As of October 1, 2003, the City of Billings will no longer issue building, plumbing, mechanical, and electrical permits that fall outside the City limits. However, there may be county ordinances and regulations that apply.
Certain building, plumbing, mechanical, and electrical permits will be required from the State of Montana, Building Codes Division.
You are encouraged to call if you are planning to develop property beyond the city limits.
Montana Building Codes Division
Yellowstone County Health Dept (RiverStone Health)