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Duct Repair Cost Calculator
This free duct repair cost calculator gives you a planning estimate for fixing leaking, loose, damaged or uninsulated ducts. Choose leak sealing, reconnecting a duct, replacing a damaged section, adding insulation or pest damage repair, then set the home size or the number of repair spots and how easy the ducts are to reach. You will see a cost breakdown with Budget, Standard and Premium project levels in about two minutes.
OMNIESTIMATE · HVAC · DUCT REPAIR · 071 of 401
Calculator Introduction
Duct Repair Cost Calculator
Answer a few quick questions about your duct repair and the calculator estimates your cost in four steps: Location & Repair Type, Size & Method, Access & Options and Labor Market & Timing. A ZIP code is required so we can match your request with local licensed professionals. It does not change the price. Only the questions that matter for your project are shown, and every setting has a sensible default, so you can get a first estimate in under a minute and then fine-tune.
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Result Explanation
How to Read Your Duct Repair Estimate
Your result shows an Estimated Project Budget, which is the Standard estimate, together with a typical range from Budget to Premium.
Budget
Budget assumes basic sealing materials and lean labor.
Standard
Standard assumes quality mastic, fittings and insulation and a licensed technician at typical rates. This is the best number to plan around.
Premium
Premium assumes higher-grade materials, thorough sealing and testing and premium service.
Below the headline number you will see a category breakdown, a line-item table for all three project levels, and a tip based on your selections. Results update automatically if you change an input after calculating.
What Is Included in Each Cost Category
Materials
Mastic, tape, replacement duct and fittings, insulation and any options you select.
Labor
Technician time for the repair, plus the service call and inspection fee.
Disposal
Disposal of contaminated duct material, only for pest damage repair.
Equipment & Specialty
Aerosol sealing equipment, only when you choose aerosol sealing.
Additional Costs
An urgent or after-hours service premium, when selected.
Not Included
Repairs behind finished walls, drywall repair, painting and mold or asbestos remediation are not included.
The breakdown only shows categories that apply to your project, so you will not see empty $0 rows.
Request Quotes From Licensed HVAC Contractors
Use the estimate above as your planning budget, then request quotes from licensed HVAC contractors using the form below the calculator. Photos of the damaged duct, the attic or crawl space and any condensation or pest signs help contractors quote more accurately.
Duct Repair Pricing Breakdown
How Much Does Duct Repair Cost?
Duct repair typically costs about $1,200 at the Standard level for hand-sealing leaking ducts in a 2,000 to 2,500 square foot home, and about $350 to $1,500 for a small repair such as reconnecting a duct, replacing a section, adding insulation or fixing pest damage. The price depends on the type of repair and on how easy the ducts are to reach.
This calculator uses the following planning figures for easy basement or open attic access, mastic sealing, one repair spot, a 50-foot insulation job and an average labor market. Each estimate includes a service call and inspection:
| Repair | Budget | Standard | Premium |
|---|---|---|---|
| Seal leaking ducts (2,000 to 2,500 sq ft) | $790 | $1,210 | $1,895 |
| Reconnect a loose duct (1 spot) | $220 | $345 | $550 |
| Replace a damaged section (1 spot) | $335 | $535 | $860 |
| Insulate exposed ducts (50 ft) | $470 | $715 | $1,110 |
| Pest damage repair (1 spot) | $555 | $910 | $1,520 |
Change any input and the numbers update, because the calculator prices materials, labor, the service call and any specialty equipment separately.
How This Duct Repair Calculator Works
01 — Choose the repair
Pick leak sealing, reconnecting a duct, replacing a section, insulating ducts or pest damage repair.
02 — Set the size or the number of spots
For sealing, select your home size and sealing method. For other repairs, select the number of spots or the length of duct.
03 — Describe the access
Tell us whether the ducts are easy to reach, in a tight attic or crawl space, or behind finished walls.
04 — Pick options
Select any extras you want, such as a leakage test or an airflow check.
05 — Set your labor market and timing
Choose the market that matches your area and whether the work is urgent. The calculator then prices materials and labor at planning rates and shows three project levels. Your ZIP code is used to match your request with local HVAC contractors. It does not change the price.
What Affects Duct Repair Costs?
