Mechanical / HVAC Permit (State-Administered) in Miles City, Montana
VerifiedRequired for mechanical/HVAC work anywhere in Miles City and Custer County, including furnaces, gas piping, ventilation, and cooling equipment. Because Miles City holds no DLI Mechanical certification, this permit is issued directly by the Montana Department of Labor & Industry Building Codes Bureau (Helena) under the 2021 International Mechanical Code, not the city.
Verified 2026-07-03 · Source
When you need this permit
- Accurate location and owner information required for permitting; must indicate whether the job is located inside city limits
- Type of Building and Type of Work (New, Addition/remodel, Alteration) must be indicated
- Project Value must be provided; permit fee is calculated from the state's valuation-based fee schedule
- Description of work checklist covers air handling units, furnaces with ducts, repair/alteration of heating or cooling systems, ventilation systems, refrigeration work, appliance venting, gas piping, mechanical exhaust systems, evaporative coolers, and compressors
- Boiler work requires a separate Boiler Permit form, not the Mechanical Permit
- Apply in accordance with Title 50, Chapter 60, Section 104, MCA and ARM 24.301.172
Required documents
- Required
Application for Mechanical Permit
Montana Building Codes Bureau statewide form (BCP-1, Rev. 06/2022); mailed with payment to Department of Labor and Industry / BCB / PO Box 200517, Helena, MT 59620-0517, or filed online via ebiz.mt.gov
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Mechanical Permit — Project value $0-$10,000 | $48 for the first $1,000, plus $14 for each additional $1,000 or fraction thereof | Montana Building Codes Bureau, Application for Mechanical Permit (BCP-1, Rev. 06/2022), Fee Schedule |
| Mechanical Permit — Project value $10,001-$50,000 | $166 for the first $10,000, plus $9 for each additional $1,000 or fraction thereof | Application for Mechanical Permit (BCP-1, Rev. 06/2022), Fee Schedule |
| Mechanical Permit — Project value $50,001 or more | $514 for the first $50,000, plus $6 for each additional $1,000 or fraction thereof | Application for Mechanical Permit (BCP-1, Rev. 06/2022), Fee Schedule |
Review timeline
1–15 business days
Miles City’s published plan-review target
Inspection process
Tips
- Review timeline governed by the Montana DLI Building Codes Bureau's own published figure for state-administered permits: 'This process may take anywhere from a few hours to several weeks depending upon the bureau's work load, the size of the project and the number of items that must be modified to address the deficiencies noted on the plan review' (Building Permit FAQ). Because Miles City holds no Mechanical certification, mechanical permits are state-administered, so this DLI turnaround governs. The 1-15 working-day range reflects 'a few hours' (same/next working day) to 'several weeks' (~3 weeks ≈ 15 working days); complex or deficient submittals can run longer. Confirm current turnaround at (406) 841-2056.
- Mechanical permits in Miles City are issued by the STATE Building Codes Bureau in Helena, not the city — mail applications and payment to PO Box 200517, Helena, MT 59620-0517, or apply online at ebiz.mt.gov.
- Example from the state's own application form: a $9,460 furnace project costs $48 (first $1,000) + 9 x $14 (nine additional $1,000 fractions up to $9,000) = $174.00 total.
- Boiler installations use a separate Boiler Permit form, not this Mechanical Permit application.
Frequently asked questions
- Do I need a permit to replace my furnace in Miles City?
- Yes. Furnace replacement requires a state Mechanical Permit issued by the Montana Building Codes Bureau (not the city), since Miles City is not mechanically-certified. The fee is calculated from project value: $48 for the first $1,000 plus $14 per additional $1,000 or fraction thereof, up to $10,000.
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Miles City Building Department — official building department
- Application for Mechanical Permit (PDF, BCP-1, Rev. 06/2022)
- Montana Building Codes Bureau — Mechanical Permits
- Montana Building Codes Bureau — Building Permit FAQ (plan-review turnaround: 'a few hours to several weeks')
- Montana Building Codes Bureau — Certified City, County and Town Programs
Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Miles City building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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