The following are building codes that have been adopted by the City of Billings:

• International Building Code, 2018 Edition
• International Energy Conservation Code, 2018 Edition
• International Existing Building Code, 2018 Edition
• International Fuel Gas Code, 2018 Edition
• International Mechanical Code, 2018 Edition
• International Residential Code, 2018 Edition
• National Electrical Code, 2017 Edition
• NFPA 99c, Standard on Gas and Vacuum Systems (med gas), 2018 Edition
• Uniform Plumbing Code, 2018 Edition
• International Swimming Pool & Spa Code, 2018 Edition