Hamilton building permits
VerifiedDepartment contacts, adopted codes, permit types, fees, and gotchas for Hamilton, Montana.
Last verified 2026-07-03 · Source · Embed this page’s badge · Version history
Building department
- Address
- 920 New York Ave, Hamilton, MT 59840
- Phone
- (406) 363-3316
- 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.
- Website
- Official site
Inspection guide
See how inspections work in Hamilton — sequence, scheduling & re-inspection fees.
Codes adopted
Montana adopts a single statewide building code by rule and, by default, enforces it directly — local governments only gain enforcement authority once the state certifies them. Under the Montana Building Codes Act (Mont. Code Ann. Title 50, Chapter 60), the Department of Labor & Industry's Building Codes Bureau adopts one state building code applicable everywhere (§ 50-60-203, codified further at Administrative Rules of Montana Title 24, Chapter 301) — currently the 2021 editions of the IBC, IRC, IMC, IFGC, IECC, IEBC, ISPSC, and UPC, with the 2020 NEC for electrical (effective statewide since 6/11/2022 per the Bureau's own Current Codes page). A city, county, or town may adopt and enforce its own building-code program under § 50-60-301, but its adopted code "may include only codes adopted by the Building Codes Bureau" — a local edition can never diverge from or be less stringent than the state's. Critically, under § 50-60-302, a local government cannot enforce ANY building code — even one it has formally adopted — until the Bureau certifies its program (requiring an approved code, a published fee schedule, an enforcement plan, and properly licensed or nationally certified inspectors); certification is granted per TRADE, not as one blanket designation. The Bureau's own "Certified City, County and Town Programs" list uses the key B=Building, P=Plumbing, E=Electrical, M=Mechanical, SP=Pool, W=Wildland-Urban-Interface — a jurisdiction can be certified for Building only while Electrical/Plumbing/Mechanical remain directly state-enforced within the same city limits (e.g., Havre, Anaconda-Deer Lodge), or certified across all trades (e.g., Billings, Missoula, Great Falls, Bozeman, Helena, Kalispell). Non-certified jurisdictions — most of Montana's unincorporated county land, since very few counties appear on the certified list — fall under direct enforcement by the state Building Codes Bureau (§ 50-60-304). Montana also exempts private homes and buildings of four or fewer dwelling units not serving transient guests from the state building-permit requirement entirely, though electrical, plumbing, and mechanical permits remain separately required regardless. Always confirm with the specific jurisdiction which trades it is certified for versus which remain directly state-enforced.
- 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).
Permit types & fees
Residential Building Permit (New Construction / Addition / Remodel)
Required for new single-family and two-family dwelling construction, additions, remodels, re-siding, and repairs in Hamilton. Reviewed against the 2021 IRC/IBC and related adopted codes by the Planning Department, Public Works, and the Building Official. Applications are submitted to the Building Department at 920 New York Ave.
Electrical Permit
Required for electrical installation, alteration, or repair work in Hamilton, governed by the 2020 National Electrical Code (NEC) as adopted by the City. Hamilton is a Montana DLI-certified jurisdiction for electrical permitting.
Plumbing Permit
Required for plumbing installation, alteration, or repair work in Hamilton, governed by the 2021 Uniform Plumbing Code (UPC) as adopted by the City. Hamilton is a Montana DLI-certified jurisdiction for plumbing permitting. Work must be performed by a licensed Master Plumber.
Mechanical / HVAC Permit
Required for heating, ventilation, air conditioning, and related mechanical installations in Hamilton, governed by the 2021 International Mechanical Code (IMC) and International Fuel Gas Code (IFGC) as adopted by the City. Hamilton is a Montana DLI-certified jurisdiction for mechanical permitting.
Roof Permit
Required for re-roofing work in Hamilton. A flat-fee permit with a fixed $50 charge, reviewed by the Building Official.
Accessory Dwelling Unit (ADU) / Detached Accessory Structure Permit
ADUs and detached accessory structures (garages, backyard cottages) are permitted by right on lots with a single-family home in Hamilton's RS, RM, RH, and B zoning districts, subject to Hamilton Municipal Code Section 17.16.060, and require their own residential building permit separate from the principal dwelling's permit.
