Montana · HVAC
Ductwork Replacement cost in Montana
Statewide pricing, permit posture and inspection sequence for ductwork replacement in Montana. Your city or county issues the actual permit — use the local links below to confirm fees.
Model reviewed August 2026
Ductwork Replacement cost in Montana
$2,500 – $12,200
Most Montana homeowners pay around $5,500, or $250–$600 per supply run. Permit fees typically add $80–$280.
Permit: Yes. Montana Residential Code, based on the IRC, where adopted locally
Cost breakdown
| Budget scope | $2,500 |
|---|---|
| Typical project | $5,500 |
| Premium / complex | $12,200 |
| per supply run | $250 – $600 |
| Permit fees | $80 – $280 |
| vs national baseline | +1% |
| Timeline | 1-3 days of work, 1-3 weeks including permitting |
What is different about ductwork replacement in Montana
Bozeman and Whitefish price like resort markets while the rest of the state prices well below the national baseline; snow load drives structural scope statewide.
Owner-builder: Owner-builder permits common. 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
Ductwork pricing by city
Permit difficulty by city
Hometriva Permit Complexity Index: review load, added discipline reviews, wind and flood overlays, and how each jurisdiction sets fees.
What Montana homeowners reported paying
Invoice amounts submitted for this state, shown beside the model.
Rebates and incentives in Montana
What is still claimable, what expired, and where to check your own utility territory.
Federally funded, state-administered rebates for heat pumps, panel and wiring upgrades, insulation and whole-home retrofits. Availability, income tiers and funding depend entirely on the state program and can pause when a state's allocation runs out.
U.S. DOE — Home Energy Rebates- DSIRE — every Montana incentive by ZIPThe N.C. Clean Energy Technology Center database. The authoritative list of state, utility and local programs.
- ENERGY STAR rebate finderUtility and manufacturer rebates by ZIP code for HVAC, water heating and appliances.
- DOE Home Energy Rebates — Montana statusShows whether the state's HEAR/HOMES program is open, waitlisted or not yet launched.
Frequently asked questions
Do I need a permit for ductwork replacement in Montana?
In most jurisdictions this work is permitted and inspected. Requirements are set locally, so confirm the current application and inspection checklist with your building department before work starts.
How long does ductwork replacement take?
1-3 days of work, 1-3 weeks including permitting. Permit review and inspection scheduling are usually the largest source of variation.
What changes the price the most?
The largest cost drivers are number of supply and return runs; flex duct versus rigid sheet metal; attic access and clearance.
Sources
Sources & verification
Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.