Ductwork Replacement Cost Calculator
Last updated: October 15, 2026
Estimate HVAC ductwork replacement cost from conditioned area, unit rate, demolition, access difficulty, sealing, repairs, permits and contingency.
Starting figures illustrate this model. Enter your own measurements, quoted costs and applicable terms; this page does not retrieve live prices or provider rates.
Estimated ductwork replacement cost
—
- New ductwork before access adjustment: —
- Access-adjusted ductwork cost: —
- Removal, sealing and repairs: —
- Contingency: —
On this page
Quick summary: Estimate HVAC ductwork replacement cost from conditioned area, unit rate, demolition, access difficulty, sealing, repairs, permits and contingency.
Read the complete guide
Updated reference sections in this guide are in English.
What this calculator estimates
Estimate HVAC ductwork replacement cost from conditioned area, unit rate, demolition, access difficulty, sealing, repairs, permits and contingency.
How to use it
Enter Conditioned floor area (sq ft); New ductwork cost per sq ft ($); Old duct removal and disposal ($); Attic or crawlspace access factor; Air sealing and performance testing ($); Drywall and finish repairs ($); Permits and inspections ($); Contingency (%). Select Calculate to update the results.
How the calculation works
Conditioned area is multiplied by the entered unit rate and adjusted for access difficulty. Removal, sealing, repairs, permits and contingency are added.
Worked example: starting scenario
| Conditioned floor area (sq ft) | 2200 |
|---|---|
| New ductwork cost per sq ft ($) | 5.5 |
| Old duct removal and disposal ($) | 1800 |
| Attic or crawlspace access factor | 1.2 |
| Air sealing and performance testing ($) | 1200 |
| Drywall and finish repairs ($) | 900 |
| Permits and inspections ($) | 300 |
| Contingency (%) | 10 |
| Estimated ductwork replacement cost | $20,592.00 |
|---|---|
| New ductwork before access adjustment | $12,100.00 |
| Access-adjusted ductwork cost | $14,520.00 |
| Removal, sealing and repairs | $4,200.00 |
| Contingency | $1,872.00 |
Important limitations
Layout, duct type, asbestos, crawlspace height, zoning, registers, insulation, code and contractor minimums affect actual bids.