A.
Purpose. The purpose of this section is to:
(1)
Increase the number of dwelling units available for use and occupancy in Town;
(2)
Adapt properties that are situated in a Single-Family Residential Zoning District so they are supportive of residents at a variety of stages in their lifecycle;
(3)
Encourage greater diversity and support of all populations with particular attention to young adults, senior citizens, and those with disabilities;
(4)
Encourage a more economic and efficient use of the Town's housing supply while maintaining the appearance and character of the Town's single-family neighborhoods; and,
(5)
Provide homeowners with a means of obtaining rental income to defray housing costs.
C.
Procedural requirements.
(1)
A Protected Use Accessory Dwelling Unit (PADU) that conforms to the requirements contained herein shall be permitted "as-of-right," as defined in MGL c. 40A, § 1A, as an accessory use to a Principal Dwelling. This shall not be subject to a Special Permit, or any other discretionary zoning approval from the Zoning Board of Appeals, as long as it meets the criteria herein.
(2)
An application to obtain a building permit for a PADU shall include a site plan, floor plans, and elevations that meet all requirements as laid out by the Town's Building Inspector to reflect all changes. The application shall be submitted showing all proposed interior and exterior changes to existing buildings or new buildings and improvements on a lot associated with a proposed PADU.
(3)
Accessory apartments, of any size, previously allowed pursuant to a Special Permit or Variance granted by the Zoning Board of Appeals, shall be deemed a Protected Use Accessory Dwelling Unit hereunder and shall not be subject to any conditions stated in said Special Permit or Variance, including but not limited to owner occupancy, number of tenants, familial tenancy, and parking spaces. Furthermore, any Restrictive Covenants recorded at the Middlesex South Registry of Deeds related to said accessory apartment shall be deemed null and void and have no further force or effect. Finally, no additional ADUs shall be permitted on a lot with a previously approved accessory apartment.
(4)
If the proposed PADU is located in a Floodplain District, the construction of a PADU shall be subject to the provisions and requirements of § 190-46 of the Zoning Bylaw.
(5)
PADUs that require an off-street parking space shall be subject to Site Plan Approval administered by the Zoning Board of Appeals. No Unreasonable Regulations, terms or conditions shall be placed upon the PADU as part of the Site Plan Approval in that PADUs are "as-of-right" as defined in MGL c. 40A, § 1A.
(6)
An applicant may request relief from limitations set forth in this chapter, including those regarding Gross Floor Area and setbacks, by seeking a Special Permit from the Zoning Board of Appeals, provided that no Special Permit shall allow more than one ADU on a Lot. The Zoning Board of Appeals shall not impose any conditions in conflict with 760 CMR 71.03.
D.
Use and dimensional requirements.
(1)
One Protected Use Accessory Dwelling Unit (PADU) shall be permitted per lot in a Single-Family Residential Zoning District as an accessory use to a Principal Dwelling. No additional ADUs shall be permitted on the Lot. This provision shall not be subject to a variance or Special Permit.
(2)
The use of a Lot or structures thereon shall not require owner-occupancy, number of bedrooms restrictions, limitations to the number of tenants, or require familial tenancy in the Principal Dwelling or PADU consistent with 760 CMR 71.03.
(3)
Except as otherwise stated herein, the PADU shall not exceed 900 square feet or half of the Gross Floor Area of the Principal Dwelling, whichever is smaller, in total square footage. A property owner may increase the size to a maximum of 1,200 square feet by obtaining a Special Permit to do so from the Zoning Board of Appeals.
(4)
PADUs or the Principal Dwelling they are accessory to shall not be used as a Short-Term Rental.
(5)
A PADU within a Principal Dwelling shall be accessed through a shared lobby/entry hall with the Principal Dwelling or a dedicated exterior entrance, separate from that of the Principal Dwelling.
(6)
A PADU that is attached to the Principal Dwelling shall meet the setback requirements for the Principal Dwelling applicable in the zoning district in which the lot is located. A PADU that is detached from the Principal Dwelling must meet the setback requirements for an accessory building set forth in § 190-20H.
(7)
PADUs, whether part of the Principal Dwelling or detached from it, shall not be subject to the maximum building coverage regulation, FAR, or minimum lot size as outlined by the Table 2, Table of Dimensional Regulations of this chapter.
(8)
The construction of a PADU shall not require the existing Principal Dwelling or an existing detached Accessory Building in which the PADU is proposed to be brought into compliance with this chapter neither the use or dimensional requirements, including, but not limited to, those as outlined in Table 2, Table of Dimensional Regulations of this chapter.
(9)
If the detached PADU is located over a garage, the first-floor garage space, unless dedicated to the PADU, is not included in the overall square footage limitations contained herein.
(10)
A detached PADU is permitted to be a Modular Dwelling Unit and installed on a foundation. This clause shall not supersede any Building Code requirements.
E.
Parking requirements.
(1)
There is a zero parking requirement for PADUs constructed on a Lot within a 0.5 mile radius of any Transit Station. A Lot shall be considered to be within the half mile radius if any portion of the Lot touches that half mile radius from the location of the Transit Station.
(2)
One space per unit shall be provided on-site if all portions of the Lot are located outside of a 0.5 mile radius from a Transit Station.