Getting a modular building to your Texas site involves its own transport permit process, separate from the TDLR certification the building itself carries. Here’s what actually governs moving a modular building or portable classroom on Texas roads.
The TxDMV Portable Building Single-Trip Permit
Texas gives modular and portable buildings their own transport permit rather than lumping them in with general oversize freight. The TxDMV Portable Building Single-Trip Permit covers a load up to 14 feet high and 80 feet long for a flat $15 fee — multiple modules can even be loaded end-to-end at their narrowest width, up to 80 feet of total length with no more than 4 feet of rear overhang. Anything larger needs a general single-trip permit instead, which runs $60 plus a weight-based highway maintenance fee.
Escort (pilot car) requirements
Escort requirements for manufactured housing and portable buildings kick in at 16 feet wide (one escort) and 18 feet wide (front and rear escorts). Our standard modules ship at 12 feet wide — comfortably under that threshold — which keeps most Texas deliveries logistically simple and less expensive than a wider load would be.
Who handles the paperwork
The supplier we connect you with handles the permit application and escort coordination as part of your delivery, so you don’t have to interpret TxDMV paperwork yourself. That’s true whether you’re buying new, buying used, or relocating a modular building you already own from one Texas site to another.
Frequently asked questions
Can I move a used portable classroom within Texas without a permit?
No — any load exceeding Texas’s standard legal size limits needs a TxDMV permit, whether it’s a brand-new building or a used one you already own being relocated to a new site.
Do I need a pilot car escort for a standard classroom or office module?
Not usually. Our standard modules ship at 12 feet wide, under the 16-foot threshold where Texas requires an escort. Wider specialty units may require one.
Matt Banes, iModular.com President — 38 years in the modular building industry, serving California and Texas buyers. Last updated: September 17, 2026.
Explore more
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