Plumbing Work Permit Requirements in Great Falls, MT
Montana enforces the 2021 IRC statewide. Building Safety Division located in Civic Center, Room 112. Only 1 viable city in this metro; Malmstrom AFB area is not an independent municipality.
By Joey, Founder · Last verified March 28, 2026 · How we research →
When you don’t need a Plumbing permit in Great Falls
Replacing a plumbing fixture in the same location does not require a permit.
When you need a Plumbing permit in Great Falls
Adding a new plumbing fixture requires a plumbing permit.
Replacing or installing a water heater requires a plumbing permit.
Rerouting plumbing lines requires a plumbing permit.
What Makes Great Falls Different
Here's how Great Falls's plumbing work rules stack up against the standard IRC baseline that most of the country follows.
Stricter Than the IRC
Adding a new plumbing fixture requires a plumbing permit.
Replacing or installing a water heater requires a plumbing permit.
Rerouting plumbing lines requires a plumbing permit.
1 rule match the IRC baseline, no surprises there.
Plumbing Work Permit Costs: Great Falls vs. Nearby
Great Falls's fees are right in line with the Montana average, $45 – $360 versus $53 – $200 statewide.
| City | Estimated Fee |
|---|---|
| Great Falls | $45 – $360 |
| Billings | $50 – $400 |
| Missoula | $52 – $420 |
| Bozeman | $55 – $440 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Great Falls permit costs →
Zoning & HOA Considerations
If you live in an HOA community: plumbing work is generally interior and does not require HOA approval. However, exterior plumbing changes (new cleanouts, sewer line work, visible piping) may need review in some communities.
Estimated Project Timeline in Great Falls
Here's a typical timeline for a plumbing work project in Great Falls, MT:
Timeline is based on Great Falls's typical about 2 weeks permit processing time. Actual timelines vary by project complexity, completeness of application, and current department workload.
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Frequently Asked Questions
Estimated permit fees for Plumbing Work projects in Great Falls, MT range from $45 – $360. Fees vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Plumbing Work projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit in Great Falls can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Typical approval time for Plumbing Work permits in Great Falls is about 1 week. More complex projects may take longer if plan review is required.
If you live in an HOA community, you may need architectural review approval in addition to a building permit. HOA rules and city building codes are separate, you may need to satisfy both. Review your CC&Rs and submit to your HOA's architectural review committee before starting work.
Learn More About Plumbing Work Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Plumbing Work Guide →