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Codes, exemptions & field inspections

Build to the adopted code. Verify every exception.

This guide translates the available agency record into a preconstruction checklist for structural scope, minor work, and inspection release. The adopted code and the issuing official control when a field condition is disputed.

Regulatory framework

The code baseline for Blaine County.

Montana’s current 2026 code set: 2021 International Building Code, 2021 International Residential Code, 2021 International Existing Building Code, 2021 International Mechanical Code, 2021 International Fuel Gas Code, 2021 International Energy Conservation Code, 2021 Uniform Plumbing Code, 2020 National Electrical Code, 2021 International Swimming Pool and Spa Code, and 2021 Wildland-Urban Interface Code, as amended by ARM Title 24, Chapter 301.

Inspection lane

For covered work outside certified local jurisdictions, contact the Montana Building Codes Bureau at (406) 841-2056 for permit and inspection instructions. For floodplain work, contact Blaine County’s contracted floodplain manager, WWC Engineering, at (406) 443-3962; the county directory also lists subdivision planning contacts.

Minor-work playbook

Understand what may be exempt—and what is not.

At the state level, farm or ranch buildings, mine buildings on the mine site, petroleum refineries and pulp/paper mills except office/shop buildings, private homes or apartments with four or fewer dwelling units that do not serve transient guests, and private garages/storage buildings used only by the owner are generally exempt. A Blaine County floodplain permit is still required before development in a regulated floodplain, and county subdivision/site requirements can apply.

Field rule

A permit exemption generally addresses one narrow construction trigger. It does not automatically waive zoning, land-use, floodplain, shoreline, fire, energy, electrical, utility, septic, or right-of-way requirements. Obtain written confirmation when the project involves a new structure, structural alteration, change in occupancy, or concealed work.

Inspection pipeline

Keep the work visible at every release point.

  1. 1

    Request with lead time

    For covered work outside certified local jurisdictions, contact the Montana Building Codes Bureau at (406) 841-2056 for permit and inspection instructions. For floodplain work, contact Blaine County’s contracted floodplain manager, WWC Engineering, at (406) 443-3962; the county directory also lists subdivision planning contacts.

  2. 2

    Preserve access

    Do not cover framing, reinforcement, wiring, piping, damp-proofing, or life-safety work until the required inspection has been completed and documented.

  3. 3

    Close the record

    Retain the approved plans, inspection approvals, correction responses, and final certificate or occupancy release with the property file.

Contractor verification

Verify the builder before the contract is signed.

Use the state licensing system to verify active registration, trade credentials, bond status, and liability coverage where available. Match the legal business name to the proposal and permit application.

No verified lookup link

Planning reference

Keep the parcel rules beside the building plans.

A building permit is only one part of statutory compliance. Check the local zoning, ordinance, map, or land-use reference before finalizing setbacks, height, lot coverage, access, drainage, or accessory structure placement.

Open planning reference ↗

Source trail

Official sources for this profile

Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.

Agency websiteOpen official source ↗Permit portalOpen official source ↗Planning or zoning referenceOpen official source ↗

Project questions

Frequently asked questions for Blaine County

Who handles permitting for this jurisdiction?

This record is marked State Fallback. Confirm whether a city, state agency, or other local authority controls the parcel before filing.

How should I begin an application?

Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact (406) 841-2056 (State Building Codes Bureau); (406) 443-3962 (Blaine County Floodplain Management/WWC Engineering).

How long might review take?

The Montana Building Codes Bureau states that plan review averages three weeks; issuance follows resolution of comments and payment of fees.

How are inspections scheduled?

For covered work outside certified local jurisdictions, contact the Montana Building Codes Bureau at (406) 841-2056 for permit and inspection instructions. For floodplain work, contact Blaine County’s contracted floodplain manager, WWC Engineering, at (406) 443-3962; the county directory also lists subdivision planning contacts.

Which codes and exemptions should I review?

Montana’s current 2026 code set: 2021 International Building Code, 2021 International Residential Code, 2021 International Existing Building Code, 2021 International Mechanical Code, 2021 International Fuel Gas Code, 2021 International Energy Conservation Code, 2021 Uniform Plumbing Code, 2020 National Electrical Code, 2021 International Swimming Pool and Spa Code, and 2021 Wildland-Urban Interface Code, as amended by ARM Title 24, Chapter 301. At the state level, farm or ranch buildings, mine buildings on the mine site, petroleum refineries and pulp/paper mills except office/shop buildings, private homes or apartments with four or fewer dwelling units that do not serve transient guests, and private garages/storage buildings used only by the owner are generally exempt. A Blaine County floodplain permit is still required before development in a regulated floodplain, and county subdivision/site requirements can apply.

Field sequencing matters

The inspector needs to see the work at the right moment.

Code compliance is not only a plan-review exercise. Footings, reinforcement, framing, fireblocking, wiring, piping, insulation, weather protection, and life-safety systems each have points where the work must remain accessible. Build the inspection calendar into the trade schedule instead of treating it as a final administrative step.

When a project qualifies for a narrow minor-work exemption, keep a written explanation of why it qualifies and confirm that related zoning, utility, fire, energy, or environmental rules do not create a separate approval requirement.

Closeout file

Keep the approved plan set, inspection approvals, correction responses, contractor license verification, final certificate, and any occupancy release together. A clean record protects the owner, builder, lender, insurer, and future buyer.