What are the Commercial Mechanical & HVAC permit rules in Montana?

Montana enforces trade permit fee schedules determined by local AHJ building departments per county. General contractors and sub-trades must maintain active state licenses and bond filings ($10,000–$50,000).

Are sub-trade contractor surety bonds required in Montana?

Yes. Most Montana municipal building departments require trade contractors to file an active license bond prior to permit issuance.

❄️ STATEWIDE TRADE HUB (MT) 1 County Workstations

Montana Commercial Mechanical & HVAC Permit Guide

HVAC tonnage rates, ductwork submittals, rooftop replacements, and COMcheck forms. Compare municipal fee structures, plan check add-on rates, and contractor bond thresholds across Montana.

Montana Commercial Mechanical & HVAC County Workstations

Select a county building department to calculate exact trade permit fees & bond rules

Yellowstone County

City of Billings Building Division

2026 Verified

Plan Review Rate: 40%

Tech Surcharge: 4%

Mandatory Surety Bond: $10,000

Open Yellowstone County Commercial Mechanical & HVAC Workstation →