🛁 Bathroom Remodel permit in Montana
Renovating a bathroom — fixtures, tiling, ventilation, and sometimes relocating plumbing. Here is the Montana-specific rule: who issues it, typical fees, timeline, go / no-go, and the official source to verify.
Bathroom Remodel permit in Montana
The Montana rule for a bathroom remodel, with fee range, timeline, go / no-go, and the official source.
Montana
🛁 Bathroom Remodel
Exact permit fees are set by the local building department. WikEst shows the published or code-based range where one exists, linked to its official source — verify the final amount at the source before budgeting.
🛁 Bathroom Remodel permit fee in Montana
ConditionalGenerally allowedcity authority
Permit fee range
Where enforced, a building permit plus trade permits apply; verify locally.
Typical timeline
Where enforced, typically several weeks for full plan review.
Setback
—
Exempt if
Not size-exempt
Relocating plumbing/electrical or moving walls requires a permit where a code is enforced. In non-certified areas, single-family homes are exempt from the state building permit but trade permits are still required.
Official sources: MT Dept. of Labor & Industry — Building Codes Program · City of Missoula — Development Services (Plan a Project)
Representative cities for Montana: Billings, Missoula.
All 20 project fee ranges in Montana
Official-source ranges where published; “By local jurisdiction” means no flat fee is published and the amount is set case by case.
| Project | Permit? | Authority | Fee range | Go / no-go |
|---|---|---|---|---|
| 🏠 Accessory Dwelling Unit (ADU) | conditional | city | Where a certified city/county enforces, fees follow that jurisdiction; in non-certified areas a single-family home is exempt from the state building permit (trade permits still apply). Verify locally. | case-by-case |
| 🪵 Deck / Porch | conditional | city | Where enforced, fees follow the local schedule; verify locally. | allowed |
| 🧱 Fence / Wall | conditional | city | Where enforced, fencing permits apply above local height limits; verify locally. | allowed |
| 🛖 Shed / Outbuilding | conditional | city | Where enforced, small detached sheds may be exempt; verify locally. | allowed |
| 🪜 Basement Finish | conditional | city | Where a certified city enforces, a building permit fee applies; in non-certified areas the state building permit is exempt for single-family homes (trade permits still apply). Verify locally. | allowed |
| 🚗 Garage / Carport | conditional | city | Where enforced, attached garages (additions) are permitted; verify locally. | allowed |
| ☀️ Rooftop Solar PV | yes | state | Electrical permit required statewide by the MT DLI Building Codes Program (NEC); local jurisdictions may also be involved. | allowed |
| 🌡️ HVAC Replacement | yes | state | Mechanical permit required statewide by the MT DLI Building Codes Program; licensed contractors perform the work. | allowed |
| 🍳 Kitchen Remodel | conditional | city | Where enforced, a building permit plus trade permits apply; verify locally. | allowed |
| 🛁 Bathroom Remodel | conditional | city | Where enforced, a building permit plus trade permits apply; verify locally. | allowed |
| 🏗️ Room Addition | conditional | city | Where a certified city enforces, a building permit based on valuation applies; in non-certified areas the state building permit is exempt for single-family homes (trade permits still apply). Verify locally. | allowed |
| 🪟 Window / Door Replacement | conditional | city | Where enforced, a permit fee applies if enlarging the opening; in-kind swap often exempt. Verify locally. | allowed |
| 🏘️ Roof Replacement | conditional | city | Where enforced, an in-kind re-roof may be exempt; structural deck replacement requires a permit. Verify locally. | allowed |
| 🅿️ Driveway / Parking Pad | conditional | city | No building permit for private flatwork where enforced; a right-of-way permit may be needed. Verify locally. | allowed |
| 🏊 Swimming Pool / Spa | conditional | city | Where enforced, a building permit plus barrier fencing applies; verify locally. | allowed |
| 🧱 Retaining Wall | conditional | city | Where enforced, a permit applies if over 4 ft; verify locally. | allowed |
| 💥 Demolition / Teardown | yes | city | Demolition permit fee set by the issuing authority; verify locally. | allowed |
| 🚰 Septic System | yes | county | Septic permit fee set by the local environmental/health authority; engineered systems cost more. | allowed |
| 🔌 EV Charger | conditional | city | Electrical permit; fee set by the issuing authority. | allowed |
| ⚡ Standby Generator | conditional | city | Mechanical/electrical permit; fee set by the issuing authority. | allowed |
Montana rule at a glance
Needs permit
conditional
Issuing authority
city
Typical fee
Where enforced, a building permit plus trade permits apply; verify locally.
