§431:10C-112 Notice of cancellation or non-renewal; effect on term of coverage. (a) In any case of cancellation or refusal to renew, the insurer shall give written notice to the insured not less than thirty days prior to the effective date of the cancellation or refusal to renew. Cancellation or refusal to renew shall not be deemed valid unless supported by a certificate of mailing properly validated by the United States Postal Service.

(b) If the insurer has manifested in writing an offer to renew to the named insured at least thirty days prior to the end of the policy period and the offer is not accepted before the expiration of the policy term, the policy shall lapse upon that expiration date and section 431:10C-111 shall not apply. Notwithstanding other valid methods of acceptance, an offer shall be deemed accepted as of the date of mailing of the acceptance. The date of mailing may be evidenced by the postmark or a certificate of mailing properly validated by the United States Postal Service. [L 1987, c 347, pt of §2]