Can You Build an ADU in Bozeman?
Yes — Bozeman is governed by Montana's statewide ADU law, which limits what the city can restrict. A 700 sq ft detached ADU here runs about $151,000–$247,000.
Construction costs in Bozeman track close to the Montana state average.
Detached ADU (700 sq ft)
$151,000–$247,000
Garage conversion (400 sq ft)
$47,000–$86,000
Statewide protection
Yes
What applies in Bozeman
Montana's statewide standard (Montana SB 528 (2023)) is the starting point, but parcel-level rules, fees and design review are set locally. Confirm those details with Bozeman before design.
Estimate your Bozeman ADU cost
Your property
ADU typeEstimated cost in Montana
$151,000 – $247,000
≈ $216–$353/sq ft turnkey · midpoint $199,000
- $135,300
- Construction
- $35,800
- Design & permits
- $27,900
- Site work
- iSize set locally. This state leaves ADU size limits to your city — typical caps run 600–1,200 sq ft. Check your local code.
- ✓No extra parking likely required. Set by local ordinance — commonly 1 space per ADU unless near transit.
- iOwner-occupancy varies. Owner-occupancy rules are set locally in this state.
- ✓Lot has room. A 700 sq ft ADU uses about 12% of your 6,000 sq ft lot — comfortably within typical coverage limits.
Rule basis: Montana SB 528 (2023)
If you rent it out
$1,050–$1,700
est. rent/mo
8.3%
gross yield
13 yrs
payback
~$15,345/yr after a 7% vacancy allowance, before financing & maintenance.
Financed over 20 yrs at 7.5%, the build is about $1,603/mo — vs ~$1,375/mo in estimated rent.
Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.
Get matched with a vetted ADU builder in Bozeman
Tell us about your project and we'll introduce you to a builder who works in your area. Free, no obligation.
Other Montana cities
Estimates are for planning only and are based on regional construction-cost indices and published statewide ADU statutes. Local ordinances, lot conditions and contractor pricing vary — always confirm with your city planning department and a licensed contractor.