34 Pa. Code § 403.81 – Stop work order.

(a) A building code official may issue a written stop work order when the official determines that construction violates the Uniform Construction Code or is being performed in a dangerous or unsafe manner. The stop work order is to contain the reasons for the order and list the required conditions for construction to resume.
(b) The building code official shall serve the stop work order on the permit owner or the owner’s agent by certified mail or personal service.
(c) A person who continues construction after service of a stop work order, except for construction work that is necessary to remove a violation or an unsafe condition, may be subject to the penalties under section 903 of the act (35 P.S. § 7210.903). A building code official may seek enforcement of a stop work order in a court of competent jurisdiction.

This section cited in 34 Pa. Code § 403.102 (relating to municipalities electing to enforce the Uniform Construction Code).