Is Helena subject to Montana's Land Use Planning Act?

Yes — Helena falls within the population and county thresholds that trigger the Montana Land Use Planning Act (SB 382), requiring the city to update its growth policy and zoning regulations on a fixed statutory timeline.

Can I build an ADU on a single-family lot in Helena?

Yes — under Montana's 2023 Senate Bill 528, any municipality that exercises zoning power, including Helena, must allow at least one accessory dwelling unit by right on a lot with a single-family home, subject to local design and size standards.

How do I find zoning for a parcel in Helena?

The city's Planning Division maintains the zoning map and ordinance text and can confirm the district and applicable standards for a specific address.

Helena, Montana · city zoning districts · 12 districts

Helena, MT zoning map & districts

Helena, Montana's state capital, zones under its own municipal ordinance, administered by the city's Planning Division, with the Helena Planning Board reviewing rezonings before City Commission action. The city stood up an updated planning process to implement the Montana Land Use Planning Act (SB 382), which requires larger cities in bigger counties to overhaul their growth policy and zoning regulations on a fixed statutory timeline, alongside the separate statewide duplex (SB 323) and ADU (SB 528) mandates that already apply to Helena as a city over 5,000 residents.

The code City of Helena Zoning Ordinance

Helena zoning map

The city's Planning Division maintains the zoning map and ordinance text and handles parcel-level zoning verification and rezoning applications.

There is no link to the official map here yet — confirm current district boundaries directly with the Helena planning or zoning department.

A published summary is never the authority. The adopted ordinance and the city's official zoning map govern, and both change — verify the district and every standard on your parcel before you rely on it.

How zoning works in Helena

Helena's downtown — anchored by the Last Chance Gulch pedestrian corridor — carries its own commercial zoning and design considerations distinct from the city's outlying residential and industrial districts, and much of the city's industrial land sits along its rail corridor and the East Helena/Prickly Pear Creek area.

Helena zoning districts by family

The 12 district codes below are the ones that decide most projects in Helena, grouped by what they are for rather than by the order the ordinance prints them.

Key districts in the City of Helena Zoning Ordinance — a curated reference, not the exhaustive list. Confirm against the current adopted code.
Code	District	What it is for
Residential 5 districts
R-1	Residential District (Large Lot)	Base single-family district; duplexes allowed by right under state law.
R-2	Residential District	Two-family and small multi-family housing.
R-3	Residential District	Multi-family apartments and buildings; includes an R-3-T transitional variant.
R-4	Residential-Office District	GIS confirms R-4 is a residential-office transition district, not the dataset's former 'high-density multi-family' definition.
R-U	Residential Urban District	Higher-intensity urban residential district.
Mixed-use 1 district
R-O	Residential Office District	Office use blended into residential areas; has an R-O-T transitional variant.
Commercial 2 districts
B-1	Neighborhood Business District	Small-scale local commercial.
B-2	General Commercial District	Broader commercial corridor uses, including near Last Chance Gulch; has a B-2-T transitional variant.
Downtown / core 1 district
DT	Downtown District	Helena's downtown core along Last Chance Gulch.
Industrial 2 districts
CLM	Commercial Light Manufacturing District	Blends light industrial with commercial uses; has a CLM-T transitional variant.
MI	Manufacturing & Industrial District	Helena's actual current industrial code; the dataset's former M-1/M-2 codes do not exist on the city's zoning map.
Special purpose 1 district
PLI	Public Lands & Institutions District	Government, schools, and institutional land.

Helena zoning — common questions

Is Helena subject to Montana's Land Use Planning Act?: Yes — Helena falls within the population and county thresholds that trigger the Montana Land Use Planning Act (SB 382), requiring the city to update its growth policy and zoning regulations on a fixed statutory timeline.
Can I build an ADU on a single-family lot in Helena?: Yes — under Montana's 2023 Senate Bill 528, any municipality that exercises zoning power, including Helena, must allow at least one accessory dwelling unit by right on a lot with a single-family home, subject to local design and size standards.
How do I find zoning for a parcel in Helena?: The city's Planning Division maintains the zoning map and ordinance text and can confirm the district and applicable standards for a specific address.

Working in Montana? Get on the list.

The parcel layer lands in the order demand does. Illinois went first because that's where the deals were; the next state is decided by who tells us what they're trying to underwrite. Tell us where you're building and what you wanted to run — you'll hear from us when Montana opens, and sooner if we need a test parcel.

Keep reading

← Montana zoning — who holds the zoning power in Montana, under which enabling statute, and the reforms that override local rules.

Other Montana cities

The zoning reference → — every state, plus city-level district guides like this one.

Helena zoning summaries on this page are provided for information, not legal advice. Confirm every project against the current adopted code for the jurisdiction.