If a house has a certificate of occupancy for a single family residence it can not be legally divided. Some homes do have certificates of occupancy that allow for two or three families to legally reside there. Town records must be researched to determine the legal status.
Some homes can legally have an accessory apartment. The house must be owner-occupied and meet other requirements, including the proper applications and approvals from Code Enforcement .
Boarding houses are also permitted for up to two boarders. The boarders must share common areas and kitchen with the main occupants. Bed and breakfasts must have the proper permits. The Building Department reviews application for the conversion. An annual permit is then administered through Public Safety.