53 Pa. Stat. § 14921
All plans for the erection, construction, or alteration of buildings of the grade referred to in this act, for the alteration of houses already erected, or other buildings intended for occupancy for any other grade, besides being submitted to the bureaus now charged with the approval of the same, shall be submitted to the Chief of the Division of Housing and Sanitation, for his approval of the sanitary requirements of said plans and of the sanitary conditions surrounding the ground over which the proposed building is to be erected; and until such approval is obtained and indorsed on such plans the work for construction or alteration shall not begin. All plans for the installation or alteration of plumbing, ventilation, fixtures, cesspools, sinks, or privy-wells shall be submitted to the supervising inspector in charge of plumbing and house drainage, for his approval.
53 P.S. § 14921