Connecticut Zoning & Land Use Guide

Key Facts

• Building Code: 2018 CT State Building Code (based on IBC)
• State ADU Law: Yes — ADU-friendly
• ADU Details: Connecticut CGS Sec. 8-2o created a statewide default for accessory apartments, but municipalities could opt out through the statutory process. Where the state default applies, local regulations must allow a maximum net floor area of at least 30 percent of the principal dwelling or 1,000 square feet, whichever is less, unless local rules are more permissive.