Typical timeline
Where enforced, typically several weeks for full plan review.
Setback
—
Exempt if
Not size-exempt
Relocating plumbing/electrical or moving walls requires a permit where a code is enforced. In non-certified areas, single-family homes are exempt from the state building permit but trade permits are still required.
Official sources for this rule: MT Dept. of Labor & Industry — Building Codes Program · City of Missoula — Development Services (Plan a Project)
Frequently asked questions
Does a bathroom remodel need a permit in Montana?
In Montana, a bathroom remodel is conditional / size-dependent. Issuance is at the city level. Confirm the exact threshold with the local building department using the sources on this page.
Who issues the bathroom remodel permit in Montana?
Montana permits for this project are handled at the city level — usually the city or county building department. Use the county permit authority lookup to find the exact office for your property.
How much does a bathroom remodel permit cost in Montana?
Fees are set locally in Montana and are not a single statewide number. Open the official authority link on this page for the current schedule.
What exemptions apply to a bathroom remodel in Montana?
Baseline exemptions (e.g. small detached structures, low decks) may apply but Montana or your city can amend them. Verify with the local building department.
🗺️ All projects in Montana
The full Montana permit guide across 20 home projects.
📊 Bathroom Remodel in every state
Compare the bathroom remodel rule across all U.S. states.
Bathroom Remodel in other states
| State | Permit? | Authority | Typical fee | Timeline | Go / No-Go | Key notes |
|---|---|---|---|---|---|---|
| California | Permit required | city | Building + plumbing + electrical fees. Verify with the city building department. | 2–6 weeks. | Generally allowed | Ventilation (Title 24) and waterproofing are required; relocating plumbing needs permits. Exempt: N/A |
| Texas | Permit required | city | Building + plumbing + electrical fees. Verify with the city building department. | 2–6 weeks. | Generally allowed | Plumbing/electrical relocation requires permits. Exempt: N/A |
| Florida | Permit required | city | Building + plumbing + electrical fees. Verify with the city building department. | 2–6 weeks. | Generally allowed | Plumbing/electrical relocation requires permits. Exempt: N/A |
| New York | Permit required | city | Building + plumbing + electrical fees. Verify with the city building department. | NYC: ALT2 review, several weeks. | Restricted | NYC: bathroom renovation needs an ALT2 permit filed by a NYS-licensed PE or RA; fixture-only swaps may be exempt. Exempt: N/A |
| Pennsylvania | Permit required | city | Building permit fee; trade permits (plumbing/electrical) billed separately. | — | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Illinois | Permit required | city | Building permit fee; trade permits billed separately. | — | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Ohio | Permit required | city | Building permit fee; Columbus minimum $125, trade permits billed separately. | — | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Georgia | Permit required | city | Building permit fee; Atlanta minimum $150 plus $25 fee, trade permits billed separately. | — | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| North Carolina | Permit required | city | Building + trade permits based on valuation; verify with the city. | Plan review typically 1–3 weeks plus trade inspections. | Generally allowed | Bathroom remodels that move fixtures, add ventilation, or alter plumbing/electrical require permits. Exempt: Any fixture relocation or new wet wall requires a permit. |
| Michigan | Permit required | city | Building + trade permits based on valuation; verify with the city. | Plan review typically 1–3 weeks plus trade inspections. | Generally allowed | Bathroom remodels that move fixtures, add ventilation, or alter plumbing/electrical require permits. Exempt: Any fixture relocation or new wet wall requires a permit. |
| New Jersey | Permit required | city | Construction + trade permits based on valuation; verify with the city. | Plan review commonly up to 20 business days plus trade inspections. | Generally allowed | Bathroom remodels that move fixtures, add ventilation, or alter plumbing/electrical require permits. Exempt: Any fixture relocation or new wet wall requires a permit. |
| Virginia | Permit required | city | Building + trade permits based on valuation; verify with the city. | Plan review ~10 business days plus trade inspections. | Generally allowed | Bathroom remodels that move fixtures, add ventilation, or alter plumbing/electrical require permits. Exempt: Any fixture relocation or new wet wall requires a permit. |
| Washington | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation must meet code; exhaust to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Arizona | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Massachusetts | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Tennessee | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Indiana | Permit required | city | Building permit fee; trade permits (plumbing/electrical) billed separately. | — | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Missouri | Permit required | city | Building permit fee; trade permits (plumbing/electrical) billed separately. | Varies by municipality — typically several weeks for full plan review. | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Maryland | Permit required | city | Building permit fee; trade permits billed separately. | — | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. |
