Toole County, Montana has no local building-code enforcement program for residential construction, so it doesn't issue its own building permit for a typical home1. A private home with four or fewer units that doesn't serve transient guests is also exempt from Montana's state building permit2. Septic systems go through the Toole County Environmental Health Department, and development in a designated flood hazard area of unincorporated Toole County requires a floodplain permit34.
At a glance
- Building permit
- No local residential permit program; a typical home under five units that isn't a rental for transient guests is exempt from the state permit too12
- Zoning
- No countywide zoning is referenced on official county pages, but this isn't stated outright either way5
- Septic permits
- Toole County Environmental Health Department3
- Road access permit
- Free if obtained before work starts; a $250 fee applies if you build an approach onto a county road before getting the permit6
- Septic soils
- Only 11.2% of county soils are free of severe limits for a conventional drain field7
- Tiny homes
- A factory-built tiny house under 400 sq ft on a permanent foundation, used as a single-family dwelling, falls under the state's Appendix Q BB rule8
- Subdivision lot size
- No fixed countywide number; where zoning sets none, consult local and state health authorities9
Who to call
Septic permits
Toole County Environmental Health Department
Septic-system administration, plan reviews and inspections, and other environmental-health matters for Toole County
229 2nd Ave South, Shelby, MT 59474 (mailing: P.O. Box 241, Cascade, MT 59421)
Roads & driveways
Road Access Permits for new approaches onto Toole County roads; proof of insurance must be on file in this office before an application is valid
226 1st St S, Shelby, MT 59474
Building permits
Montana Building Codes Program (Building & Commercial Measurements Bureau)
State building permits for non-exempt construction in areas without a certified local residential building-code program, including unincorporated Toole County
2705 Skyway Drive, Helena, MT
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Toole County, Montana?
Toole County has no local building-code enforcement program for residential construction, so there's no county-issued building permit to get for a typical home1. Montana's own state exemption list backs this up for most rural buyers: farm and ranch buildings, private storage buildings and garages, and private homes or apartments with four or fewer units that don't serve transient guests are all exempt from the state building permit2. That last condition matters if you're planning a short-term rental: a small home that serves transient guests loses the exemption and falls back under the state permit process2. Toole County is locally certified for commercial building-code enforcement, so a commercial project here may go through the county rather than the state; a residential project outside that carve-out follows the statewide framework instead10.
Who handles permits and inspections in Toole County?
For septic and other environmental-health matters, contact the Toole County Environmental Health Department, with an office at 229 2nd Ave South in Shelby11. For a new approach or driveway crossing a Toole County road, the Road Access Permit comes from the Toole County Commissioners at the courthouse in Shelby, and you'll need proof of insurance on file there before the application is valid12. For the rare non-exempt residential project, or a home that will serve transient guests, Montana's Building Codes Program in Helena handles the state permit13.
Does Toole County have zoning?
We could not confirm whether Toole County currently has a countywide zoning ordinance, so ask the Commissioners before relying on a parcel being unzoned5. Montana law allows a county commission with an adopted growth policy to adopt zoning, which means the answer can change14. Toole County's subdivision regulations do answer the lot-size question for new subdivisions: where zoning does not set minimum lot sizes, the minimum is established in consultation with local and state health authorities rather than by one fixed countywide number9. We could not confirm countywide setback, lot-coverage, building-height or minimum dwelling-size standards; ask the Commissioners and Environmental Health Department about the specific parcel and proposal.
How do septic permits work in Toole County?
Septic systems in Toole County are administered by the county's Environmental Health Department, which lists septic systems among its responsibilities1115. Statewide, Montana's drainfield-permit rule reaches even a property that already has a Certificate of Subdivision Approval: a COSA does not replace the separate drainfield permit required from the local health department1617. Soils are a real constraint here: only 11.2% of Toole County's soils are free of severe limits for a conventional drain field, so get a site evaluation from the Environmental Health Department before you count on a standard system7. If you're not on a public water supply, you'll also need to sort out your well: Montana requires a water-use permit for new or expanded groundwater use, though an exempt well can skip it if your combined appropriation stays at or under 10 acre-feet a year, and starting January 1, 2026 you must file a $400 Notice of Intent with DNRC before using that exempt well18.
