🪟 Window / Door Replacement permit in Montana
Replacing existing windows or exterior doors in the same opening (in-kind swap). Here is the Montana-specific rule: who issues it, typical fees, timeline, go / no-go, and the official source to verify.
Window / Door Replacement permit in Montana
The Montana rule for a window / door replacement, with fee range, timeline, go / no-go, and the official source.
Montana
🪟 Window / Door Replacement
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.
🪟 Window / Door Replacement permit fee in Montana
ConditionalGenerally allowedcity authority
Permit fee range
Where enforced, a permit fee applies if enlarging the opening; in-kind swap often exempt. Verify locally.
Typical timeline
Where enforced, in-kind swaps often same-day.
Setback
—
Exempt if
Not size-exempt
Exempt criteria: Where a code is enforced, in-kind window/door replacement in the same opening is generally exempt.
Enlarging or adding openings requires a permit where a code is enforced. Confirm locally.
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 permit fee applies if enlarging the opening; in-kind swap often exempt. Verify locally.
Typical timeline
Where enforced, in-kind swaps often same-day.
Setback
—
Exempt if
Not size-exempt
Enlarging or adding openings requires a permit where a code is enforced. Confirm locally.
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 window / door replacement need a permit in Montana?
In Montana, a window / door replacement 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 window / door replacement 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 window / door replacement 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 window / door replacement 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.
📊 Window / Door Replacement in every state
Compare the window / door replacement rule across all U.S. states.
Window / Door Replacement in other states
| State | Permit? | Authority | Typical fee | Timeline | Go / No-Go | Key notes |
|---|---|---|---|---|---|---|
| California | Conditional | city | Permit fee if changing the opening; in-kind swap is often Over-the-Counter. | SF: same-day Over-the-Counter in-kind replacement. | Generally allowed | Changing the opening size or adding egress windows requires a permit; replacement must meet the energy code. Exempt: In-kind replacement (same size/location) typically needs no permit. |
| Texas | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Same day / Over-the-Counter where required. | Generally allowed | Enlarging openings or adding egress windows requires a permit. Exempt: In-kind same-size replacement generally needs no permit. |
| Florida | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Same day / Over-the-Counter where required. | Restricted | In the HVHZ (Miami-Dade, Broward) windows within 1 mile of the coast must be impact-rated / Florida Product-Approved. Enlarging openings needs a permit. Exempt: In-kind same-size replacement generally needs no permit. |
| New York | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Same day / Over-the-Counter where required. | Generally allowed | Enlarging openings or changes to means of egress need a permit (NYC PE/RA filing). Exempt: In-kind same-size replacement generally needs no permit. |
| Pennsylvania | Conditional | city | — | — | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| Illinois | Conditional | city | — | — | Generally allowed | Swapping windows or exterior doors in the same opening is usually permitted via an expedited process; enlarging openings requires a full permit. |
| Ohio | Conditional | city | Columbus minimum permit fee $125 where a permit is required. | — | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| Georgia | Conditional | city | Atlanta minimum permit cost $150 plus $25 fee where a permit is required. | — | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| North Carolina | Conditional | city | Building permit (alteration) where required; verify with the city. | Often 1–2 weeks; many window jobs are issued without plan review. | Generally allowed | Raleigh lists windows/doors/siding as alterations needing a permit; in-kind replacements in the same opening are commonly exempt. Exempt: In-kind replacement in the same opening is often exempt. |
| Michigan | Conditional | city | Building permit (alteration) where required; verify with the city. | Often 1–2 weeks; many window jobs are issued without plan review. | Generally allowed | Replacing windows/doors in the same opening is typically exempt; enlarging an opening or cutting a new one requires a permit. Exempt: In-kind replacement in the same opening is often exempt. |
| New Jersey | Conditional | city | Construction permit where required; verify with the city. | Often 1–2 weeks; many same-opening swaps are exempt. | Generally allowed | Same-size window/door swaps are exempt; enlarging an opening (new header/lintel) requires a UCC permit. Pre-1978 homes trigger EPA Lead RRP rules. Exempt: In-kind replacement in the same opening is exempt (ordinary maintenance). |
| Virginia | Conditional | city | Building permit where required; verify with the city. | Often 1–2 weeks; many same-opening swaps are exempt. | Generally allowed | Same-size window/door swaps are exempt; converting a window to a door or enlarging an opening requires a permit. Exempt: In-kind replacement in the same opening is exempt (ordinary repair). |
| Washington | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement windows should meet U-factor requirements when the energy code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Arizona | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Massachusetts | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products must meet energy/stretch-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Tennessee | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged or under stricter local codes. | In-kind swaps typically need no review; Nashville requires a permit for window/door/exterior changes. | Generally allowed | Replacement products must meet energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt under the baseline code. |
| Indiana | Conditional | city | — | — | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| Missouri | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Varies by municipality — in-kind swaps often same-day. | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. Kansas City exempts windows not exceeding 4 ft in load-bearing walls from plan review. |
| Maryland | Conditional | city | — | — | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging openings requires a permit. |
