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Ductwork replacement cost calculator
Estimate air duct replacement and ductwork installation cost before you approve an HVAC bid. Use the ranges below to separate normal duct scope from vague change-order risk.
Direct answer
Ductwork replacement often ranges from about $1,500 for partial replacement to $4,500-$14,000+ for full-home air duct replacement. The final quote depends on home size, attic or crawl space access, return-air changes, insulation, permits, testing, and whether the HVAC contractor itemizes duct scope in writing. If damage is limited to a leak or one branch, start with the air duct repair cost estimator before treating full replacement as the default.
Choose the correct ductwork task
Remove appropriate debris from otherwise serviceable ducts; cleaning does not fix leakage or damage.
Fix a disconnected, crushed, torn, or damaged section.
Reduce leakage when the duct layout and materials remain serviceable.
Add a thermal and vapor-barrier layer to sound, dry ducts.
Remove or abandon existing ducts with widespread failure.
Replace under-floor trunks, crossovers, boots, and belly closure.
Design a supply-and-return system where usable ducts do not exist.
| Scope | Planning range | Quote check |
|---|---|---|
| Duct inspection and minor sealing | $500 - $2,000 | Best for small leakage or accessible joint sealing; ask whether airflow and returns were measured. |
| Partial ductwork replacement | $1,500 - $5,500 | Common when one trunk, branch run, return, or damaged section is being replaced. |
| Full air duct replacement | $4,500 - $14,000+ | Requires room-by-room sizing, supply and return design, insulation, access, and permit assumptions. |
| Crawl space ductwork replacement | $3,500 - $12,000+ | Moisture, clearance, insulation, pests, and difficult access can change labor quickly. |
| Attic ductwork replacement | $4,000 - $13,000+ | Heat exposure, insulation, platform access, and return-air routing should be explained. |
| Mobile home ductwork replacement | $2,000 - $7,000+ | Underbelly access, crossover ducts, insulation, and vapor barrier repairs can affect scope. |
Flex duct is not priced only by material length. A complete proposal should identify the inner-duct diameter, insulation rating, vapor jacket, support spacing, bend radius, takeoffs, boots, collars, joint sealing, and final airflow check. A low per-foot price can omit the fittings and labor that determine performance.
Ask whether insulation is factory-wrapped with the new duct, added around rigid duct, or repaired as a separate task. Wet, torn, compressed, or poorly sealed insulation may need replacement, but insulation alone does not correct leakage, bad sizing, missing returns, or damaged duct interiors.
Estimate duct insulation separatelyThese modeled planning ranges assume accessible ducts, standard access, insulation included, and no additional return-air work. They use the same minimum project allowances as the calculator. Attic or crawl-space access and return-air changes can increase the result. These are not contractor quotes or measured local averages.
| Home size | Partial replacement | Full replacement |
|---|---|---|
| 1,200 sq ft | $1,500 - $3,500 | $4,500 - $7,500 |
| 1,600 sq ft | $1,800 - $4,400 | $4,500 - $9,200 |
| 2,000 sq ft | $2,200 - $5,500 | $4,500 - $11,500 |
| 2,400 sq ft | $2,600 - $6,600 | $5,400 - $13,800 |
| 3,000 sq ft | $3,300 - $8,300 | $6,800 - $17,300 |
| Scenario | Cost impact | Question to ask |
|---|---|---|
| Usable existing ducts | Lowest duct-related risk | Did the contractor inspect leakage, returns, insulation, and airflow before saying the ducts are reusable? |
| Existing ducts need sealing or return changes | Moderate added scope | Is duct sealing, return-air work, balancing, or testing included as a line item? |
| Central air without existing ductwork | Major project expansion | Compare full duct installation against ductless mini split and heat pump alternatives before signing. |
| Ductwork marked TBD | High change-order risk | Ask for an allowance, inspection note, and written trigger for any extra duct charges. |
Air duct repair cost decision
A low air duct repair quote can be appropriate for isolated damage. Full replacement needs stronger evidence: widespread leakage, undersized returns, damaged materials, poor layout, or access work that makes piecemeal repairs impractical.
| Observed condition | Likely path | Quote check |
|---|---|---|
| One accessible joint or short run leaks | Repair or seal | Ask how leakage was found and whether the repair includes airflow verification after sealing. |
| A branch is crushed, disconnected, or poorly insulated | Targeted section replacement | Request the affected footage, material, insulation value, access assumptions, and cleanup scope. |
| Several rooms have weak airflow or return-air problems | Diagnose before pricing | Require static-pressure or room-airflow findings before approving a larger system or full duct replacement. |
| Old ducts have widespread damage, contamination, or poor sizing | Full redesign or replacement may be justified | Compare at least three itemized bids that separate design, supply runs, returns, insulation, permits, and testing. |
Ductwork replacement often ranges from a few thousand dollars for partial replacement to the low five figures for full-home duct replacement. Final cost depends on home size, attic or crawl space access, return-air needs, insulation, permits, and whether the HVAC quote includes testing and balancing.
No. HVAC replacement usually covers equipment such as the condenser, air handler, furnace, or heat pump. Air duct replacement covers the distribution system that moves air through the home. A complete quote should say whether ducts are reused, sealed, repaired, or replaced.
Installing central air without existing ductwork can add major cost because the job needs duct design, supply runs, returns, insulation, access work, and possibly wall or ceiling repairs. Compare this against ductless mini split or heat pump options before treating one bid as the market price.
Replace or repair ductwork when leakage, undersized returns, damage, poor insulation, or airflow problems would make the new system perform badly. Do not approve duct replacement only because it is bundled; ask for inspection notes and itemized scope.
Clear HVAC Costs uses a planning model based on home size, partial or full replacement, installation location, access, insulation, and return-air changes. The home-size table shows an accessible-space baseline; the calculator adjusts that baseline for the selected conditions, including minimum project allowances and rounding to the nearest $100. These are modeled allowances, not a survey of completed installations. Compare at least three written bids with the same removal, materials, supplies, returns, insulation, sealing, testing, and finish-repair scope.
Model example: For a 2,000 sq ft full-home replacement in an attic, with standard access, insulation included, and no return-air changes, the base range is $4,500–$11,500. The attic adjustment is 1.15×: $4,500 × 1.15 = $5,175 and $11,500 × 1.15 = $13,225. Rounded to the nearest $100, the displayed range is $5,200–$13,200. This illustrates the existing model, not an actual contractor quote or a measured local average.
For technical design, ask how the contractor determined room loads and duct sizes. The ACCA technical manuals describe Manual J for residential load calculations; Manual D addresses residential duct design. These resources explain design methods; they do not validate the dollar amounts in this estimator. Last updated October 29, 2026.