2 adopted codes · 169 cities tracked
Office of the State Building Inspector (OSBI), Department of Administrative Services
International Building Code (IBC)
Commercial and multifamily construction
International Residential Code (IRC)
Single-family and two-family dwellings
International Existing Building Code (IEBC)
Renovations and alterations
International Mechanical Code (IMC)
Mechanical systems
International Plumbing Code (IPC)
Plumbing
International Fuel Gas Code (IFGC)
Fuel gas systems
International Energy Conservation Code (IECC)
Energy efficiency
National Electrical Code (NEC/NFPA 70)
Electrical systems
ICC A117.1
Accessibility
International Fire Code (IFC)
Fire safety
Connecticut is unique in that counties have no governmental authority since 1960. Each of the 169 municipalities (towns/cities) is the fundamental unit of local government and handles its own building permits. The state code is uniform across all municipalities, but permit processes, fees, and local procedures vary. A 2026 CSBC based on 2024 ICC codes is currently being adopted.