Texas covers 268,000 square miles and the home improvement needs in El Paso are nothing like the needs in Beaumont. DFW gets severe hail that damages roofing and siding. Houston deals with hurricane-force winds and flooding that require specific building practices. San Antonio's expansive clay soils cause foundation movement that affects every system in the house. Austin's explosive growth means thousands of homes built fast with builder-grade materials that are aging out 15 to 20 years in.
Building codes vary by city. Dallas uses the 2021 International Residential Code with local amendments. Houston operates under its own municipal code. San Antonio and Austin have adopted energy efficiency requirements that exceed state minimums. Your contractor needs to know the specific requirements where you live, not just general Texas codes.