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Change of Use / Certificate of Occupancy in Hamilton, Montana

Hamilton has no standalone Change of Use or Certificate of Occupancy application separate from its Commercial Building Permit. 'Change of Use' is one of the checkboxes under 'Proposed Work' on the Commercial Building Permit Application itself (alongside New Construction, Addition, Remodel, Re-side, Re-roof, Repair, and Other), and any interior alteration involving an occupancy change requires plans stamped by a Montana-licensed Professional Engineer or Architect. Occupancy is tracked in the permit's office-use section (Occupancy Type, Construction Type, # of Stories, Max Occupant Load, Sprinklered Y/N) and confirmed through the Planning/Zoning, Public Works Director, and Building Official sign-off; no separate 'Certificate of Occupancy' document or fee was found published on the City's website.

Verified 2026-07-22 · Source

When you need this permit

  • Change of Use is checked as the 'Proposed Work' scope on the Commercial Building Permit Application -- there is no separate change-of-use or certificate-of-occupancy application form
  • Interior alterations with an occupancy change require plans stamped by a Montana Professional Engineer or Montana registered Architect, per the Commercial Building Permit's Document Submittal Checklist
  • General Information plan sheet must state the occupancy group(s), type of construction, and fire sprinkler/system type for the new use
  • Complete submittals routed to Planning, Zoning, Public Works, and the Building Official for approval, the same as any other Commercial Building Permit scope
  • Occupancy classification, max occupant load, # of stories, construction type, and sprinkler status are recorded in the office-use section and signed off by Planning/Zoning, the Public Works Director, and the Building Official before the permit -- and by extension the new occupancy -- is approved

Required documents

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Fee schedule

Building Permit Fee (Change of Use scope)Same unresolved gap documented on this jurisdiction's Commercial and Residential Building Permit entries -- no valuation-based Building Division fee table is published anywhere on the City of Hamilton website. Chase trail: reviewed the Commercial Building Permit Application (7 pages, directly fetched and OCR'd), Building Department index, Permits & Applications page, and the 2021 Planning & Public Works Fee Schedule -- none contain a Building Division valuation fee table applicable to a change-of-use scope. Left null rather than inventing a figure; contact the Building Department at (406) 363-3316 for a project-specific quote.
Not published — contact the department

Review timeline

Plan reviewTypical estimate — confirm current times with the Hamilton building department
~10–10 business days

How long did your Change of Use / Certificate of Occupancy permit actually take in Hamilton?

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

Inspection process

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

    Tips

    • There is no separate Certificate of Occupancy document or fee published by the City of Hamilton -- occupancy for a new use is confirmed through the Commercial Building Permit's own approval chain (Planning/Zoning, Public Works Director, Building Official sign-off) and the office-use 'Occupancy Type' / 'Sprinklered Y/N' fields on that same form.
    • If the occupancy change involves an interior alteration, budget for a Montana-licensed Architect or Professional Engineer stamp -- occupancy-classification changes are explicitly on the Commercial Building Permit's list of projects that trigger this requirement, unlike a simple like-for-like repair.
    • Since Change of Use is a checkbox on the same Commercial Building Permit Application used for new construction and remodels, expect the full document submittal checklist (architectural/structural/plumbing/mechanical/electrical plans as applicable to the new use) rather than a lighter-weight standalone process.

    Frequently asked questions

    If the project is an interior alteration that includes an occupancy change, yes -- the Commercial Building Permit's Document Submittal Checklist lists 'Interior alteration with an occupancy change' among the project types that require plans stamped by a Montana Professional Engineer or Montana registered Architect.

    Plan review for a change of use / certificate of occupancy permit in Hamilton typically runs 10–10 business days. This is an estimate, not a published figure — confirm current review times with City of Hamilton Building Department at (406) 363-3316.

    You'll need: Commercial Building Permit Application. Depending on your project, Hamilton may also ask for: Architect/Engineer-Stamped Plans. See the required-documents checklist on this page for details on each.

