassembly |
| Full duct sealing on 1,500 sq ft home | $900 – $1,800 | Sealing accessible supply and return runs, pressure test |
| Full duct sealing on 2,500+ sq ft home | $1,500 – $2,800 | Larger systems, attics with deeper insulation, multi-zone setups |
| Duct section replacement (rusted or crushed run) | $250 – $700 per section | New galvanized or flex duct, hangers, and sealed connections |
| Duct insulation wrap or replacement | $300 – $1,000 | Depends on R-value and attic accessibility |
| Whole-home duct inspection with camera | $99 – $250 | Pre-repair diagnostic, often credited toward repair cost |
These numbers reflect the Santa Clarita market specifically. We see slightly higher prices in Stevenson Ranch and Westridge due to larger floor plans and longer trunk line runs. Canyon Country homes built in the 1980s and 1990s often need more repair work because the original metal duct joints have separated over 30-plus summers of expansion and contraction.
What moves the price up or down? First, accessibility. If your ducts run through a crawl space with 18 inches of clearance, expect the job to take longer and cost more than an attic with plywood decking. Second, leak severity. A home losing 30 to 40 percent of conditioned air through leaky ducts needs comprehensive work, not a patch job. Third, the sealing method. Mastic and foil tape applied by hand is the standard and most cost-effective. Aeroseal-style pressurized sealing, where a polymer is blown through the system to coat leaks from the inside, runs higher but reaches joints no technician can physically access. We tell Santa Clarita homeowners both options honestly and price them in writing before any work starts.
What Affects Duct Repair & Sealing Pricing in Santa Clarita
Every bid we write reflects what we find in your specific home. Here’s what actually moves the number:
- Duct location and attic conditions. Santa Clarita attics hit 130 to 140 degrees in July and August. Technicians working in that heat move slower and need more hydration and safety breaks. Homes with tight attics or buried ducts under blown-in insulation cost more because we have to dig out each run before we can inspect and seal it. In Valencia’s newer tracts, ducts are often hung higher and spaced tighter, which adds labor time.
- Number of leaks and system age. A 2006 home in Saugus might have two or three separated joints. A 1987 home in Canyon Country often has a dozen or more, plus rust at the plenum connection. We find more, we quote more. The price reflects the leak count we document, not a flat fee that gets padded.
- Sealing method. Hand-applied mastic runs $900 to $1,800 for a typical system. If we recommend aeroseal because leaks are inside walls or under slabs, expect $2,000 to $3,500. That’s a real difference, and we explain which one your house actually needs. Sometimes hand sealing covers 90 percent of the problem and the extra cost of full aeroseal isn’t justified.
- Duct size and system layout. Santa Clarita homes range from 1,100-square-foot condos near the mall to 4,000-square-foot properties in Sand Canyon. More square footage means more linear feet of duct, more boots, more returns, more time.
- Repair versus replacement. If a section of flex duct is crushed, torn, or infested with rodent droppings, sealing won’t fix it. We replace the run. New flex duct with proper R-6 insulation runs $250 to $700 per section installed, and a home with extensive damage can need several replaced.
- Time of year. Santa Clarita’s peak HVAC season runs May through September. Demand for any duct work spikes in June when temperatures push past 100 and homeowners notice rooms that won’t cool. Off-peak work, from October through March, sometimes gives us more scheduling flexibility, though our pricing structure stays consistent because we don’t raise rates seasonally the way some outfits do.
Why Duct Repair & Sealing Costs What It Does
The core of the job is labor, but there’s more to it. Here’s where the money goes on a typical Santa Clarita duct sealing job:
- Diagnostic time (15-20% of the bill). We don’t quote blind. The technician inspects the plenum, traces accessible supply and return runs, checks boots at each register, and often runs a camera through main trunk lines. In a Santa Clarita attic this takes 45 minutes to two hours depending on the home. A pressure test or hood test after sealing adds another 30 minutes.
- Materials (10-25%). Mastic, foil tape, duct sealant, zip ties, hangers, access panels, replacement flex duct, and insulation wrap. For aeroseal jobs the polymer and injection equipment account for a larger share.
- Labor and attics conditions (50-60%). This is the honest biggest line. Attic work in Santa Clarita is slow. Temperatures inside an attic in August exceed 130 degrees routinely. Safe, thorough work takes time. A crew that rushes through duct sealing leaves leaks behind and the job fails within months. We’d rather spend the extra hour and give you a system that holds.
- Verification and cleanup (5-10%). After sealing, we re-test pressure where applicable and walk each register to verify airflow. We clean up debris, old tape, and fallen insulation. You shouldn’t know we were there except that your rooms hold temperature better.
What Duct Repair & Sealing Should Include for the Price
A fair quote in Santa Clarita should cover more than a technician smearing mastic on a few joints. Here’s what we include on every Duct Repair & Sealing in Santa Clarita job, and what you should look for from any company you call:
- Written inspection findings. We document leak locations, tape them off or photograph them, and show you what we found before we quote. If a company won’t show you the problem, walk away.
