Section 25. Registration of Architects Required. —

No person shall practice architecture in this country, or engage in preparing architectural plans, specifications or preliminary data for the erection or alteration of any building located within the boundaries of this country or use the title "Architect," or display the word "Architect" together with another word, or display or use any title, sign, card, advertisement, or other device to indicate such person practices or offers to practice architecture, or is an architect, unless such person shall have received from the Board a Certificate of Registration and be issued a Professional Identification Card in the manner hereinafter provided and shall thereafter comply with the provisions of this Act.

A foreign architect or any person not authorized to practice architecture in the Philippines, who shall stay in the country and perform any of the activities mentioned in Sections 3 and 4 of this Act, or any other activity analogous thereto, in connection with the construction of any building/structure/edifice or land development project, shall be deemed engaged in the unauthorized practice of architecture.