Duct Repair & Sealing Cost in Fort Collins - We Measure the Leak Before We Quote

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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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How Much Does Duct Repair & Sealing Cost in Fort Collins?

Duct repair and sealing in Fort Collins typically runs $350 to $1,200 for a single accessible repair and $1,500 to $4,500 for a whole-system reseal, with most repairs on a typical Fort Collins ranch or two-story landing between $500 and $900. Small fixes like a single disconnected boot or a taped joint that has failed usually cost $350 to $550, while a system with multiple leaks, crushed flex runs and hidden attic damage climbs higher. The written estimate sets the final price on your job.

We don’t quote a flat rate over the phone, because no two duct systems in Fort Collins leak in the same places. What we can tell you is how the pricing breaks down, what pushes a job toward the top of the range, and how to tell whether you need repair at all or just a thorough cleaning.

Key Takeaways

• Single accessible duct repair: $350-$550
• Multiple repairs on one system: $600-$1,200
• Whole-home duct sealing: $1,500-$4,500 depending on length and access
• Combined cleaning plus repair: $700-$2,000 for most Fort Collins homes
• Our technicians have up to 12 years of experience with Rotobrush, Nikro and Abatement Technologies equipment
• Estimates are free and the written estimate sets the price

For the cleaning side of the work, our duct cleaning Fort Collins page walks through what a full service visit involves.

Duct Repair & Sealing Cost Breakdown (2026)

Here is how the numbers shake out for Fort Collins homes in 2026. Every range is an estimate for the work described, and the written estimate you receive after we inspect the system is the final word.

Several things move a job up or down the range. The biggest is access. A leak behind a drywall ceiling costs more to reach than a leak at an exposed attic trunk. The second is how long the system has been leaking. Duct tape that failed a decade ago has usually pulled insulation and drywall dust into the leak, which means more cleanup and sometimes more than one repair. Third is material. Flex duct is cheap to replace; rigid metal or ductboard takes longer and costs more. Fourth is how many separate leaks exist. A system with one boot problem is a small job. A system with leaks at the trunk, both branches and every register boot is a reseal, not a repair.

Northern Colorado’s climate matters here. Fort Collins swings from single-digit winter mornings to 95-degree July afternoons, and that temperature range works on duct joints year after year. The seams most likely to open up are the ones facing unconditioned attic space, where the temperature inside and outside the duct is furthest apart. We see more failed tape and dried-out mastic at those points than anywhere else in the system.

What Affects Duct Repair & Sealing Pricing in Fort Collins

No two Fort Collins homes price the same, even when they look similar from the street. Here is what actually changes the number.

• Access to the duct system. A ranch with a walk-in attic and exposed trunk lines is a fast, straightforward repair. A two-story with ductwork buried behind finished ceilings means we may need to open drywall, work through a small access hole, or reroute a run to get the repair done right. That routing and drywall work is the single biggest variable in the price.
• Age and type of ductwork. Homes built through the 1970s and 1980s often have rigid metal duct sealed with now-crumbling duct tape, which means a reseal job. Newer builds tend to use flex duct, which is faster to replace but easier to crush and tear during other work. Each type prices differently, and we quote them separately.
• Number and location of leaks. One disconnected register boot in a hallway is a $350-$550 fix. Five leaks spread from the basement to the second-floor ceiling is a $600-$1,200 job. A system-wide reseal covers every joint, seam and connection, which is why it starts around $1,500.
• Attic and crawlspace conditions. Fort Collins attic temperatures climb well past 100 degrees in summer and drop below freezing in winter. That’s hard on flex duct, insulation and mastic. Attic and crawlspace work also takes more setup and containment than an accessible indoor repair, and the price reflects the extra time.
• Contamination and cleanup. When a leak has been pulling attic dust, insulation fibers or pest debris into the system, the repair has to include cleaning. We use Abatement Technologies containment units and Nikro HEPA extraction for jobs where contamination is part of the picture, so the repair doesn’t just re-seal a dirty system.
• Whether it’s repair-only or repair-plus-cleaning. Repairing a leaking system that’s also full of dust makes sense to do in one visit. Many Fort Collins homeowners find that combined cleaning and repair is a better value than two separate appointments, and it lands most jobs in the $700-$2,000 range.

If you’re weighing repair against a full cleaning first, our Fort Collins service page shows how the two services fit together.

Is Duct Sealing Worth the Cost in Fort Collins?

