Helena building permits
Department contacts, adopted codes, permit types, fees, and gotchas for Helena, Montana.
Last verified 2026-07-02 · Source
Building department
- Address
- 316 N. Park Avenue, Room 435, Helena, MT 59623
- Phone
- (406) 447-8438
- Office hours
- City County Building, 316 N Park Ave, Helena, MT 59623; applications and permits also processed online via Civic Access (helenamt.gov/business/civic-access/)
- Website
- Official site
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.
Permit types & fees
Residential Building Permit (One- and Two-Family Dwelling — New Construction)
Required for construction of new single-family and two-family (duplex) dwellings within Helena city limits. Reviewed against the 2021 International Residential Code (IRC) as adopted statewide by Montana and enforced locally by the City of Helena Building Division, a DLI-certified building code enforcement program.
Residential Addition / Remodel / Alteration Permit
Required for additions, remodels, and structural alterations to existing one- and two-family dwellings within Helena city limits, using the same valuation-based fee schedule and 2021 IRC review standards as new construction.
Electrical Permit
Required for any electrical installation in new construction, remodeling, or repair within Helena city limits, except as provided by MCA 50-60-602. The City of Helena is DLI-certified to enforce electrical code within city limits under the 2020 NEC as adopted statewide by Montana.
Plumbing Permit
Required for installation, removal, alteration, or repair of plumbing, water and sewer service lines, gas lines, and drainage systems within Helena city limits. The City of Helena is DLI-certified to enforce plumbing code within city limits under the 2021 Uniform Plumbing Code (UPC) as adopted statewide by Montana.
Mechanical / HVAC Permit
Required for any installation or alteration to heating, ventilation, air-conditioning, hood systems, boilers, wood stoves, or other miscellaneous heat-producing appliances within Helena city limits. The City of Helena is DLI-certified to enforce mechanical code within city limits under the 2021 International Mechanical Code (IMC) as adopted statewide by Montana.
Roofing Permit (Reroof)
Required for installation of new roofing materials and replacement of roofing materials (re-roof) on one- and two-family dwellings within Helena city limits. The City of Helena Building Division is the Authority Having Jurisdiction under 2021 IRC Chapters 8 and 9; structures of three dwelling units or more and all commercial structures are instead regulated under the 2021 IBC Chapter 15.
Accessory Dwelling Unit (ADU) Permit
Required for construction of an Accessory Dwelling Unit on a residential parcel within Helena city limits. Helena City Code Title 11 (Zoning) formally defines and permits ADUs by right in nearly all residential and mixed-use zoning districts; construction itself follows the standard City of Helena residential building permit process under the 2021 IRC/IBC.
Deck Permit
Required for decks attached to or associated with one- and two-family dwellings within Helena city limits that do not qualify for the City's deck permit exemption. Governed by the City of Helena Deck Policy (October 2022) under the 2021 IRC.
Fence Permit
Required only for fences exceeding 7 feet in height within Helena city limits; fences 7 feet or less do not require a building permit.
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)
- 8units
8 buildings · $2.7M valuation
- Trailing 12 months
- 491units
12 of 12 months reported · #4 in Montana coverage by units
- Year to date (2026 YTD through 2026-05)
- 358units
53 buildings · $78.8M valuation
5 month(s) reported to Census
- Full year 2025
- 193units
96 buildings · $45.1M 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
- Helena is a DLI-certified local government building code jurisdiction (certified for Building, Plumbing, Electrical, and Mechanical only — not Swimming Pool or WUI), and its certification applies ONLY within Helena's incorporated city limits (MCA 50-60-304). If your project is in unincorporated Lewis and Clark County outside Helena's (or East Helena's) city limits, your permit authority is the Montana DLI Building Codes Program directly, not a county building department — Lewis and Clark County itself has no separate certified building-code enforcement program.
- Helena's building permit and plan review fees are both driven off Ordinance 3134's valuation table, using the GREATER of your stated contract cost or the City's ICC-based square-foot valuation — plan review is billed at 65% of the building permit fee on top of that.
- The City's fee/application PDFs for plumbing, mechanical, and electrical permits are scanned image documents (not searchable text) — always open and read them directly since prior citation checks on other jurisdictions found errors from skimming similar scanned fee tables.
- Homeowners get a plumbing permit exemption for interior work on their own owner-occupied, non-rental home, but no equivalent blanket exemption exists for electrical work (Montana licensure required except under MCA 50-60-602) or for general building permits.
- Decks, fences (7 ft or under), and several other minor structures are exempt from a City of Helena building permit — but zoning setback and lot-coverage rules under City Code Title 11 still apply even when no permit is required.