| Wisconsin | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Varies by municipality — in-kind swaps often same-day. | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| Alaska | Conditional | city | Usually no fee for in-kind swaps; a permit is needed if the opening is enlarged. | — | Generally allowed | Replacement products must meet the Alaska energy code when the code is triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| Alabama | Conditional | city | Usually no fee for in-kind swaps; a permit is needed if the opening is enlarged. | — | Generally allowed | Replacement products should meet the energy code when the code is triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| Arkansas | Conditional | city | Valuation-based; Little Rock minimum building-permit fee $50 (work over $5,000 or requiring inspection). | — | Generally allowed | Replacement products should meet the energy code when the code is triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| Colorado | Conditional | city | Usually no fee for in-kind swaps; a permit is needed if the opening is enlarged. | — | Generally allowed | Replacement products must meet the energy code when triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| Connecticut | Conditional | city | Usually no fee for in-kind swaps; a permit is needed if the opening is enlarged. | — | Generally allowed | Replacement products must meet the energy code when triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| Delaware | Conditional | county | Usually no fee for in-kind swaps; a permit is needed if the opening is enlarged. | — | Generally allowed | Replacement products must meet the energy code when triggered. Exempt: Same-size, in-kind window/door replacement is generally exempt. |
| Hawaii | Conditional | county | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Verify with the county building department. Exempt: Same-size, in-kind replacement is generally exempt. |
| Iowa | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Idaho | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Verify with the local building department. Exempt: Same-size, in-kind replacement is generally exempt. |
| Kansas | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor where an energy code is adopted. Exempt: Same-size, in-kind replacement is generally exempt. |
| Kentucky | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Louisiana | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review (Baton Rouge now requires a permit for window replacement). | Generally allowed | Replacement products must meet wind/impact and energy requirements in Louisiana. Exempt: Same-size, in-kind replacement is generally exempt; Baton Rouge requires a permit for window/door replacement. |
| Maine | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged or energy code triggered. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Verify with the Code Enforcement Officer. Exempt: Same-size, in-kind replacement is generally exempt. |
| Minnesota | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Varies by municipality — in-kind swaps often same-day. | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| Mississippi | Conditional | city | Where enforced, a permit fee applies if enlarging the opening; in-kind swap often exempt. Verify locally. | Varies by jurisdiction. | Generally allowed | Enlarging or adding openings requires a permit where a code is enforced. Confirm locally. |
| North Dakota | Conditional | city | — | — | Generally allowed | Replacement products should meet energy-code requirements when the code is triggered. Electrical/structural changes need separate permits. Exempt: Same-size, in-kind replacement is generally exempt. |
| Nebraska | Conditional | city | Permit fee if changing the opening; in-kind swap is often exempt. | Varies by municipality — in-kind swaps often same-day. | Generally allowed | Swapping windows or exterior doors in the same opening is generally exempt; enlarging or adding openings requires a permit. |
| New Hampshire | Conditional | city | — | — | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Licensed contractors pull trade permits. Exempt: Same-size, in-kind replacement is generally exempt. |
| New Mexico | Conditional | city | — | — | Generally allowed | Replacement products should meet energy-code requirements when the code is triggered. CID-licensed contractors pull trade permits. Exempt: Same-size, in-kind replacement is generally exempt. |
| Nevada | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt (IRC R105.2). |
| Oklahoma | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code (IECC 2006 state baseline) when the code is triggered; wind-borne-debris glazing may be required in higher hazard areas. Exempt: Same-size, in-kind replacement is generally exempt (IRC R105.2). |
| Oregon | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged or structurally changed. | In-kind swaps typically need no review. | Generally allowed | Replacement products must meet ORSC energy/glazing requirements when the code is triggered. Exempt: Replacing doors/windows with no structural changes is exempt (statewide). |
| Rhode Island | Conditional | city | Usually no fee for sash-only swap; permit needed for full frame-and-sash replacement or enlarged openings. | In-kind swaps typically need no review. | Generally allowed | Replacement products must meet RI energy-code (2024 IECC with RI amendments) U-factor when the code is triggered. Exempt: Replacement window sash installations are exempt; full frame-and-sash replacements require a permit. |
| South Carolina | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Coastal wind-borne-debris glazing may be required in designated regions; products must meet energy-code when triggered. Exempt: Same-size, in-kind replacement is generally exempt (2021 SC Residential Code R105.2). |
| South Dakota | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code requirements where the local code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Utah | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet Utah’s amended energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Vermont | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged, where enforced. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet RBES U-factor when the energy code is triggered (RBES is mandatory statewide). Exempt: Same-size, in-kind replacement is generally exempt. |
| West Virginia | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet state energy-code U-factor when the code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |
| Wyoming | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged, where enforced. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code requirements where the local code is triggered. Exempt: Same-size, in-kind replacement is generally exempt. |