For a home with real leaks, yes. Sealing a system that’s losing conditioned air into an attic or crawlspace is money that stays in your house instead of leaking out of it. The tricky part is knowing whether you have leaks. A system can feel fine from the living room while 20 feet of duct in the attic is disconnected and blowing warm air into insulation.

What we look for during inspection: visible gaps at register boots, tape that has peeled or dried, crushed flex runs where someone stepped on the duct in the attic, disconnected joints at the plenum, and dust streaks at seams where air escapes and back-washes grime. That last one is a strong signal. If the seam is striped with dust, air is moving through it. We also check for return-air leaks, which are easy to miss and pull attic air straight into the living space.

Conditioned air leaking out of the system isn’t just a comfort and energy issue. Return leaks pull in whatever is in the attic: dust, insulation fibers, small pest debris. For homeowners focused on indoor air quality, sealing those returns is often the most valuable repair on the system. Our technicians have up to 12 years of experience identifying exactly these kinds of leaks with Rotobrush agitation and Nikro HEPA tools, and the inspection is free.

How to Save on Duct Repair & Sealing in Fort Collins

There are a few real ways to bring the number down without skipping the work that matters.

• Get the inspection first. A free inspection tells you which leaks exist and what they cost to fix. It also separates “must fix now” from “worth doing eventually.” We hand you a written report so you can compare and decide, not sign on the spot.
• Bundle repair with cleaning when it makes sense. A leaking system is often a dusty system. Doing both in one visit saves a trip and gets the system clean before the repair seals away contamination.
• Fix small leaks before they multiply. A single failed boot costs $350-$550 today. Left alone, the same leak pulls dust and moisture into the transition, and the repair grows. Catching it early is cheaper than catching it late.
• Ask for material options. Where access allows, a flex run replacement costs less than a rigid section replacement. Where durability matters, rigid may be the better long-term choice. We’ll show you both and quote both.
• Skip the bargain bin. A $99 whole-house special is usually a cleaning-only visit that won’t find a crushed duct behind drywall. The cheapest path to a good result is a proper diagnostic and a written estimate, which costs nothing.

Call (844) 834-5984 for a free estimate. We answer 24/7, and fast dispatch from 7am to 7pm means a technician can be at your door the same day for most Fort Collins calls.

Should You Repair, Seal or Replace Your Ductwork?

Repair fixes a specific problem. Sealing treats the whole system as one pressure boundary. Replacement makes sense when the duct is physically compromised beyond patching. Most Fort Collins homes we inspect need repair or sealing, not replacement.

Here’s how we decide:

• Repair when the leaks are isolated and the duct material is still sound. A disconnected boot, a torn flex section, a failed taped joint.
• Seal when the leaks are widespread across seams and joints but the duct runs themselves are intact. Mastic sealing at every joint and seam is the right call here.
• Replace when the duct is crushed beyond recovery, made of degraded ductboard, or has contamination that can’t be cleaned out safely. Replacement runs $180-$900 per section depending on material and access.

We use Abatement Technologies containment equipment because mold and contaminant jobs demand it. If a duct system has been wet, sealing over the problem without containing and cleaning it first just traps moisture. That’s a mistake we won’t charge you to make.

What’s Included in a Duct Repair Estimate in Fort Collins?

Every estimate starts with an inspection of the visible system: the air handler, the plenum, the trunk runs, branch runs, register boots and returns. From there we note each leak, its location, the duct material, and the access route to fix it. You get a written report and a written estimate. No surprise charges.

What’s included when we do the work:

• Setup with containment and floor protection (Guardsman-grade protective products)
• Agitation and HEPA extraction where the system needs cleaning first (Rotobrush and Nikro)
• Repair or replacement of the compromised duct section
• Mastic sealing at all accessible joints and seams (never just tape)
• Reconnection and sealing of register boots and returns
• Airflow check after repair to confirm the leak is closed
• Written record of what was repaired, so a future owner or property manager has documentation

If your home has Honeywell or Aprilaire IAQ components in the system, we know how to work around them without disturbing or compromising them. We service and stock those components and can talk through replacements during the same visit if something needs updating.

Why Pricing Varies More on Duct Repair Than Duct Cleaning

Cleaning prices cluster. Repair prices spread. That’s because cleaning covers a known area (a system of ducts) with a known process, while repair depends on what the inspection turns up. Two homes in the same Fort Collins neighborhood, both 2,200 square feet, can be a $400 job and a $2,400 job, and neither estimate is wrong.

