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Residential Addition / Remodel / Alteration Permit in Missoula, Montana

Required for room additions, structural alterations, and remodels affecting structural, mechanical, electrical, or plumbing systems on existing single-family and duplex dwellings within Missoula city limits.

Verified 2026-07-02 · Source

When you need this permit

  • Apply online through Accela Citizen Access
  • Interior remodels involving wall changes or fixture relocation require a building permit
  • Storage buildings/garages exceeding 200 sq ft require a permit
  • Retaining walls over 4 feet tall require a permit
  • Plans must comply with the 2021 IRC/IBC and 2021 IECC as amended by the State of Montana

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same table as new construction)City of Missoula FY26 Building Permit and Plan Review Fee Schedule (Resolution 8887, effective Jan 1–Dec 31, 2026)
$36 minimum (valuation $1–$500) up to $1,582 for the first $100,000 plus $9.94 per additional $1,000; see full valuation table
Plan Review FeeCity of Missoula FY26 Building Permit and Plan Review Fee Schedule
30% of the Building Permit Fee

Review timeline

Plan reviewMissoula’s published plan-review target
2–84 business days

How long did your Residential Addition / Remodel / Alteration Permit permit actually take in Missoula?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Framing/Structural

    After framing complete, before wall cover

  2. 2

    MEP Rough-In

    Mechanical, electrical, plumbing rough-ins before wall cover; separate trade permits required

  3. 3

    Final

    Required on all permits

See the full Missoula inspection guide — scheduling & re-inspection fees →

Tips

  • Interior remodels not touching walls or fixtures (paint, flooring, cabinetry, countertops) do not require a permit per the City's Building Permit FAQ.
  • Window replacements matching the original size and type do not require a permit.
  • Free-standing decks 30 inches or less above grade, under 200 sq ft, without a roof, and not serving as primary egress do not require a permit — any deck exceeding these thresholds does.
  • Storage sheds under 200 sq ft do not require a permit; sheds/garages at or over 200 sq ft do.

Frequently asked questions

Yes, if the work involves wall changes, fixture relocation, or new mechanical/electrical/plumbing work. Apply online through Accela Citizen Access.

In Missoula, the published Building Permit Fee — valuation-based (same table as new construction) is: $36 minimum (valuation $1–$500) up to $1,582 for the first $100,000 plus $9.94 per additional $1,000; see full valuation table. Additional published fees: Plan Review Fee — 30% of the Building Permit Fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Missoula's published plan-review target for a residential addition / remodel / alteration permit is 2–84 business days.

You'll need: Building Permit Application (Accela Citizen Access); Construction Drawings. See the required-documents checklist on this page for details on each.

Missoula requires 3 inspection(s) for a residential addition / remodel / alteration permit, in order: Framing/Structural, MEP Rough-In, Final. Schedule each through City of Missoula Development Services — Building Division (Community Planning, Development & Innovation) ((406) 552-6630).

Apply through City of Missoula Development Services — Building Division (Community Planning, Development & Innovation) at 435 Ryman St., Missoula, MT 59802. Phone: (406) 552-6630, email: BLDG@ci.missoula.mt.us. Office hours: Permit/application questions: Mon–Fri 9:00 AM–4:00 PM, (406) 552-6060, coordinators@ci.missoula.mt.us. Building code questions: Mon–Fri 8:00 AM–5:00 PM, (406) 552-6630, BLDG@ci.missoula.mt.us. Inspection scheduling: (406) 552-6040 or text (888) 413-4439.. Official information: https://www.ci.missoula.mt.us/3202/Building-Division.

Missoula, Montana has adopted: 2021 International Building Code (IBC) — as amended by the State of Montana; effective in Missoula September 1, 2022 per Missoula Municipal Code (MMC) 15.04.010; 2021 International Residential Code (IRC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 International Mechanical Code (IMC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 International Fuel Gas Code (IFGC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 International Existing Building Code (IEBC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 International Energy Conservation Code (IECC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 International Swimming Pool and Spa Code (ISPSC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 Uniform Plumbing Code (UPC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2020 National Electrical Code (NEC) — as amended by the State of Montana; effective September 1, 2022 per MMC 15.04.010; 2021 Wildland Urban Interface Code — statewide adoption by the Montana Building Codes Bureau, Administrative Rules of Montana (ARM) Title 24, Chapter 301. Local amendments apply — see the Missoula overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-02.

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 Missoula building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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