Fence Permit
Fences in Hamilton are reviewed by the Planning Department under a fixed-fee zoning permit process, separate from the Building Department's construction-trade permits.
Structure Move Permit
Required for moving an existing building or structure within or into Hamilton city limits.
Swimming Pool / Spa Permit
Required for installation of swimming pools and spas in Hamilton, governed by the adopted 2021 International Swimming Pool and Spa Code (ISPSC). Hamilton is a Montana DLI-certified jurisdiction for Swimming Pool (SP) permitting — one of only a subset of Montana municipalities with this certification. No dedicated standalone pool-permit application form or pool-specific fee line was found published separately from the general Building Permit process; pools are permitted through the standard Residential/Commercial Building Permit application referencing the adopted ISPSC.
Solar Photovoltaic (PV) Permit
Required for installation of rooftop or ground-mount solar photovoltaic systems within Hamilton city limits. Requires a Building Permit (structural/racking, required when roof modification is involved) plus an Electrical Permit -- Hamilton is a Montana DLI-certified jurisdiction for both Building and Electrical permitting, so both are issued locally by the City rather than the State. The City's own Electrical Permit Application carries a dedicated flat fee line for renewable energy systems.
EV Charger / EVSE Permit
Hamilton has no dedicated EV charger or EVSE permit and no distinct fee line item for electric vehicle charging equipment on the City's Electrical Permit Application. EV charger circuit work is billed as a standard electrical installation under the same City of Hamilton Electrical Permit used for all wiring work -- typically the flat 'one additional circuit or piece of equipment' fee (the same category used for a hot tub or air conditioner circuit) for a single charger added to an existing single-family home, or the general valuation-based tiers for larger/commercial installations. Hamilton is a Montana DLI-certified jurisdiction, so permits are issued locally by the City Building Department, not the state.
Sign Permit
Required for installation of wall, projecting, canopy/awning, under-canopy, and freestanding signs within Hamilton. Applications are reviewed by the Planning Department for conformance with the Sign Regulations at Hamilton Municipal Code (HMC) Chapter 17.28. Signs meeting certain height, size, or placement thresholds also trigger an additional Building Code Review with a final inspection by the City Building Inspector, and any sign with a new electrical component requires a separate Electrical Permit.
Fire Sprinkler / Fire Alarm Permit
Hamilton has no standalone fire sprinkler or fire alarm construction permit or fee. Fire suppression (sprinkler) and fire alarm system plans are submitted and reviewed as part of the City of Hamilton Commercial Building Permit -- the Document Submittal Checklist for Commercial Projects lists 'Fire sprinkler/Fire alarm layouts and specs (if applicable)' as a required plan-set item, the Mechanical Plan checklist requires applicants to 'Indicate type of fire suppression equipment,' and the Commercial Building Permit form itself carries an office-use field, 'Sprinklered: Y/N Required: Y/N.' Statewide, the Montana Fire Code (2021 IFC, adopted via ARM 23.12.601) is enforced by the Montana State Fire Marshal (DLI), and fire suppression/alarm contractors must hold a Montana DLI Fire Protection License -- but Hamilton is not listed on the DLI's certified-jurisdiction roster for a separate Fire trade (only Building, Plumbing, Mechanical, Electrical, and Swimming Pool), consistent with fire sprinkler/alarm plan review being folded into the Building Official's Commercial Building Permit review rather than issued as its own city permit.
Change of Use / Certificate of Occupancy
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.
New residential construction activity
New privately-owned residential construction onlyHousing units authorized by building permits for new privately-owned residential construction — this is not total permit volume (no commercial permits or remodels).