What makes the difference: hidden leaks that only show up when air is moving, duct material that’s failing differently than it looks, and access problems that require cutting and patching drywall. This is why we don’t quote duct repair over the phone and why we don’t offer a flat rate. A phone quote is a guess, and a guess that’s too low means a surprise bill, and one that’s too high means you may skip a repair you need.

Property managers in Fort Collins should plan on an inspection per unit before budgeting. Our written reports are designed to be shared with owners and kept in the property file, so the repair history travels with the building.

Common Duct Problems We Find in Fort Collins Homes

Northern Colorado homes share a few duct issues. Knowing what we typically see helps you understand your own estimate.

• Disconnected flex duct in attics. Flex runs can pull off the collar when the attic temperature swings. That’s a $350-$550 fix per run.
• Cracked duct tape on older rigid systems. The grey duct tape of previous decades dries and peels. A reseal with mastic is the durable answer.
• Crushed flex from construction or cable work. Anyone who has crawled through an attic can step on a duct. The fix is a run replacement.
• Loose register boots. Thermal expansion over years loosens the boot-to-floor connection. Air leaks into the wall cavity instead of the room.
• Return leaks pulling attic air. The most overlooked issue and one of the most important for indoor air quality.

If your dryer vent is also running hot or slow, that’s a separate service. Our dryer vent cleaning page covers safety and pricing for that.

FAQs – Duct Repair & Sealing Cost

How much does duct repair cost in Fort Collins?

Duct repair in Fort Collins typically costs $350-$550 for a single accessible fix and $600-$1,200 for multiple repairs on one system. Whole-system sealing runs $1,500-$4,500. Every estimate is free and the written estimate sets the price. Call (844) 834-5984 for an exact quote.

How much does whole-home duct sealing cost in Fort Collins?

Whole-home duct sealing typically runs $1,500-$4,500 depending on system size, duct material and access. Attic and crawlspace work sits at the higher end. A free inspection tells you which leaks exist and what sealing them will cost. Call (844) 834-5984 for a written estimate.

Can you come today for a duct repair inspection?

For most Fort Collins addresses, yes. Fast dispatch from 7am to 7pm means same-day inspections are often available, and we answer 24/7. Call (844) 834-5984 to book. The inspection and estimate are free.

Is it cheaper to repair or replace my ductwork?

Repair is cheaper in almost every case, at $350-$1,200 versus $180-$900 per section for replacement. Replacement only wins when the duct is crushed, degraded ductboard, or contaminated beyond cleaning. We quote both options when the inspection leaves the choice open. Call (844) 834-5984 to find out which category your system is in.

Does duct cleaning include duct repair?

No. Cleaning and repair are separate services with separate prices. Cleaning typically runs lower than repair, and a combined cleaning-plus-repair visit usually lands at $700-$2,000 depending on what needs fixing. We list them separately so you know exactly what you’re paying for. Call (844) 834-5984 for a combined estimate.

Do I need a permit for duct repair in Fort Collins?

Some duct repairs do and some don’t, and the rules vary by scope. A like-for-like reconnect or reseal typically doesn’t require one; moving or replacing a substantial portion of the system may. Check with the city’s building department before work begins if the repair touches the layout of the system.

What causes duct leaks in Fort Collins homes?

Temperature swings, failed duct tape, crushed flex runs, loose register boots and return-air gaps between the duct and the wall cavity all cause leaks. Northern Colorado’s freeze-and-thaw cycles are hard on attic duct joints and mastic. A free inspection identifies which leaks exist and what they’ll cost to fix. Call (844) 834-5984.

Get a Free Duct Repair Estimate in Fort Collins

If you suspect your ducts are leaking, the first step is a free inspection. We’ll walk the system with you, show you what we find, and give you a written estimate in the same visit. No pressure, no mystery charges. Call (844) 834-5984. We answer 24/7, and fast dispatch from 7am to 7pm, Sunday through Friday, means we can usually get to your Fort Collins home the same day. Our technicians have up to 12 years of experience, and we bring Rotobrush, Nikro and Abatement Technologies equipment into your home because that’s what the work deserves.

Pricing reflects the Fort Collins market as of 2026. Duct Cleaning Fort Collins offers free estimates – call (844) 834-5984.

Written by the team at Duct Cleaning Fort Collins.