780 CMR, ch. 1, pt. 2, 104, 104.6
Where it is necessary to make an inspection to enforce the provisions of 780 CMR, or where the building official has reasonable cause to believe that there exists in a structure or upon a premises a condition which is contrary to or in violation of 780 CMR which makes the structure or premises unsafe, dangerous or hazardous, the building official is authorized to enter the structure or premises at reasonable times to inspect or to perform the duties imposed by 780 CMR, provided that if such structure or premises be occupied that credentials be presented to the occupant and entry requested. If such structure or premises is unoccupied, the building official shall first make a reasonable effort to locate the owner or other person having charge or control of the structure or premises and request entry. If entry is refused, the building official shall have recourse to the remedies provided by law to secure entry, including, but not limited to requesting an administrative search warrant. See also M.G.L. c. 143, §§ 6 and 50.
780 CMR, ch. 1, pt. 2, 104, 104.6