- Written price before work begins. The number we quote is the number on the invoice. No “we found additional issues and had to add $600” surprises. If we find something mid-job that genuinely changes the scope, we stop, explain, and get your approval in writing. That’s the Garrison Standard, and it’s how every Hollis location runs.
- Proper materials. Fiberglass-reinforced foil tape, water-based mastic rated for HVAC, and R-6 or R-8 flex duct for any replacements. Not hardware-store duct tape, which fails within a season in a Santa Clarita attic.
- Verification. When the job allows, we run a duct blaster or flow hood test before and after. You see the measured improvement, not just a technician’s word.
- Clean workspace. We lay drop cloths, wear shoe covers inside the living space, and haul out every scrap. The Garrison Code requires the site left clean on every job, no exceptions.
- A written guarantee. Our 365-Day Done Right Promise covers every repair and sealing job in writing for a full year. If the work fails, we return and make it right at no charge, including a free second visit. That’s part of the price. Not an add-on. Not a warranty you have to register for.
Repair vs. Replace: When Sealing Isn’t Enough
Sometimes the right answer is replacing a duct section, not sealing it. Sealing a duct with collapsed inner liner, rodent damage, or rust-through is a band-aid. You’ll pay for a seal and be back on the phone with us in six months. A good technician tells you that upfront.
In Santa Clarita, we see three common situations where replacement beats repair:
- Crushed flex duct. Attic foot traffic, previous contractors, or storage boxes flatten flex runs and strangle airflow. Sealant won’t restore the shape. A new R-6 flex run costs $250 to $700 per section and restores full airflow immediately.
- Rodent contamination. The hillside neighborhoods, especially parts of Saugus and Canyon Country, have roof rat and mouse populations. When rodents nest in ductwork, the droppings and urine inside the duct require full replacement, not just sealing. Sealing old contaminated duct traps the problem inside your air stream.
- Rusted metal ducts. In older Newhall and Valencia homes near the coast-influenced microclimates, we see metal ducts with rust at the seams and plenum connections. Once rust perforates the metal, patching buys you a year at best. Replacing the section is the honest fix.
Our techs never upsell, because the price you pay for replacement should be justified by the condition we show you. We’d rather replace one 12-foot run and seal the rest than convince you to replace the whole system when the old metal is still solid.
How to Save on Duct Repair & Sealing in Santa Clarita
Duct repair is not a place to chase the cheapest bid. A $250 “whole house duct cleaning and sealing” special from a flyer is going to be a guy with a shop vac and a roll of tape who seals nothing. You’ll pay twice. That said, there are legitimate ways to control the cost:
- Get the inspection done in the off-season. Schedule your duct inspection and repair between October and April. You’ll have more scheduling options, and you’ll catch small problems before summer heat forces you into emergency mode.
- Combine duct sealing with duct cleaning. If your ducts are filthy, we clean first, then seal. Bundling the two jobs saves you a second trip charge and gets both done in one visit. Hollis Air Duct Santa Clarita runs Rotobrush rotary brush systems and Nikro negative-air machines, and sealing after cleaning means we’re working on a clean surface, which helps the mastic bond better.
- Fix accessibility before we arrive. Clear a path to the attic hatch or crawl space entrance. Move boxes or storage out of the way of return registers. The less time a technician spends moving your belongings, the less labor you pay for.
- Address return-side issues early. Santa Clarita homes often have undersized or poorly sealed returns. Fixing return leaks and adding a return in a hot room is cheaper than running a new duct line and often solves comfort complaints at half the cost.
- Ask about what’s included. Some companies quote low and charge separately for travel, materials, or “sealant.” Our price is one number, written down. If a quote seems wildly low, ask what’s included. You’ll usually find the omissions.
- Get a free estimate and compare. Hollis Air Duct Santa Clarita gives free estimates on duct repair and sealing. Call (661) 523-0295 and we’ll send a technician to inspect, measure, and write you a price with no obligation. Comparing a real, written quote against a phone estimate will tell you a lot about who you’re dealing with.
How Long Does Duct Repair & Sealing Take in Santa Clarita?
Most repair and sealing jobs are done in a single day. A modest home in Valencia with four to six leaks takes 3 to 5 hours including inspection, sealing, and verification. A larger home in Stevenson Ranch with extensive duct runs and multiple problem areas can take 6 to 8 hours, occasionally split across two visits if the attic heat forces shorter work windows in summer.
We book a specific window and arrive inside it. That’s a Garrison Standard rule, not a goal. When you schedule with Hollis, the technician’s name is on the work order, and they arrive in uniform with a marked vehicle. No “someone will be there between 8 and 2.” You’ll know who’s coming and when.
How Much Does Duct Repair & Sealing Cost in Santa Clarita? The Short Answer
For most Santa Clarita homes, expect to pay $450 to $1,900 for duct repair and sealing, with the typical job coming in at $950 to $1,300. That’s the honest range in 2026 for work done right with proper mastic, foil tape, and verification, not a flyer special. Every house is different, and the only way to get a real number is to have someone look at your specific ductwork. We do that for free.