Type of repair
Leak sealing closes gaps at the joints and seams of the duct system. Reconnecting a duct fixes a run that has fallen, split or pulled apart. Replacing a section swaps out a crushed, rusted or collapsed piece. Insulating wraps ducts that sweat or lose heat. Pest damage repair fixes chewed ducts and cleans up droppings and nests.
Home size, for sealing
A larger home has more duct and more joints to seal. At the Standard level, mastic sealing costs about $905 for 1,000 to 1,500 square feet, about $1,210 for 2,000 to 2,500 square feet, about $1,445 for 2,500 to 3,500 square feet and about $1,750 for a home over 3,500 square feet.
Sealing method
Mastic and tape are applied by hand at accessible joints. Aerosol sealing seals the whole system from the inside, including joints you cannot reach. It raises the Standard sealing estimate to about $1,850 because it needs special equipment and preparation. The calculator splits the aerosol price between materials and equipment.
Number of spots or length of duct
Several repairs in one visit share the service call. At the Standard level, reconnecting one duct is about $345, two spots about $460 and five spots about $805. Replacing three sections is about $1,070. Insulating 25 feet of duct is about $555, 100 feet about $1,035 and 200 feet about $1,675. Pest damage with three spots is about $1,520.
Access
Easy access, such as an open basement or attic, is the default. A tight attic or crawl space raises the Standard sealing estimate to about $1,460. Ducts behind finished walls and ceilings take the most time, because the installer must open and then close an access cut, and the estimate rises to about $1,740.
Pest damage
Chewed ducts and droppings need more than a patch. The calculator adds cleanup and disposal of contaminated duct material. Ask your contractor to find how the pests got in, or the damage may return.
Options
Options include a duct leakage test, an airflow check at each register, insulation on the repaired section, duct cleaning after the repair and a new air filter. A duct leakage test raises the Standard reconnect estimate from about $345 to about $565. Options appear only when they apply to the repair you chose.
Permits
Most small duct repairs do not need a permit, so the calculator does not include one. A larger duct change may need one, and your local building department sets the rules.
Urgency
Urgent and after-hours calls carry a premium. The calculator adds 15% to labor for work within about 48 hours and 40% for emergencies. An urgent sealing job raises the Standard estimate from about $1,210 to about $1,350, and an emergency raises it to about $1,580.
Budget vs Standard vs Premium Duct Repair
The three project levels reflect real differences, not a simple multiplier:
Budget
Basic sealing and duct materials, a leaner labor rate and fewer labor hours.
Standard
Quality mastic, fittings and insulation and a licensed technician at typical rates.
Premium
Higher-grade materials, more thorough sealing and testing and premium service rates.
Use Standard as your main planning number, and the Budget-to-Premium range to see how much your choices can swing the result.
Repair vs Replace
When repair makes sense
Isolated leaks, loose joints and a few damaged sections can often be repaired for much less than a replacement.
When replacement may make more sense
If the ducts are crushed, wet, moldy, badly leaking or more than about 25 years old, replacement may make more sense. Ask for a duct leakage test before you decide, and use the ductwork replacement calculator to compare.
Regional Pricing Differences
HVAC labor rates vary across the country. Rather than guess from your ZIP code, the calculator lets you choose a labor market, from lower-cost areas to the highest-cost metro areas, and applies it to labor. A highest-cost market raises the Standard sealing estimate from about $1,210 to about $1,585. Materials are not adjusted.
DIY vs Hiring a Licensed HVAC Contractor
Small fixes, such as taping a loose joint with foil tape or mastic, are within reach of some homeowners. Do not use cloth duct tape, which dries out and fails. Hard-to-reach ducts, pest damage and aerosol sealing are better left to a professional.
Questions to Ask HVAC Contractors
- Did you test the ducts for leaks, and what were the results?
- Will you seal with mastic or foil tape, and not cloth duct tape?
- Will you test again after the repair to show the improvement?
- Does the quote include the service call and inspection fee?
- How will you get to ducts that are behind finished walls?
- For pest damage, will you fix how the animals got in?
How to Avoid Unexpected Duct Repair Costs
- Bundle repairs into one visit, so they share one service call.
- Ask for a written scope that lists each repair spot and the sealing method.
- Test before and after so you can see what the repair did.
- Ask about drywall repair. Finish work is not part of this estimate.
