Every commercial modular building or portable classroom installed in Texas has to pass through the Texas Department of Licensing and Regulation’s Industrialized Housing and Buildings (IHB) Program before it ships. If you’re evaluating a modular building for your school, church, business, or job site, here’s exactly what that certification covers — and what it doesn’t.
What TDLR’s IHB program covers
Commercial modular buildings and industrialized housing built at a factory and transported to a Texas site fall under TDLR’s Industrialized Housing and Buildings Program — Chapter 1202 of the Texas Occupations Code, Title 16 of the Texas Administrative Code, Chapter 70. TDLR licenses the manufacturers, requires inspection of each building at the factory by a Texas-approved third-party inspector, and issues a permanent TX insignia (decal) once the building passes. If you’ve worked with modular buildings in California, this is the Texas equivalent of the state approval label issued by HCD.
The codes your building is built to
Since July 1, 2024, industrialized housing and buildings certified under this program must meet the following mandatory codes:
- International Building Code (IBC), 2021 Edition
- International Residential Code (IRC), 2021 Edition
- International Fuel Gas Code (IFGC), 2021 Edition
- International Mechanical Code (IMC), 2021 Edition
- International Plumbing Code (IPC), 2021 Edition
- International Energy Conservation Code (IECC), 2015 Edition
- International Existing Building Code (IEBC), 2021 Edition
- National Electrical Code (NEC), 2020 Edition
What TDLR certification does NOT cover
TDLR’s IHB program certifies the building unit itself. Your local city or county still handles the site-specific side — the installation permit, foundation, and utility connections — the same split you’ll find in most states. Because requirements can vary by jurisdiction and by how the building will be used, always confirm scope with TDLR and your local building department before finalizing a project. We walk every Texas buyer through this so there are no surprises during permitting: a room used for classes is treated differently than a room used for assembly or worship under code, and occupancy classification affects exiting, occupant load, and fire protection requirements regardless of the fact that the building is modular.
Frequently asked questions
Is a TDLR-certified modular building held to a lower standard than site-built construction?
No. TDLR-certified buildings are built to the same IBC-family codes referenced above, inspected at the factory by a Texas-approved third-party inspector, and carry a permanent state insignia confirming compliance — a level of factory quality control site-built construction doesn’t get.
Does TDLR certification cover my foundation and utility hookups?
No. TDLR certifies the building unit itself. Foundation design, utility connections, and site work are handled through your local city or county permitting process, separate from the state-level TDLR certification.
Matt Banes, iModular.com President — 38 years in the modular building industry, serving California and Texas buyers. Last updated: September 17, 2026.
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