From the ordinance
Nothing contained in this chapter shall require any change in the plans, construction or designated use of any building complying with the local laws in force prior to this chapter if a permit shall have been duly issued prior to the date of first publication of notice of the public hearing on this chapter; or the entire building shall have been constructed in accordance with such plans as have been filed with the town and shall have been completed within one year from the effective date of the ordinance from which this chapter is derived.