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 repairs 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.
| 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. |
| Home size | Partial replacement | Full replacement |
|---|---|---|
| 1,200 sq ft | $1,300 - $3,300 | $3,500 - $6,900 |
| 1,600 sq ft | $1,800 - $4,400 | $3,600 - $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. |
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 organizes ductwork estimates by replacement scope, home size, access, and quote risk. Ranges are planning estimates for U.S. homeowners and should be checked against at least three itemized contractor bids. Last updated June 1, 2026.