| Wisconsin | Permit required | city | Building permit fee; trade permits (plumbing/electrical) billed separately. | Varies by municipality — typically several weeks for full plan review. | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Alaska | Conditional | city | Valuation-based when plumbing is relocated. | — | Generally allowed | Ventilation to the exterior is required; freeze protection for plumbing is reviewed. |
| Alabama | Conditional | city | Valuation-based when plumbing is relocated. | — | Generally allowed | Ventilation to the exterior is required. |
| Arkansas | Conditional | city | Valuation-based; Little Rock minimum building-permit fee $50 (work over $5,000 or requiring inspection). | — | Generally allowed | Ventilation to the exterior is required. |
| Colorado | Conditional | city | Valuation-based when plumbing is relocated. | — | Generally allowed | Ventilation to the exterior is required. |
| Connecticut | Conditional | city | Valuation-based when plumbing is relocated. | — | Generally allowed | Ventilation to the exterior is required. |
| Delaware | Conditional | county | Valuation-based when plumbing is relocated. | — | Generally allowed | Ventilation to the exterior is required. |
| Hawaii | Conditional | county | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Verify with the county building department. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Iowa | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required; new basement baths need egress. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Idaho | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Verify with the local building department. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Kansas | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Kentucky | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Louisiana | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Maine | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Licensed plumber needed for plumbing permits in Maine. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Minnesota | Permit required | city | Building permit fee; trade permits (plumbing/electrical) billed separately. | Varies by municipality — typically several weeks for full plan review. | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| Mississippi | Conditional | city | Where enforced, a building permit plus trade permits apply; verify locally. | Varies by jurisdiction. | Generally allowed | Relocating plumbing/electrical or moving walls requires a permit where a code is enforced. Cosmetic-only updates may be exempt. Confirm locally. |
| North Dakota | Conditional | city | — | — | Generally allowed | Exterior ventilation is required; plumbing permits go through the State Plumbing Board (or local AHJ where enforcing). Exempt: Fixture-for-fixture swap in place is often exempt. |
| Nebraska | Permit required | city | Building permit fee; trade permits (plumbing/electrical) billed separately. | Varies by municipality — typically several weeks for full plan review. | Generally allowed | A permit is required when relocating plumbing/electrical, moving walls, or changing fixtures. Cosmetic-only updates may be exempt. |
| New Hampshire | Conditional | city | — | — | Generally allowed | Exterior ventilation is required. Licensed plumbers must pull the plumbing permit. Exempt: Fixture-for-fixture swap in place is often exempt. |
| New Mexico | Conditional | city | — | — | Generally allowed | Exterior ventilation is required. CID-licensed plumbers pull the plumbing permit. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Nevada | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required; water-conservation fixtures are encouraged (Truckee Meadows Water Authority rebates). Exempt: Fixture-for-fixture swap in place is often exempt. |
| Oklahoma | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior required; plumbing under IPC 2018 with OK amendments. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Oregon | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior required; plumbing under the Oregon Plumbing Specialty Code. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Rhode Island | Conditional | city | Valuation-based when plumbing is relocated (statewide formula, $125 min). | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior required; plumbing under the Rhode Island State Plumbing Code. Exempt: Fixture-for-fixture swap in place is often exempt. |
| South Carolina | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior required; plumbing under the 2021 IPC with SC modifications. Exempt: Fixture-for-fixture swap in place is often exempt. |
| South Dakota | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required; licensed plumbers are required for plumbing permits statewide. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Utah | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior and GFCI protection are required; Utah energy code may apply to alterations. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Vermont | Conditional | city | Valuation-based when plumbing is relocated, where enforced. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior and GFCI protection are required; RBES may apply to alterations. Exempt: Fixture-for-fixture swap in place is often exempt. |
| West Virginia | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior and GFCI protection are required; Charleston issues plumbing permits for relocations. Exempt: Fixture-for-fixture swap in place is often exempt. |
| Wyoming | Conditional | city | Valuation-based when plumbing is relocated, where enforced. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior and GFCI protection are required; verify locally. Exempt: Fixture-for-fixture swap in place is often exempt. |