State Guide · Verified 2026
Shed Installation Permits in Montana
The Building Code in Montana
Montana statewide code (2021 I-Codes), Building Codes Program, with a residential exemption from state permits
The Montana Building Codes Program, within the Dept. of Labor and Industry, adopts a uniform statewide code based on the 2021 International Codes and enforces it directly in any city, county, or town that has not established its own certified local program. Montana state law separately exempts residential buildings under five dwelling units, along with private garages and storage buildings, from the state building permit requirement specifically. Since virtually every shed sits on this kind of exempt residential property, the state's own Building Codes Program generally doesn't reach the shed question at all. Cities with their own certified programs, including Billings, Missoula, and Bozeman, instead enforce a local exemption of roughly 200 square feet, with a zoning or land use permit still required either way.
Quick Facts
Who Sets the Rules
A state code that mostly doesn't reach the shed question
Montana's exemption of private garages and storage buildings from the state building permit requirement is genuinely unusual. Since a residential shed sits on exactly this kind of exempt property, the state Building Codes Program isn't the practical authority most homeowners deal with, the real question shifts to whichever city has, or hasn't, set up its own certified program.
Billings, Missoula, and Bozeman fill the gap locally
These cities run their own certified building code programs and each apply a roughly 200 square foot local exemption for sheds, closing the gap the state exemption leaves open, though a zoning or land use permit is still required regardless of the building permit status.
A zoning permit rarely goes away
Even where no building permit is required, whether from the state exemption or a local one, Montana homeowners almost always still need a zoning or land use permit confirming setbacks and lot coverage before placing a shed.
Snow load varies by elevation, not a single number
Montana has no single statewide ground snow load value. Roof design loads depend on local elevation and climate data, often sourced from the local building authority or the state's own published snow load resources, a real structural factor for any shed that does require a permit.
Rural areas can mean genuinely no oversight
Outside cities with their own certified programs, and beyond the reach of the state's own limited enforcement, some rural Montana areas have essentially no building oversight for a residential shed at all.
What people get wrong
The most common mistake is assuming Montana's statewide code means fences and sheds are covered by it the way they are in most other states. The state exemption for private garages and storage buildings means the real answer almost always comes from the local jurisdiction, not the state code itself.
Counties With Their Own Rules
These Montana counties have verified, county-specific shed installation rules that differ from the state baseline:
Check Your County
Select your county for the local rule, fees, and your building department's contact details:
Building It Yourself? Here's What You'll Need
Popular tools and materials homeowners use for a shed installation project:
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Official Sources
Rules change and cities within a county may differ. This guide is general information, not legal advice — always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.