Notwithstanding the provisions of M.G.L. c. 148, §§ 26E and 26F, all buildings or structures occupied in whole or in part for residential purposes, and not regulated by M.G.L. c. 148, § 26A, 26B or 26C after their initial sale for occupancy shall upon resale, conveyance or transfer of such buildings or structures be equipped by the seller with hard-wired smoke detectors,
946 CMR, § 7.14