Can you live in an RV or tiny home on your land in Toole County?
We could not confirm a Toole County rule allowing long-term RV occupancy on private land, so ask the Commissioners and Environmental Health Department before treating an RV as a residence. Montana's separate state-trust-land rules allow dispersed camping with a Conservation License; hunting- or fishing-related camping needs no additional permit, while group camping needs a special recreational-use license19. State trust land limits stays to 2 days on leased or licensed land and 16 days within a 30-day period on unleased or unlicensed land and in designated campgrounds; those limits do not decide what is allowed on private land19. A factory-built tiny house of 400 square feet or less, excluding lofts, must be on a permanent foundation and used as a single-family dwelling to fall under Montana's Appendix Q BB rule8.
Building a home in Toole County: the steps, in order
- Confirm whether the home qualifies for Montana's building-permit exemption; private homes with four or fewer units that do not serve transient guests are exempt2.
- If the project is not exempt, apply to Montana's Building Codes Program before construction13.
- Have the Toole County Environmental Health Department evaluate the site and issue the required drainfield permit1116.
- Ask the local floodplain administrator whether the site lies in a designated Special Flood Hazard Area; development there in unincorporated Toole County requires a floodplain permit4.
- Apply to the Commissioners before building an approach onto a county road; starting first triggers a $250 fee126.
- If the parcel needs a well, determine the applicable water-right path and file the required DNRC notice before using an exempt well18.
What to check before you buy land in Toole County
Toole County gets 12.8 inches of precipitation a year, spends 15.4% of years in severe drought and is 0.9% wooded, so verify a dependable water source and plan for exposure202122. Only 11.2% of county soils are free of severe limits for a conventional drain field, making a septic evaluation important before purchase7. Ask whether the parcel is in a designated flood hazard area because fill, excavation, roads, culverts, manufactured homes and building work there can require an unincorporated-county floodplain permit4. A state-highway driveway needs an MDT approach permit or right-of-way agreement, while a county-road approach goes through the Commissioners236. Property taxes have an effective rate of 1%, with a median annual bill of $1,8052425.
Watch-outs
- Whether Toole County has any zoning ordinance isn't stated outright on an official county page one way or the other; the census finding of 'no zoning' rests on its absence from the pages this research could open, not an explicit county statement5.
- Development in a designated flood hazard area of unincorporated Toole County requires a floodplain permit, but we could not confirm the administrator's office; ask the Commissioners or Environmental Health Department for the current contact4.
- A small home that serves transient guests loses Montana's residential building-permit exemption; confirm with the state Building Codes Program before treating a planned short-term rental as exempt2.
Sources
- Toole County - Environmental Health and Sanitarian (2026 county census)
- Frequently Asked Questions, quoted and re-checked
- Environmental health and/sanitarian - Toole County (2026 county census)
- Stream Permitting, quoted and re-checked
- Toole County - Environmental Health and Sanitarian (2026 county census)
- Permission to Access Toole County Roads, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- 2024 Building Code Amendments, quoted and re-checked
- Toole County Subdivision Regulations, quoted and re-checked
- Is a State Building Permit Needed?, quoted and re-checked
- Toole County Environmental Health Department (toolecountymt.gov)
- Toole County Commissioners (toolecountymt.gov)
- Montana Building Codes Program (Building & Commercial Measurements Bureau) (bsd.dli.mt.gov)
- 76-2-201. County zoning authorized, MCA (Montana statewide rule), quoted and re-checked
- Environmental health and/sanitarian - Toole County, quoted and re-checked
- Engineering Infrastructure & Subdivisions, quoted and re-checked
- Engineering Infrastructure & Subdivisions (Montana statewide rule), quoted and re-checked
- Apply for Water Rights, quoted and re-checked
- Camping - Montana DNRC, quoted and re-checked
- Annual precipitation: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Wooded share of land: Bolthole Index county data
- Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.