If you want the number before you commit to anything, call (661) 523-0295 and ask for a free estimate. Roy Castellanos leads our Santa Clarita team, and he’ll make sure you get an inspection, a written price, and a straight answer about what your ducts actually need.
FAQs – Duct Repair & Sealing Cost in Santa Clarita
How much does duct sealing cost in Santa Clarita?
Duct sealing in Santa Clarita costs $900 to $2,800 for a full-system job on a typical home, with the average around $1,300. A smaller condo under 1,200 square feet can be done for $500 to $900, while a large two-story home with buried ducts runs $2,500 to $3,500. The price includes inspection, sealing of accessible joints with mastic and foil tape, and verification. Call (661) 523-0295 for an exact quote. Estimates are free.
Is duct sealing worth the cost?
Yes, if your ducts leak. The Department of Energy estimates typical homes lose 20 to 30 percent of conditioned air through leaky ducts, and Santa Clarita’s summer heat punishes that inefficiency hard. A $1,300 sealing job that saves 20 percent on a $400 monthly summer cooling bill pays for itself in about 16 months, while also fixing hot rooms and dust problems. If your leaks are minor, a $300 repair might do it. The only way to know is an inspection, which we do for free.
How much does it cost to repair a hole in ductwork?
A single hole or separated joint in accessible ductwork costs $150 to $400 to repair in Santa Clarita. That includes opening the access point if needed, sealing with mastic or reinforced foil tape, and reassembly. If the duct section is crushed or contaminated, replacement runs $250 to $700 per section. Multiple holes add up; we price per repair, not per hour, so you know the total before we start.
Why is duct sealing so expensive?
The biggest cost is labor, and most duct systems in Santa Clarita run through attics that hit 130 degrees in summer. Technicians work in respirators and take heat breaks. Safe, thorough work is slower. Materials, primarily mastic and foil tape, account for 10 to 25 percent of the bill. The remaining cost goes to inspection, verification, and cleanup. Companies charging under $300 for full duct sealing are not sealing your ducts; they’re smearing something on a few visible joints and leaving.
Can you come today for a duct repair in Santa Clarita?
We keep schedule capacity for emergency duct repairs, especially when a system is down entirely or a duct has collapsed and rooms have no airflow. Call (661) 523-0295 anytime; a live person answers around the clock, and we’ll tell you honestly whether same-day service is available. If we can’t get there today, we’ll get you the earliest slot and put the price in writing before we arrive.
Does homeowners insurance cover duct repair in Santa Clarita?
Usually not, unless the damage was caused by a covered peril like fire, storm damage, or a contractor’s error during a remodel. Normal wear, separated joints, and aging flex duct are maintenance issues. Rodent damage is sometimes covered if you carry the right endorsements, but most standard California policies exclude it. We recommend calling your agent to confirm before you assume you’re out of pocket.
Why Santa Clarita Homeowners Choose Hollis for Duct Repair & Sealing
We’ve been at this since 2004, and we’ve worked in nearly every neighborhood in Santa Clarita: Valencia, Newhall, Canyon Country, Saugus, Stevenson Ranch, Castaic. That matters because ducts fail differently in different parts of this valley. We know which 1980s Canyon Country floor plans hide separated plenums. We know which Stevenson Ranch models have undersized returns from the builder. We know that Hillside homes in Saugus with exposed south-facing attics run hotter and need different sealing materials than shaded Newhall properties.
But more than the local knowledge, what sets Hollis apart is the paperwork. Every job gets a written price before we touch a tool. Every repair is covered by the 365-Day Done Right Promise: if it fails within a year, we return and make it right at no charge, with a free second visit included. That’s not a marketing line. It’s in the contract. The Garrison Standard requires it of every independent Hollis location. We run Rotobrush rotary brush systems, Nikro negative-air machines, and filtration equipment from Honeywell, Aprilaire, Abatement Technologies, and Guardsman, not because the brand names matter but because commercial-grade tools let us verify the work instead of guessing at it.
If your ducts are leaking, you probably already feel it: a bedroom that won’t cool, a dusty hallway, a summer electric bill that makes you wince. We’ll find the leaks, show them to you, and give you a number. One number. In writing. Then we’ll do the work by the book and back it for a year.
Call (661) 523-0295 for a free estimate. A live person answers, day or night, and we’ll set up an inspection at a time that works for you.
Pricing reflects the Santa Clarita market as of 2026. Hollis Air Duct Santa Clarita offers free estimates – call (661) 523-0295.
Written by Roy Castellanos, Owner at Hollis Air Duct Santa Clarita, serving Santa Clarita since 2004.
What Our Customers Say
"No sales pitch. Told me which parts of the system were fine and only cleaned what needed it."
- Ted L."Crew arrived in uniform at the exact time promised. Covered the floors, cleaned all the supply and return vents, and brushed out the main trunk. Vet-owned, and it shows in the discipline."
- Duane S."Dryer vent was packed with lint and took two hours to dry a load. Cleaned it out from the roof cap down. One cycle again."
- Paula Q.