Deer Lodge County, Montana requires building permits throughout the county, and its certified local program enforces residential building codes12. The Planning Department also administers development-district rules, so identify the parcel's district before designing a project3. Septic and well approvals run through Tri-County Environmental Health4.
At a glance
- Building permit
- Required throughout Deer Lodge County; the certified county code program is residential-only521
- Zoning
- Development-district regulations apply; use the county planning map to identify the parcel's district67
- Septic
- A Tri-County Environmental Health permit is required to construct, alter or repair an onsite wastewater system48
- Wells
- A county well permit is required in Anaconda-Deer Lodge County9
- RV living
- Long-term occupancy on private land was not confirmed; ask the Planning Department about the parcel's district10
- Tiny homes
- Occupancy and minimum dwelling size were not confirmed; ask Planning before choosing a design10
- Owner-builder
- No owner-builder exemption from county permits or inspections was confirmed; ask the Building Inspector1
Who to call
Building permits
Anaconda-Deer Lodge County Building Inspector
County building permits and help with the building process; electrical, plumbing and mechanical permits and inspections are outside this office's scope
A-DLC Courthouse, First Floor, 800 Main Street, Anaconda, MT 59711
Zoning
Anaconda-Deer Lodge County Planning Department
Development-district identification and applications for development, building and demolition permits
ADLC Courthouse, First Floor, 800 Main Street, Anaconda, MT 59711
Septic permits
Tri-County Environmental Health
Environmental-health service for Anaconda-Deer Lodge, Granite and Powell counties; county claims identify it as the onsite wastewater permitting authority
A-DLC Courthouse, Third Floor, 800 Main Street, Anaconda, MT 59711
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Deer Lodge County, Montana?
Yes. Deer Lodge County requires building permits throughout the county, and Montana's certified-program list identifies the county's local code program as residential-only12. The county Building Inspector helps the public through the building process, but that office does not issue or inspect electrical, plumbing or mechanical work; those functions belong to the Montana Department of Labor and Industry1. Start with the Building Inspector before construction rather than assuming a rural parcel is exempt1. No county owner-builder exemption was confirmed, so an owner planning to do the work personally should ask the Building Inspector how the permit and inspection requirements apply. The available county material also did not confirm an inspection schedule or a universal certificate-of-occupancy requirement, so ask about required inspection stages and final approval when the permit is issued.
Who issues Deer Lodge County building permits, and how do you reach them?
The Anaconda-Deer Lodge County Building Inspector is the local building-permit contact at 406-563-4011, in the A-DLC Courthouse, First Floor, 800 Main Street, Anaconda, MT 597111. The Planning Department posts the building-permit application along with development and demolition permit applications10. Reach Planning at 406-563-4010 at the same courthouse address10. Because the county's certified building-code program is residential-only, ask the Building Inspector whether a nonresidential project falls to the state Building Codes Program before filing2. For projects under state jurisdiction, Montana requires plans and a Building Permit/Plan Review Application, with separate electrical, plumbing and mechanical permits potentially required11.
Does Deer Lodge County have zoning?
Yes, but the useful question is which development district covers the parcel. Anaconda-Deer Lodge County administers land-use rules through development districts, and the county directs owners to its Planning Map to identify the district and then read that district's regulations in the Development Permit System310. District rules can differ, so do not carry a setback, allowed use or dimensional standard from one part of the county to another7. The available material did not confirm countywide numbers for setbacks, minimum lot size, minimum dwelling size, lot coverage or building height; ask Planning for the rules tied to the parcel's mapped district before laying out a house or accessory structure. In the Medium Density Residential Development District, accessory residential units are special uses requiring a Major Development Permit, but that district-specific rule does not establish treatment elsewhere12.
How do septic permits work in Deer Lodge County?
Tri-County Environmental Health handles onsite wastewater permitting for the Deer Lodge County portion of its multi-county program13. A valid permit is required before constructing, altering or repairing an individual onsite wastewater system, and the application must include property, site-plan, well, drainfield, surface-water, slope, soil and groundwater information8. Human occupancy on property without municipal sewer requires wastewater facilities approved by Tri-County Environmental Health14. Only about 9% of county soils are rated without severe limits for a conventional drain field, so settle system feasibility before committing to a house location15. The department inspects systems installed by non-certified installers, while certified installers may self-inspect and must provide an as-built drawing after completion16. If an approved public sewer is readily available within 200 feet of the property line and connection is approved, wastewater generally must go to that public system unless an exception applies17.
