Every lot must provide front, rear and side yards as required for its respective district. All front yards must face a dedicated public street or an improved private street approved by the Land Use Board.

No open space provided around any principal building for the purposes of complying with the front, side, rear or other yard provision of this chapter shall be considered as providing open space for meeting the same requirements for another principal structure. Only one building and its accessory building shall be erected on one lot unless otherwise provided.

Structures permitted within the required open space on nonconforming lots. Balconies, roof eaves, uncovered decks, fireplaces and chimneys attached to residences may project into required open spaces, provided the structure does not exceed 360 square feet in total area, is not enclosed and does not extend any closer than 10 feet to any lot line and is not closer than 20 feet to any adjoining structure. Decks on conforming lots shall not be restricted as to this size limitation of 360 square feet.