Whole-home duct cleaning
Dryer vent cleaning
Camera inspection
Sanitizing & deodorizingWhole-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.
Styles & brands we work with
- Whole-home duct cleaning
- Dryer vent cleaning
- Camera inspection
- Sanitizing & deodorizing
See the difference
Before
After
Before
After
Before
AfterHow Much Does Duct Repair & Sealing Cost in Castro Valley?
Duct repair and sealing in Castro Valley typically runs $350 to $1,200 for a single repair, and most full-home sealing jobs land between $1,500 and $3,500. A small crack at one joint might only need a patch and mastic, while a system with several disconnected runs and worn flex duct usually hits the upper end. The written estimate sets the final price, and we don’t quote until we’ve seen the ductwork.
We’re duct cleaning Castro Valley, and repair is part of what we do, not an upsell tacked onto a cleaning visit. We run Rotobrush rotary brushes, Nikro HEPA-rated extraction, and Abatement Technologies negative-pressure containment so we can inspect, clean, and repair the whole system without leaving debris behind. For a neighborhood like Castro Village or the older streets near downtown, where 1950s and 1960s homes often have sheet metal with failing seams, the repair scope tends to be bigger than on a newer build in Five Canyons.
Key Takeaways
- Single duct repair: roughly $350-$1,200 depending on access and length.
- Whole-home duct sealing: roughly $1,500-$3,500.
- Full flex-duct replacement: roughly $2,500-$6,000 or more.
- Free estimates, written on the spot, with no service-call fee.
- Call (855) 382-9257. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday, closed Saturday.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the line items break out for Castro Valley homes in 2026. These are typical ranges, not a menu, because every system has different access and different failures. The written estimate is what binds us.
| Job | Typical Range | What It Covers |
|---|---|---|
| Single joint or seam seal | $350-$600 | Mastic or foil tape on a failing joint, small patch on sheet metal |
| Section replacement (flex or metal run) | $500-$1,200 | Cutting out a crushed or torn section and fitting new duct |
| Whole-home duct sealing | $1,500-$3,500 | Sealing accessible joints, boots, and plenum connections throughout the system |
| Full flex-duct replacement | $2,500-$6,000+ | Removing failed flex runs and installing new insulated duct where access allows |
| Attic or crawl space access charge | $150-$500 | Added labor for tight or restricted access to duct runs |
| Post-repair duct cleaning | $300-$700 | Removing construction debris and loosened dust after the repair |
What drives the number up or down comes down to three things: how many separate failures there are, where those failures sit, and whether the ducting is accessible without tearing into drywall. A single boot that pulled loose behind a return grille is quick. A crushed trunk line buried under insulation in a low attic is not. The material matters too. Older sheet metal with failing mastic costs less to seal than flex duct that’s torn, kinked, or sagging off its supports, because flex usually gets replaced rather than patched.
If you want an exact number for your house, call (855) 382-9257 and we’ll schedule a look. Estimates are free.
What Affects Duct Repair & Sealing Pricing in Castro Valley
- Age of the ductwork. Much of Castro Valley’s housing stock went up in the 1950s through the 1970s, and a lot of that ducting is original sheet metal with mastic that has dried out and cracked. Sealing an older system tends to involve more joints, not harder work per joint.
- Attic access and clearances. The mild winters here mean HVAC equipment often sits in a low-pitch attic with limited headroom, and some homes in the hills have ducts tucked into tight framed chases. Tight access adds labor, and labor is most of the bill.
- How much duct is actually leaking. A system leaking from one disconnected joint is a small job. A system leaking at 15 different seams is a sealing job. We don’t guess at this; we inspect and we show you what we found.
- Flex versus rigid duct. Flex is cheap to install and cheap to replace when it fails, but it fails more often. Rigid sheet metal lasts longer but costs more per section to repair.
- Contamination inside the system. If the ducts have years of dust, pet hair, or debris from a renovation, the repair needs to be paired with duct cleaning so the new seals aren’t trapping dirt against the duct wall. We use Rotobrush agitation and Nikro HEPA extraction for that step.
- Access to the air handler and plenum. The plenum connection is often the single biggest leak point in the system. If it’s boxed in or the unit is in a closet with limited clearance, sealing it takes more time.
How to Save on Duct Repair & Sealing
The biggest cost saver is catching leaks before they spread. A sealed joint stays sealed. A joint that’s been leaking for a decade has usually soaked the surrounding insulation, and that insulation has to come out. So the earlier you address a whistling register or a room that never heats right, the cheaper the fix.
- Deal with the whole system, not one register. If you’re already paying for a technician to open the attic, sealing every accessible joint on that same visit costs far less than calling back a second time.
- Ask for a leak inspection before committing to a cleaning. A cleaning on a leaking system wastes money. The clean air exits through the leaks. We inspect first and tell you what we found.
