19 Tex. Admin. Code § 100.1079
Improvements to real property. Section 100.1101 of this title (relating to Improvements to Real Property) applies to a charter holder unless the charter holder amends its open-enrollment charter to include a statement expressly adopting the provisions of Texas Education Code (TEC), Chapter 44, Subchapter B, as the charter holder's process for awarding a contract for the construction, repair, or renovation of a structure, road, highway, or other improvement or addition to real property. If such a statement is included in the open-enrollment charter, then the provisions of TEC, Chapter 44, Subchapter B, control in lieu of § 100.1101 of this title. Nothing in this section shall require a charter holder to comply with TEC, Chapter 44, Subchapter B, except when awarding a contract for the construction, repair, or renovation of a structure, road, highway, or other improvement or addition to real property.
19 Tex. Admin. Code § 100.1079