    Apply through City of Hamilton Building Department at 920 New York Ave, Hamilton, MT 59840. Phone: (406) 363-3316, email: dpwsec@cityofhamilton.net. Office hours: City Hall: 223 S. 2nd Street, Hamilton, MT 59840, main line (406) 363-2101. Building Department / Public Works office: 920 New York Ave, (406) 363-3316 or (406) 363-6717. Building Inspector Tim Netzley: (406) 880-5832, inspector@constructmt.com. Inspection scheduling line: (406) 552-3238. Inspections scheduled Monday & Wednesday 1pm-4pm and Fridays 8am-12pm per the Roof Permit Application; 24 hours' notice required for plumbing inspections per the Plumbing Permit Application.. Official information: https://www.cityofhamilton.net/departments/building_department/index.php.

    Hamilton, Montana has adopted: Montana has a mandatory statewide building code administered by the Montana Department of Labor & Industry (DLI) Building Codes Bureau, amended by the Administrative Rules of Montana (ARM) Title 24, Chapter 301. Cities, counties, and towns may become 'certified' to locally administer permitting and inspection for all or part of the code; a certified local program's adopted code 'may include only codes adopted by the Building Codes Bureau' (ARM 24.301.202). Non-certified areas fall under direct state administration by the DLI Building Codes Bureau. Source: Montana DLI Building Codes Bureau, Certified City, County and Town Programs (bsd.dli.mt.gov/_docs/building-codes-permits/certified-city.pdf, updated 04/22/2026).; Hamilton is a Montana DLI-certified jurisdiction for Building (B), Plumbing (P), Mechanical (M), Electrical (E), and Swimming Pool (SP) — full-trade certification — within Hamilton city limits. Certified program contact on file with DLI: Tim Netzley, (406) 880-5832. Source: Montana DLI Building Codes Bureau, 'Certified City, County and Town Programs' roster (bsd.dli.mt.gov/_docs/building-codes-permits/certified-city.pdf, updated 04/22/2026), row 'Hamilton — B, P, M, E, SP — Tim Netzley — 880-5832 — City Limits'. Directly verified by fetching and OCR-extracting the PDF text during this research pass (2026-07-03).; 2021 International Building Code (IBC) — adopted by City of Hamilton per the Building Department's Adopted Codes list on the Residential Building Permit Application; 2021 International Residential Code (IRC) — adopted by City of Hamilton (referenced on the permit application as '2021 International Residential Building Code'); 2021 International Existing Building Code (IEBC) — adopted by City of Hamilton; 2021 International Mechanical Code (IMC) — adopted by City of Hamilton; 2021 International Fuel Gas Code (IFGC) — adopted by City of Hamilton; 2021 International Energy Conservation Code (IECC) — adopted by City of Hamilton; 2021 Uniform Plumbing Code (UPC) — adopted by City of Hamilton (Montana uses the Uniform Plumbing Code, not the International Plumbing Code); 2020 National Electrical Code (NEC) — adopted by City of Hamilton; 2021 International Swimming Pool and Spa Code (ISPSC) — adopted by City of Hamilton; consistent with Hamilton's DLI Swimming Pool (SP) certification; 2017 ICC A117.1 Accessibility — adopted by City of Hamilton; All codes listed verbatim on the City of Hamilton 2023 Residential Building Permit Application, page 2 ('All construction shall comply with the minimum requirements of the following codes'). Source: City of Hamilton Residential Building Permit Application (PDF).. Local amendments apply — see the Hamilton overview page for the full list.

    No. 'Change of Use' is one of the checkboxes under 'Proposed Work' on the City of Hamilton Commercial Building Permit Application itself, alongside New Construction, Addition, Remodel, Re-side, Re-roof, Repair, and Other. No standalone change-of-use application, certificate-of-occupancy document, or dedicated fee was found published separately on the City's website. Source: City of Hamilton Commercial Building Permit Application.

    Sources & verification

    Verified against official sources. Last reviewed 2026-07-22.

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

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