§ 275. Special laws and local ordinances. The requirements of sections two hundred and seventy to two hundred and seventy-four, inclusive, are not in substitution for the requirements of any general or special law or local ordinance relating to the construction, equipment or maintenance of buildings, but the provisions of such general and special laws and local ordinances shall be observed as well as the provisions of said sections. The provisions of sections two hundred and seventy to two hundred and seventy-four, inclusive, shall supersede all provisions inconsistent therewith in any special law or local ordinance, and any provision of law or ordinance which gives power to any officer to establish requirements inconsistent with the provisions of such sections or the rules adopted by the board under the provisions of this chapter.