Tex. Occ. Code § 1051.606
(a) This chapter does not apply to a person who does not represent that the person is an architect or architectural designer, or use another business or professional title that uses a form of the word "architect," and who:
(2) is a legally qualified architect residing in another state or country who:
(4) prepares the architectural plans and specifications for or observes or supervises the construction, enlargement, or alteration of a privately owned building that is:
(A) a building used primarily for:
(b) A person described by Subsection (a)(2) who agrees to perform or represents that the person is able to perform a professional service involved in the practice of architecture may perform an architectural service in this state only if, in performing the service, the person:
Added by Acts 2001, 77th Leg., ch. 1421, Sec. 1, eff. June 1, 2003; Renumbered from Occupations Code Sec. 1051.056 and amended by Acts 2003, 78th Leg., ch. 331, Sec. 3.11, 3.12, eff. Sept. 1, 2003.