1. (a) Single family residential dwellings, as defined in §388.002 of the Health and Safety Code, that are newly constructed or reconstructed shall comply with §388 of the Health and Safety Code (Texas Building Energy Performance Standards).
2. (b) Effective January 1, 2012, the Texas State Energy Conservation Office adopted the 2009 International Residential Code (Chapter 11) as the state-mandated energy code for all residential construction, one- and two-family residences of three stories or less above grade.
3. (c) For construction activities that have a Start of Construction Date on or after September 1, 2016, the Texas State Energy Conservation Office through Health and Safety Code, Chapter 388 has adopted Chapter 11 of the 2015 International Residential Code as the energy code in Texas for single family residential construction.

Source Note:The provisions of this §21.4 adopted to be effective January 8, 2017, 41 TexReg 10596.