Any dwelling, building, or any structure hereafter erected in any district shall be located on a lot having not less than the minimum requirements set forth in Article III and Schedule A except as provided in Subsection B below.

A lot or parcel of land having an area, frontage, width, or depth of less amount than required by Schedule A may be built upon for residential purposes, provided such lot or parcel of land was shown on a plan endorsed with the words "approval under the Subdivision Control Law not required" or words of similar import, or described in a deed duly recorded or registered at the time of the adoption of this bylaw and at the time of such recording or endorsement, whichever is earlier; such lot complied with the minimum area, frontage, width, and depth requirements, if any, of the Zoning Bylaw then in effect; and did not at the time of such adoption adjoin other land of the same owner available for use in connection with such lot or parcel; and further provided that such lot has an area of 5,000 square feet or more and a frontage of 50 feet or more, is in a district zoned for residential use, such lot conforms except as to area, frontage, width, and depth with all other provisions of this bylaw and any proposed structure is to be located so as to conform with the minimum requirements of front, side and rear yard setbacks, if any, in effect at the time of such recording or endorsement, whichever is earlier, and to all other requirements of this bylaw.

The minimum front yard dimensions required in Schedule A are to be measured from the street line where a plan of the way or street is on file with the Registry of Deeds or in Town records or, in the absence of such a plan, from the line 30 feet from the parallel with the center line of the traveled way.

The limitation on height of buildings and structures shall not apply in any district to spires, domes, steeples, radio towers, chimneys, broadcasting and television antennas, bulkheads, cooling towers, ventilators and other appurtenances or ornamental features usually carried above the roof, which features are in no way used for living purposes, nor to farm buildings, churches, municipal or institutional buildings; provided, however, that the height of all structures exempted by this subsection shall not be more than four times the distance between the nearest lot line and the point directly below the specific structure. No wireless communications facility shall exceed 120 feet in height as measured from ground level at the base of the structure, except for an exemption for an existing structure as provided in Schedule B of this bylaw, and no wireless communications facility shall be located closer than 500 feet to the nearest structure used for residential purposes. A wireless communications facility on which wireless communications services co-locate may be constructed up to 150 feet in height, subject to the same provisions for maximum height and setbacks otherwise required within this subsection. Further, no building associated with any wireless communications facility shall exceed the maximum height and bulk or minimum yard requirements as set forth in Intensity Schedule A of this bylaw for any building within the applicable zoning district. The height and location limitations specified in this subsection for a wireless communications facility shall not apply to the construction or use of an antenna structure by a federally licensed amateur radio operator which is exempted under MGL c. 40A, § 3.

A corner lot shall have minimum front yards with depths which shall be the same as the required front yard depths for the adjoining lots. A corner lot in an I-60 and/or OP-60 Zone shall have 200 feet for lot frontage on the primary or principal street, a 300-foot lot line on the secondary way, and a setback of 60 feet from the secondary way; and, further, the boundary of the lot adjacent to the principal way shall be considered the front of the lot for Zoning Bylaw purposes.

Screening and buffers shall be required in any industrial or business district which adjoins a residential district as follows: this strip shall be at least 35 feet in width, it shall contain a screen of plantings in the center of the strip. The screen shall be not less than five feet in width and six feet in height at the time of occupancy of such lot. Individual shrubs or trees shall be planted not more than three feet on center and shall thereafter be maintained by the owner or occupants so as to maintain a dense screen year-round. At least 50% of the plantings shall consist of evergreens. A solid wall or fence, not to exceed six feet in height, complemented by suitable plantings may be substituted for such landscape buffer strip by special permit. The strip may be part of the yard area. Where an "I" or "C" District abuts an "R" District, no building within the "I" or "C" District shall be within 25 feet of the boundary line of the "R" District. Where this subsection conflicts with the sight triangle defined in § 290-20, then § 290-20 shall apply.

A building, except a boathouse or pump house, shall not be erected within a floodway or in any area subject to periodic flooding.

In the "R" Districts, an accessory building shall not occupy more than 25% of the required rear yard. An accessory building attached to or detached from the principal building shall be subject to front, side, and rear yard requirements applicable to the principal building, except that in all districts, the minimum side and rear yards for an accessory building not to exceed 200 square feet in area nor 12 feet in height, which is detached from the principal building, shall be 50% of the side and rear minimum yard setbacks as listed in Article IV, Intensity Regulations, Schedule A. Detached accessory buildings in the "C" and "I" Districts shall be located on the lot so as not to violate the minimum open space requirements set forth in Schedule A. An in-ground swimming pool or any appurtenant structure thereto shall be located neither within any required front yard nor within 15 feet from any side or rear lot line.

Existing residential uses in the "C" or "I" Districts shall be subject to the dimensional and density regulations of the nearest residential district as determined by the Building Inspector.

Except for community facilities, public utilities, and multifamily dwelling uses approved by special permit, only one principal structure shall be permitted on a lot. For a multifamily dwelling use, more than one principal building may be located on a lot, provided that the proposed development scheme is approved by the special permit granting authority (SPGA). If more than one principal building is located on a lot developed for a multifamily dwelling use, the distance between the buildings shall be at least 30 feet.

At each end of a through lot, there shall be a setback depth required which is equal to the front yard depth required for the district in which each street frontage is located.

Projections into required yards or other required open spaces are permitted subject to the following:

Where the existing development along a block amounts to more than 50% of the block frontage, and where said development has an average setback less than that required by this bylaw, then any vacant lot setback may be reduced to said average of the existing development.

On a lot which is split between a commercial and/or industrial zoning district and a residential zoning district, the required percentage of open space shall be obtained on that portion of the lot which is within the same zoning district as the principal use of the lot, expressed as a percentage of the area contained within the same zoning district as the principal use of the lot.

On any lot in an "I" District, exclusive of uses on lots within the IC-30 District listed in Article V, Schedule B, Principal Use, Retail and Service, the land area for the minimum open space calculation shall not include any land area set aside for a stormwater detention or retention basin.