California · HVAC
Ductwork Replacement cost in California
Statewide pricing, permit posture and inspection sequence for ductwork replacement in California. Your city or county issues the actual permit — use the local links below to confirm fees.
Verified August 2026
Ductwork Replacement cost in California
$3,300 – $15,700
Most California homeowners pay around $7,100, or $350–$800 per supply run. Permit fees typically add $130–$465.
Permit: Yes. California Residential Code (Title 24, Part 2.5) plus the Title 24 energy standards
Cost breakdown
| Budget scope | $3,300 |
|---|---|
| Typical project | $7,100 |
| Premium / complex | $15,700 |
| per supply run | $350 – $800 |
| Permit fees | $130 – $465 |
| vs national baseline | +31% |
| Timeline | 1-3 days of work, 1-3 weeks including permitting |
What is different about ductwork replacement in California
Title 24 energy compliance, seismic detailing and the highest permit fees in the country make California the most expensive state to permit a project in, even before labor.
Owner-builder: Owner-builder permits allowed, with strict limits when the home is sold within a year. 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.