Yellowstone County, MT Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Yellowstone County, MT, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Classification
- Treated as accessory building
- Detached placement
- Rear yard, 2-foot setback
- Attached carport
- Meets principal setbacks
- Dedicated rule
- None specific to carports
- Rural unzoned land
- No county rule
Summary
Yellowstone County's zoning ordinance has no separate carport standard; a carport is treated as an accessory building. In the zoning area around Billings that means rear-yard placement with at least a two-foot setback from lot lines and alley. On unzoned rural county land the county sets no rule.
In a residential district a detached garage on an inside lot may be located with the same setback from the street as required for the principal building; providing, that such detached garage does not violate the side yard requirements for a principal building for the district in which it is located.
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
The county's adopted Zoning Ordinance does not single out carports; an open, roofed vehicle shelter is regulated as an accessory building. Under 17.48.060, accessory buildings in a residential district must sit in the rear yard, at least two feet from the rear or side lot line and two feet from the alley, and detached garages/shelters on an inside lot may match the principal building's street setback while keeping the required side-yard width. A carport attached to the house is treated as part of the principal building and must meet the house's front, side and rear yard setbacks for the district. On unzoned rural county land the county imposes no carport setback; only state building code and any covenant apply.
Violations & Fines
A carport placed inside the required setback in the county zoning area is a zoning violation subject to Code Enforcement correction (406-652-2050). No county setback applies on unzoned rural land.
Frequently Asked Questions
Does the county have a specific carport ordinance?
What if my carport is attached to the house?
Sources & Official References
Other rules in Yellowstone County
How Yellowstone County compares: Shed Permit Requirements by City·Compare Yellowstone County to another location·View the Montana accessory structures overview
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