Required standards. The Building Department shall grant a permit only to single-family dwellings for the creation, legalization or construction of an accessory dwelling unit (ADU): (i) within or as an addition to an existing main building in all single-family residential zones (R-80, R-60, R-40, R-30, R-20, R-15, R-10, R-7.5 and R-5); (ii) within an existing detached accessory building in all single-family residential zones, provided the existing accessory building meets all the requirements of this chapter; and (iii) within a new detached accessory building that meets all the requirements of this chapter only in the R-80, R-60, R-40, R-30, R-20 and R-15 residential zones, subject to any applicable building and fire code standards and subject to these standards:
[1] Number of ADUs per lot. There shall be no more than one ADU per lot.
[2] Owner occupancy. The owner of the single-family residence lot must reside as the owner's primary residence in either the main dwelling unit or the ADU.
[3] Floor area. An ADU shall have a minimum habitable floor area of 300 square feet and a maximum habitable floor area of 1,000 square feet. Notwithstanding the foregoing, an ADU shall not have a habitable floor area of more than 50% of the habitable floor area of the lot's primary dwelling.
[4] Bedrooms. The maximum number of bedrooms in an ADU shall be two, except that in R-10, R-7.5 and R-5 Zones, there shall be no more than a studio or one bedroom allowed in an ADU.
[5] Nonconforming main building. Notwithstanding any other provision of this chapter, an existing main building that is legally nonconforming with current dimensional or coverage regulations may be legally changed in use, in whole or in part, to an ADU, provided that the dimensional nonconformity is not increased and provided the height of an existing building that fails to meet setback requirements is not increased.
[6] Entrances. No new entrances to the street-facing façade of a main building may be added for the purpose of creating an ADU.
[7] Height of ADU. Notwithstanding any other provisions of this chapter, the maximum building height shall be the lesser of: (1) 25 feet; or (2) the height of the one-family dwelling main building.
[8] Minimum term of rental. The rental term of an ADU shall be for at least six months.
[9] Parking. Single-family dwellings improved with an ADU shall have a minimum of a total of three off-street parking spaces with a minimum of one of the three off- street parking spaces designated for the ADU, except single-family dwellings located north of Route 119/White Plains Road and west of Broadway only require a minimum of a total of two off-street parking spaces.
[10] Certificate of owner occupancy. The owner of the property shall certify to the Village, in the form of an affidavit provided by the Building Department, that the owner resides at the single-family residence improved with an ADU as the owner's primary residence in either the main dwelling unit or the ADU. Such certification shall be made at the time of the initial application filed with the Building Inspector and after the sale or conveyance of the single-family residence.
[11] Adequacy of septic system. If the lot is serviced by a septic system, the owner must demonstrate that the existing septic system can handle the addition of any ADU by securing the necessary permits from the Westchester County Department of Health.
[12] Land Use Board review. No Land Use Board review is necessary for an ADU permit that complies with the requirements in this Subsection
B(15)(b) except if: (i) (a) a new addition to an existing one-family dwelling is created for the ADU and the addition increases footprint, square footage or FAR, triggering the requirement for Planning Board site plan approval under §
305-132A(1); (b) an existing garage is converted to an ADU resulting in the need for on-site parking triggering the requirement for Planning Board site plan approval under §
305-132A(2); and/or (c) there is a change, addition or modification to land or buildings designated as an historic district or historic landmark by the Village Board triggering the requirement for Planning Board site plan approval under §
305-132A(3); and/or (ii) Architectural Review Board approval under §
9-4A(4).