Here's a question I get from almost every out-of-state buyer looking at Bozeman as a rental play: didn't Montana just make it legal to build an ADU and rent out both units without living there?
The answer is yes, and also no, and the gap between those two answers is exactly where a lot of purchase contracts are about to get complicated.
Montana's 2023 legislature passed Senate Bill 245, which stripped cities of the power to block accessory dwelling units through zoning and, just as importantly, eliminated the owner-occupancy requirement that used to govern them. You no longer have to live in the primary home or the ADU to own either one. You can rent both units to separate tenants with no family relationship required. That part of the story is true, current, and exactly what investor-focused blogs have been telling people all year.
What those same blogs tend to skip is that owning an ADU and renting it out overnight are governed by two completely different sets of rules in Bozeman, and the second set didn't loosen at all. If anything, the city just tightened it. On February 1, 2026, Bozeman's entirely rewritten zoning code took effect, and it quietly closed the short-term rental door in most of the residential lots where that new ADU freedom was supposed to pay off.
Two Different Governments, Two Different Questions
State law and city ordinance are answering different questions, and mixing them up is where the investment math goes wrong.
SB 245 answers the question of whether you can own and build an ADU without living on the property. The answer is yes, statewide, and no local government can override it through zoning.
Bozeman's short-term rental ordinance answers a completely separate question: whether the city will issue you a permit to rent that unit by the night. That power stayed with the city. The state sets the tax rules and the landlord-tenant law. Bozeman decides whether your nightly-rental business model is legal at all, and that's a decision the city has been actively narrowing since 2023.
What Bozeman's Permit Types Actually Allow
The city's short-term rental system sorts every listing into one of four categories, and the differences matter more than most buyers realize before they're under contract.
| Permit Type | Who has to live there | What you can actually rent |
|---|---|---|
| Type 1 | Host's primary residence, host present during the stay | A room or rooms in the house you're living in |
| Type 2A | Host's primary residence, host absent during the stay | The whole house while you're traveling |
| Type 2B | Host's primary residence on the same lot or building | An ADU or one additional unit, not the main house |
| Legacy Type 3 | Not owner-occupied, frozen since December 14, 2023 | The whole property, but only for permits that already existed |
Look at that table and notice what's missing. There is no permit type that lets someone buy a Bozeman property, never live there, and rent out an ADU or the main house on a nightly basis as a hands-off investment. Even Type 2B, the category built specifically for ADU rentals, requires your actual primary residence to sit on that same lot. The state removed the owner-occupancy requirement for owning an ADU. The city never removed it for renting one out overnight.
The Legacy Trap Hiding in "Turnkey Airbnb" Listings
This is the detail that catches buyers mid-transaction, not before they make an offer.
A Legacy Type 3 permit, the whole-home, no-owner-occupancy category, only exists for listings that already had an active city permit before December 14, 2023. New ones haven't been issued in almost three years. If you're looking at a property marketed as a proven, income-generating short-term rental and the listing agent points to last year's booking revenue as evidence, ask directly whether that permit is Legacy Type 3, because the city's own rules state that if a Legacy Type 3 permit is forfeited by a transfer of ownership, the property loses eligibility to operate as one. The income history transfers to the new owner's spreadsheet. The permit does not.
That means the exact properties most likely to be marketed to investors as "already cash-flowing" are the ones where the cash flow is contractually guaranteed to disappear at closing, unless the buyer restructures the use entirely around occupancy, which is a different business than the one being sold.
Then the City Rewrote the Map
On December 16, 2025, the Bozeman City Commission adopted Ordinance 2151, a complete replacement of Chapter 38 of the municipal code and the zoning map underneath it, effective February 1, 2026. Among the changes, the old RS, R1, and R2 districts, which together covered the bulk of Bozeman's traditional single-family neighborhoods, were folded into a single new district called RA.
The city's own guidance on this is specific: only Type 1 short-term rentals are allowed in RA, and Type 2 permits operating in that zone may no longer be valid under the new code. Read that against the permit table above. Type 2B, the one path that let an owner rent out an ADU by the night, is a Type 2 permit. In the newly consolidated RA district, that path appears to be gone.
You can still build the ADU. SB 245 guarantees that. You can still rent it long-term to a tenant on a lease. What you likely can't do, if your target property now sits in RA, is list that ADU on a booking platform for nightly stays, no matter how the state ADU law reads on its own.
What This Means for the Investment Math
As of Q2 2026, Bozeman's MLS-reported residential median sale price sat at $702,500, essentially flat from the first quarter of the year. That's not a distressed number, and it's not the number that should scare off a buyer who wants an ADU for a parent, a long-term tenant, or future flexibility. It's the number that should make an investor pause if the entire purchase thesis was built on nightly-rental income from a unit that current zoning may not let them rent nightly at all.
An ADU still adds real value to a Bozeman property. It adds housing flexibility, it can carry a long-term rental at a defensible market rent, and it can make a purchase easier to justify to a lender or a family. What it very likely does not do anymore, in most of the city's core residential zones, is function as an unsupervised short-term rental machine for an owner who lives somewhere else.
Before You Write the Offer
Check the zoning district before you check the comps. The city's Community Development Viewer will tell you whether a specific parcel now falls in RA or in one of the zones where Type 2 permits still apply, and that answer changes the entire return profile of adding an ADU.
If a listing advertises existing short-term rental income, get the permit type in writing, not just the booking history. A Legacy Type 3 designation is not an asset that survives closing.
And loop in a buyer's agent before you're several weeks into due diligence with a contingency clock running. Part of what a CEBA-designated buyer's agent does is separate what a listing implies from what the zoning and permitting record actually allows, before that gap becomes your problem instead of the seller's.
A Few Questions Worth Answering First
Can I still build an ADU in Bozeman purely as an investment? Yes. State law protects your right to own it without living there and to rent it long-term. What's changed is the nightly-rental path, not the ADU itself.
If I buy a house with an existing Airbnb permit, do I inherit that income? Not automatically. Legacy Type 3 permits are voided by any change in ownership, so the booking history on the listing sheet doesn't carry forward with the deed.
Does the new RA zone cover the whole city? No. RA replaced the former RS, R1, and R2 districts specifically. Other zoning categories may still allow Type 2 permits, which is exactly why checking the parcel's current district before making assumptions matters more now than it did a year ago.
Bozeman's regulatory picture on ADUs and short-term rentals changed twice in the last three years, and it's easy to read half the story and miss the half that actually governs your return. If you're weighing an ADU purchase for income, for family, or for future flexibility, Tyler Garrison can walk the current zoning map and permit rules with you before you're locked into a contract that assumed the wrong set of laws applied. Schedule a free consultation and get the full picture before you write the offer, not after.
