Plans and specifications for new business buildings or for alterations to existing business buildings, where the estimated cost of the work is $25,000.00 or more, shall be prepared by and shall bear the name, seal, and registration number of a registered Architect. Architects shall be registered in the State of Texas. Such certification shall be required on business buildings costing less that $25,000 if deemed necessary by the building official, whether same be an alteration or new construction. For the purposes of this section, all buildings shall be considered business except the following: one and two family dwellings, including customary accessory buildings; lumber sheds; buildings of less than 400 square feet which are located 20 feet or more from the nearest property line.
(1986 Municipal Code, Title 5, Chapter 1, Section 5-1-5)