- Latest month (2026-05)
- No data reported
- Trailing 12 months
- 8units
7 of 12 months reported · #15 in Montana coverage by units
- Year to date (2026 YTD through 2026-05)
- 12units
8 buildings · $2.6M valuation
4 month(s) reported to Census
- Full year 2025
- 46units
36 buildings · $10.9M valuation
Source: U.S. Census Bureau, Building Permits Survey (BPS), 2026-05 vintage. Census survey data — separate from the permit-requirements verification above. All Montana building activity
Tips & gotchas
- Montana runs a mandatory statewide building code (ARM Title 24, Chapter 301) administered by the DLI Building Codes Bureau. Hamilton is FULLY certified for Building, Plumbing, Mechanical, Electrical, and Swimming Pool (B, P, M, E, SP) — confirmed directly from the DLI's 'Certified City, County and Town Programs' roster (bsd.dli.mt.gov/_docs/building-codes-permits/certified-city.pdf, updated 2026-04-22), which lists 'Hamilton — B, P, M, E, SP — Tim Netzley — 880-5832 — City Limits'. This means Hamilton issues and inspects ALL trade permits itself within city limits; nothing routes to the state DLI Building Codes Bureau for in-city work.
- Building Inspector Tim Netzley (880-5832) also appears on the DLI roster as the certified official for neighboring Darby and Stevensville (also Ravalli County) — these are three separately DLI-certified programs sharing the same building official, not a merged jurisdiction. Do not conflate Hamilton's permitting scope with Darby's or Stevensville's.
- Codes adopted (per the Residential Building Permit Application's printed code list): 2021 IBC, 2021 IRC, 2021 IEBC, 2021 IMC, 2021 IFGC, 2021 IECC, 2021 UPC, 2020 NEC, 2021 ISPSC, and 2017 ICC A117.1 Accessibility.
- Residential Building Permit review: complete submittals routed to Planning, Zoning, Public Works, and the Building Official 'could take up to 10 days'; the clock restarts from resubmittal if more information is requested. The Roof Permit Application separately states a flat '10 working days' review. No permit-type-specific timeline beyond these two was found published for Electrical, Plumbing, Mechanical, or Pool permits — the 10-day figure is applied as the governing departmental review figure for those types but flagged unverified at the permit-type level.
- No valuation-based Building Permit fee table was found published anywhere on the City of Hamilton website — the 2021 Planning & Public Works Fee Schedule covers only Planning/Zoning/Public Works fee items (floodplain, annexation, zoning, subdivision, encroachment, site-plan-review, business licensing), not Building Division construction-valuation fees. This is a genuine gap in the City's public online documentation, not an inference — chased across the Building Department index, Permits & Applications page, the Residential Building Permit Application (5 pages), and the fee schedule PDF itself.
- Electrical and Mechanical permit fees ARE fully published with valuation tiers and flat per-item rates, printed directly on their respective permit application PDFs.
- Plumbing permit fees are itemized by fixture/service type on a 'Schedule of Plumbing Fixtures' table, but the printed dollar rate column did not extract as text (likely a fillable-field or scanned rate column) — only the $75 inspection fee, $45 re-inspection fee, and the double-fee penalty citation (Section 50-6-509, MCA) are confirmed as plain printed text.
- Beginning construction without a permit results in doubled fees: HMC 15.08.080 (building/general) and Section 50-6-509, MCA (plumbing, cited directly on the Plumbing Permit Application).
- ADUs are allowed by right in RS, RM, RH, and B zoning districts per Hamilton Municipal Code 17.16.060: max 1,000 sq ft or 75% of the principal dwelling (whichever is less), one per lot, 10-foot rear setback for new detached units (conversions exempt), no front-yard placement, unique Ravalli County GIS address required, no additional parking required, and no impact fees charged.
- No standalone Demolition Permit application/fee schedule was found published separately — demolition work in Hamilton appears to route through the general Building Permit process referencing adopted codes (IBC/IEBC), similar to how Swimming Pool work routes through the general Building Permit rather than a dedicated pool-permit form. This is a documented information gap, not an inferred fact.
- Inspections (per the Roof Permit Application's printed inspection-window notice) are scheduled Monday & Wednesday 1pm-4pm and Fridays 8am-noon; 24 hours' notice is separately required for plumbing inspections specifically.
- Fence Permit Review costs a flat $25 per the City's own Planning & Public Works Fee Schedule (Zoning Review section) — this is a Planning Department review, distinct from Building Division trade permits.