Certain lots are exempted from current dimensional requirements by MGL c. 40A, § 6. In addition, any increase in lot area, width, depth, yard or frontage requirements shall not apply to erection, extension or alteration or moving of a structure on a lot not meeting current dimensional requirements, provided that, as of June 25, 1978, such lot was a legal building lot and had lot area of at least 5,000 square feet and street frontage of at least 50 feet. Any structure proposed to be to be located on such lot shall conform to the setback requirements in effect at the time of the recording or endorsement of the deed or plan creating the lot; provided, however, that if there are no applicable setbacks, the front yard setback shall be 20 feet and the side and rear yards setbacks shall be 10 feet.
[Amended 5-2-2005 ATM, Art. 26]