- Bundle the dryer vent. Dryer vent cleaning is one of our three core services, and it’s a fire-risk item, not a sales add-on. If you’re booking a visit anyway, having the dryer vent done on the same trip saves you a second dispatch.
- Skip the repair if the duct is beyond saving. Sometimes patching a 40-year-old flex run is throwing money at a dead system. We’ll tell you when replacement makes more sense than repair, even though it’s a bigger invoice.
The estimate is free, and it’s written. Call (855) 382-9257. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday, closed Saturday.
FAQs – Duct Repair & Sealing Cost
How much does duct sealing cost in Castro Valley?
Whole-home duct sealing in Castro Valley typically runs $1,500 to $3,500, while a single joint repair costs $350 to $600. The range depends on how many joints are accessible and whether the ducting is sheet metal or flex. Call (855) 382-9257 for an exact quote. Estimates are free.
Is it cheaper to repair or replace ductwork?
Repair is almost always cheaper if the ducting itself is sound and only a few joints or sections have failed. If more than about a third of the runs are crushed, torn, or disconnected, replacement usually wins on cost over a few years because you stop paying to patch the same system repeatedly. A single section replacement runs $500 to $1,200, while full flex replacement runs $2,500 to $6,000 or more, so there’s a real gap between the two. We’ll give you both numbers and explain the tradeoff. Call (855) 382-9257 to set up the inspection.
Do I need duct cleaning before or after a repair?
After. A repair opens the system, and cutting into ductwork loosens debris that then travels through the house. If the ducts were already dirty before the repair, the safest sequence is repair, then clean, so the new seals aren’t trapping old dust. We run Rotobrush agitation, Nikro HEPA extraction, and Abatement Technologies negative pressure to keep that dust out of your living space. Call (855) 382-9257 to schedule.
Can you come today?
Often, yes. We dispatch Sunday through Friday, 7am to 7pm, and same-day visits are common when the schedule has room. Call (855) 382-9257. We answer 24/7, and a call outside dispatch hours is booked into the next opening, Sunday through Friday, 7am to 7pm.
Why does my Castro Valley home need duct sealing at all if the winters are mild?
Because leaks cost you year-round. Mild weather doesn’t stop a leaking duct from pulling attic dust into a bedroom or pushing cooled air into the attic in summer. In Castro Valley, the more common issue is dust and pollen that gets pulled in through return leaks and redistributed through every register. Sealing fixes the source rather than cleaning the symptom. Call (855) 382-9257 and we’ll inspect the system and show you where it’s leaking.
Why We Inspect Before We Quote
A price on duct repair without an inspection is a guess. Duct leaks hide behind insulation, above ceiling drywall, and inside framed chases, and the only reliable way to price the job is to get eyes on the system. We use the same professional equipment for inspection that we use for the work itself, and we walk you through what we find. If the ducting is sound, we say so. If a run needs replacing, we show you why.
Our three services cover the whole system under one roof: duct cleaning, duct repair, and dryer vent cleaning. That means no coordinating between a cleaning company and a duct repair contractor, and no finger-pointing when something isn’t right. We’re the same crew, start to finish.
We also know the air quality equipment that lives downstream of the ducts. Honeywell, Aprilaire, and Guardsman filtration products all interact with the duct system, and a technician who understands that ecosystem can tell you whether a sealing job will actually improve indoor air quality or whether a filter change is the better first move. We’re familiar with all three lines and we’ll be straight with you about what helps and what doesn’t.
Our service area covers Castro Valley and the surrounding East Bay communities, and we’ve been at this since 2012. Fourteen years in, we still believe the same thing: clean ducts are the start, sealed and intact ducts are the finish.
Contact Us for a Free Duct Repair & Sealing Estimate
If you’re hearing whistling at your registers, seeing dust collect faster than it should, or noticing a room that never heats the way the rest of the house does, that’s worth a look. We’ll inspect your system, show you what we found, and give you a written estimate with real numbers before any work starts. The estimate is free, and there’s no service-call fee.
Call (855) 382-9257. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday, closed Saturday. Same-day visits are often available when you call early, and we’ll book you into the next opening if the day is full. One call, one crew, your whole duct system handled.
Pricing reflects the Castro Valley market as of 2026. Duct Cleaning Castro Valley offers free estimates – call (855) 382-9257.
Written by the team at Duct Cleaning Castro Valley, serving Castro Valley since 2012.
What Our Customers Say
"Found a disconnected run in the crawlspace while they were in there and told me about it rather than cleaning around it."
- Renee Thompson"Two guys, about three hours, plastic down at every register, and they wiped the vent covers before putting them back."
- Malik Nash"Fast, fair, done right. No notes."
- Gilbert Rodriguez