Conn. Gen. Stat. § 8-2o
Enacted by Public Act 21-29 (2021 zoning reform), this section requires zoning regulations adopted under § 8-2 to designate locations or districts where accessory apartments are allowed and to permit at least one accessory apartment as of right on each lot containing a single-family dwelling (and no such apartment may be required to be affordable). It allows the accessory apartment to be attached to, within, or detached from the principal dwelling on the same lot; sets a default maximum net floor area of not less than 30% of the principal dwelling's net floor area or 1,000 square feet, whichever is less; and prohibits requiring more than one parking space or a familial, marital, or employment relationship between occupants of the principal dwelling and the accessory apartment. A municipality may opt out of these provisions through a two-thirds vote of its zoning (or combined planning and zoning) commission following a public hearing under § 8-7d, followed by a two-thirds vote of its legislative body (or board of selectmen), except that no municipality may opt out on or after January 1, 2023.
Pin a building and we'll surface every amendment, effective-date change, and filing deadline as it happens.