Straight answers
What states allow off-grid living?
No state bans off-grid living outright, and none permits it outright either, because it is not decided at state level. Three rules bind at once and all three are local: zoning decides whether a dwelling is allowed on the parcel at all, the building code decides which water and waste systems are permitted in it, and the health authority decides whether an on-site sewage system can be approved. The same state can be permissive on all three in one county and restrictive in the next.
Figures verified against the sources below · September 4, 2026
01 — The longer answer
Why the best-states rankings are unreliable
This is why the ranked “best states for off-grid living” lists are unreliable. They are assembled from state-level generalities, while the decision that actually stops a project is made by a county building department or a health authority. A state with no statewide residential code is not automatically the permissive option either: it means the answer moves down to the county, which may be stricter rather than looser.
Two things genuinely are set at state level and do change the answer. The first is which building code the state adopts, if any. Wyoming does not adopt the IRC for residential construction at all, so its residential rules are a local choice; the statewide codes cover public, business and industrial buildings. Montana, by contrast, adopted the 2021 IRC with Appendix Q statewide under ARM 24.301.154, which gives a small dwelling on a foundation a defined permitting path.
The second is how your home is classified, and for off-grid buyers this matters more than anything else here. Montana titles a tiny house on wheels as a travel trailer through the Motor Vehicle Division, which makes it a vehicle rather than real property. A home the jurisdiction treats as a vehicle is frequently prohibited as a permanent dwelling regardless of how it is powered, while the same parcel will permit a modular home on a foundation. Battery capacity is not what decides that.
So check the three rules against your parcel rather than your state. Our state guides publish the building code in force and the sources we checked it against, and say so where something is unresolved instead of guessing.
03 — Sources
Each figure above links to the authority it came from.
Montana adopted the 2021 IRC with Appendix Q statewide under ARM 24.301.154, applied to factory-built tiny houses on a permanent foundation used as single-family dwellings
law.cornell.eduMontana building codes in force, administered by the DLI Building Codes Program
bsd.dli.mt.govWyoming State Fire Marshal statewide adopted codes: the IRC is not adopted for residential construction, and state code enforcement covers public, business and industrial buildings
wsfm.wyo.gov
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