Connecticut · HVAC
Ductwork Replacement cost in Connecticut
Statewide pricing, permit posture and inspection sequence for ductwork replacement in Connecticut. Your city or county issues the actual permit — use the local links below to confirm fees.
Verified August 2026
Ductwork Replacement cost in Connecticut
$3,000 – $14,300
Most Connecticut homeowners pay around $6,400, or $300–$700 per supply run. Permit fees typically add $105–$370.
Permit: Yes. Connecticut State Building Code, based on the IRC
Cost breakdown
| Budget scope | $3,000 |
|---|---|
| Typical project | $6,400 |
| Premium / complex | $14,300 |
| per supply run | $300 – $700 |
| Permit fees | $105 – $370 |
| vs national baseline | +19% |
| Timeline | 1-3 days of work, 1-3 weeks including permitting |
What is different about ductwork replacement in Connecticut
Older housing stock means knob-and-tube, asbestos and undersized services surface constantly; budget for discovery work that newer-stock states rarely hit.
Owner-builder: Homeowners may permit work on a single-family home they occupy. Ductwork Replacement generally requires a licensed contractor to pull the permit, even where owner-builder status is available.
Inspections
- Duct rough-in
- Duct leakage test
- Final mechanical inspection
What drives the price
- Number of supply and return runs
- Flex duct versus rigid sheet metal
- Attic access and clearance
- Return air sizing corrections
- Removal of contaminated duct board
Frequently asked questions
Does duct replacement need a permit in Florida?
Yes. Replacing a duct system requires a mechanical permit and a duct leakage test in most Florida jurisdictions, because duct leakage is regulated under the energy code.
Sources
Sources & verification
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.