- Avoid emergency calls when you can plan the work.
Ready for a Real Quote?
Use the estimate above as your planning budget, then request quotes from licensed HVAC contractors using the form below the calculator. Photos of the damaged duct, the attic or crawl space and any condensation or pest signs help contractors quote more accurately.
Images: no image URLs were supplied — only image suggestions with alt text in the doc (duct joint sealed with mastic and foil tape; disconnected flexible duct in an attic; exposed duct being wrapped with foil-faced insulation; aerosol duct sealing equipment connected to a duct system; flexible duct with holes chewed by rodents; duct repair cost by repair type infographic). No images were uploaded or invented for this page.
Duct Repair Cost & Estimation AEO Guide
Quick Answers About Duct Repair Costs
How much does duct repair cost?
Duct repair commonly costs about $1,200 at the Standard level for sealing leaking ducts in a 2,000 to 2,500 square foot home, and about $350 to $700 for a single reconnect, section replacement or insulation job.
What is duct sealing?
Duct sealing closes leaks at the joints and seams of a duct system with mastic, foil tape or an aerosol sealant, so that heated and cooled air reaches the rooms instead of leaking into the attic or walls.
Is mastic or tape better for sealing ducts?
Mastic and foil tape both work. Cloth duct tape does not, because it dries out and fails. Mastic is often preferred for gaps and seams, and aerosol sealing reaches joints that cannot be reached by hand.
How much does it cost to insulate ducts?
In this calculator, insulating 50 feet of exposed duct costs about $715 at the Standard level, with a range of about $470 to $1,110 across the Budget to Premium levels.
What is the biggest cost driver in duct repair?
The type of repair is the biggest driver, followed by the size of the home or the number of repair spots, and how easy the ducts are to reach.
Duct Repair Cost FAQs
How much does duct repair cost?
In this calculator, a Standard estimate for sealing leaking ducts with mastic in a 2,000 to 2,500 square foot home is about $1,210, with a Budget to Premium range of roughly $790 to $1,895. Smaller repairs cost less. Reconnecting one loose duct is about $345, and replacing one damaged section is about $535.
How much does duct sealing cost?
At the Standard level, mastic and tape sealing costs about $905 for a home of 1,000 to 1,500 square feet, about $1,210 for 2,000 to 2,500 square feet, about $1,445 for 2,500 to 3,500 square feet and about $1,750 for a home over 3,500 square feet.
How much does aerosol duct sealing cost?
Aerosol sealing seals the whole system from the inside and costs about $1,850 at the Standard level for a 2,000 to 2,500 square foot home. It costs more than hand sealing because it needs special equipment and the ducts must be prepared and blocked off first.
How much does it cost to reconnect a disconnected duct?
Reconnecting one loose or torn duct costs about $345 at the Standard level. Two spots cost about $460 and five spots about $805, so the cost per spot falls when several repairs are done in one visit. A duct leakage test adds about $565 in total.
How much does it cost to replace a damaged duct section?
Replacing one crushed or rusted section costs about $535 at the Standard level, and three sections cost about $1,070. The estimate includes the new duct, fittings, sealing and a service call.
How much does it cost to insulate ducts?
Wrapping exposed ducts in insulation costs about $715 at the Standard level for 50 feet. Twenty-five feet costs about $555, 100 feet about $1,035 and 200 feet about $1,675. Insulation matters most for ducts in an attic or crawl space.
How much does access change the price?
Access can change the price a lot. For sealing in a 2,000 to 2,500 square foot home, the Standard estimate is about $1,210 with easy basement or open attic access, about $1,460 in a tight attic or crawl space and about $1,740 when the ducts are behind finished walls or ceilings.
Do I need a permit for duct repair?
Most small duct repairs do not need a permit. A larger system change may, and your local building department sets the rules. This calculator does not include a permit allowance, and it includes a service call and inspection fee in the labor.
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Use this estimate to plan, then get quotes from licensed local HVAC contractors to confirm scope and price.
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This calculator provides a planning estimate only. It is not a quote, bid or guaranteed price. Actual contractor pricing may vary based on location, site conditions, material choice, labor market and the extent of the damage. Repairs behind finished walls, drywall repair, painting and mold or asbestos remediation are not included.