Section 81S. In the case of a subdivision showing lots in a residential zone, any person, before submitting his definitive plan for approval, may submit to the planning board and to the board of health, a preliminary plan, and shall give written notice to the clerk of such city or town by delivery or by registered mail, postage prepaid, that he has submitted such plan.

In the case of a nonresidential subdivision, any person before submitting his definitive plan for approval shall submit to the planning board and the board of health, a preliminary plan, and shall give notice to the clerk of such city or town by delivery or by registered mail, postage prepaid, that he has submitted such plan.

In either case, if the notice is given by delivery, the city or town clerk shall, if requested, give a written receipt therefor. Within forty-five days after submission of a preliminary plan, each board shall notify the applicant and the clerk of the city or town, by certified mail, either that the plan has been approved, or that the plan has been approved with modifications suggested by the board or agreed upon by the person submitting the plan, or that the plan has been disapproved and in the case of disapproval, the board shall state in detail its reasons therefor. The planning board shall notify the city or town clerk of its approval or disapproval, as the case may be. Except as is otherwise provided, the provisions of the subdivision control law relating to a plan shall not be applicable to a preliminary plan, and no register or deeds shall record a preliminary plan.