Can you live in an RV or tiny home on your land in Deer Lodge County?
We could not confirm a county rule that answers long-term RV occupancy, temporary camping on private land or tiny-home occupancy across Deer Lodge County. Ask the Planning Department how the parcel's development district treats the proposed unit before buying land or moving an RV onsite10. Do not use Montana's camping limit for Fish, Wildlife & Parks public-use sites as an answer for private land; that rule applies to those public-use sites, not a private parcel18. Any occupied property without municipal sewer must still have wastewater facilities approved by Tri-County Environmental Health, so an RV or compact dwelling does not avoid sanitation review14. A tiny home used as a residence may also involve the county building-permit process, which applies throughout the county1. Minimum dwelling size and manufactured-home occupancy were not confirmed, so take the proposed unit specifications to Planning and the Building Inspector for a parcel-specific answer.
Building a home in Deer Lodge County: the steps, in order
- Use the county Planning Map and confirm the parcel's development district with Planning before fixing the site plan710.
- Ask Planning which development approval is needed, then obtain the county building-permit application and coordinate with the Building Inspector before work starts101.
- Confirm septic and well feasibility with Tri-County Environmental Health; the county requires an onsite wastewater permit for covered work and a well permit for well drilling89.
- If the driveway meets a state highway, obtain the required Montana Department of Transportation approach permit or right-of-way agreement19.
- Ask the local floodplain administrator whether the site lies in a designated Special Flood Hazard Area, because new development there requires a local floodplain permit20.
- Before occupancy, confirm required inspections and final approval with the Building Inspector; the available county material did not publish the inspection sequence.
What should you check before buying land in Deer Lodge County?
Start with buildability, not the asking price. Only about 9% of Deer Lodge County soils are rated without severe limitations for a conventional septic drain field, while about 39.4% of the land has slopes of 15% or less1521. Tri-County Environmental Health may require local review, additional testing and engineering to determine whether septic and well sites are possible, including for parcels over 20 acres22. Confirm the mapped development district and its allowed uses with Planning, then verify legal access; a new or modified approach onto a state highway requires state approval719. Check flood status with the local floodplain administrator before placing a home, fill, road or manufactured home in a designated hazard area20. For carrying costs, the county's effective property-tax rate is about 0.8%, and the median annual property-tax bill is about $1,7062324.
Watch-outs
- Electrical, plumbing and mechanical permits and inspections are handled by the Montana Department of Labor and Industry, not the county Building Inspector1.
- No countywide RV, tiny-home, minimum-dwelling-size or setback answer was confirmed; ask Planning for the rules in the parcel's mapped development district10.
- A county well permit is required in Anaconda-Deer Lodge County, separate from septic approval9.
Sources
- Anaconda-Deer Lodge County Building Inspector (adlc.us)
- Certified City, County and Town Programs, quoted and re-checked
- Planning Department, quoted and re-checked
- Anaconda-Deer Lodge County - Septic Systems / Wells (official site) (2026 county census)
- Anaconda-Deer Lodge County - Planning Department (official site) (2026 county census)
- Planning Department (2026 county census)
- Planning Department, quoted and re-checked
- Tri-County Onsite Wastewater Treatment Regulations, quoted and re-checked
- Septic Systems / Wells, quoted and re-checked
- Anaconda-Deer Lodge County Planning Department (adlc.us)
- Building Permits (Montana statewide rule), quoted and re-checked
- Planning Board Packet November 2020, quoted and re-checked
- Septic Systems / Wells, quoted and re-checked
- Tri-County Onsite Wastewater Treatment Regulations, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Tri-County Onsite Wastewater Treatment Regulations, quoted and re-checked
- Tri-County Onsite Wastewater Treatment Regulations, quoted and re-checked
- Public Use Rules and Regulations (Montana statewide rule), quoted and re-checked
- Approach Manual for Landowners and Developers (Montana statewide rule), quoted and re-checked
- Stream Permitting (Montana statewide rule), quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Sanitation in Subdivisions, quoted and re-checked
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 27, 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.