The HUD code is the short name for the Manufactured Home Construction and Safety Standards — the federal regulations (found at 24 CFR Part 3280) that every manufactured home built since June 15, 1976 must meet. It's the only national building code in the United States: a site-built house in San Antonio answers to city inspectors, but a manufactured home built in a Texas factory answers to Washington, no matter which state it lands in. For a buyer, the code matters for a simple reason — it's the paper trail that proves the home you're looking at was inspected, tested, and approved before it ever left the factory floor.
"HUD" is the U.S. Department of Housing and Urban Development. Its Office of Manufactured Housing Programs writes the standards, approves the inspection agencies, and investigates defects — for every factory home in the country.
What does the HUD code actually cover?
Nearly everything about how the home is designed and built. The major areas:
- Structure: floor, wall, and roof construction; the steel chassis; how the sections join on a multi-section home.
- Fire safety: flame-spread limits on interior finishes, smoke alarms, egress windows in every bedroom, and two exterior doors placed apart from each other.
- Wind, snow, and heat: each home is engineered for specific wind, roof-load, and thermal zones — more on those below.
- Plumbing, electrical, and HVAC: full system standards, tested at the factory before the home ships.
- Energy: insulation and window requirements by climate zone.
- Transport: the home has to survive its own highway trip, so the code covers tie-downs, frames, and running gear too.
What the code does not cover is the installation at your site — foundations, anchoring, and utility hookups fall under separate federal installation standards and, in Texas, under TDHCA's state installation rules. That split matters when something goes wrong: a factory defect is a HUD matter; a bad setup is an installer matter. Part 5 covers installation in the buying process.
Who inspects a manufactured home?
Inspection happens in the factory, continuously, while the home is being built — not once at the end. Two kinds of HUD-approved third parties run the system: a design agency reviews and approves every floor plan and engineering package before production starts, and an in-plant inspection agency watches homes move down the line, checking work at each station. A home can't ship until it passes.
Texas adds its own layer. The TDHCA Manufactured Housing Division licenses the retailers who sell homes, the installers who set them, and it inspects installations after the home is placed. So by the time a family in Atascosa County gets their keys, the home has been checked in the factory under federal rules and its setup checked under state rules.
What is the red certification label?
The certification label — most people call it the HUD tag — is a red metal plate, about two inches by four inches, riveted to the outside of the home. It's stamped with a unique label number and certifies that the section it's attached to was built and inspected under the HUD code. Every transportable section gets its own tag, so a singlewide has one, a doublewide two.
Where to look: the rear end of the home (the end that faced backward during transport), a foot or so up from the bottom edge. On older homes it may be painted over — run a hand along the wall if you can't spot it.
HUD never reissues labels. Instead, IBTS — the Institute for Building Technology and Safety — can search the federal record by serial number and issue a Label Verification Letter, which lenders and insurers accept in place of the physical tag. It's a small fee and worth every penny on an older home.
What is the data plate, and where do I find it?
The data plate is the label's paper sibling — a printed sheet mounted inside the home, usually in one of three places: inside the electrical panel door, in a kitchen cabinet near the sink, or on a bedroom closet wall. It lists the manufacturer, plant, serial numbers, manufacture date, the appliances installed at the factory, and — most useful of all — three small maps showing the wind zone, roof load zone, and thermal zone the home was built for.
When you tour a used home, photograph the data plate. Those few square inches answer half the questions a lender, insurer, or transporter will ask later.
How do wind zones work in Texas?
The HUD code divides the country into three wind zones. Most of Texas — including San Antonio, Bexar County, and the whole Hill Country — is Wind Zone I. Counties along the Gulf Coast carry higher Zone II or Zone III ratings, which require stronger construction and anchoring.
The rule that trips people up: a home built for Zone I can't be installed in a Zone II or III county. The reverse is fine — a coastal-rated home can go anywhere. If you're buying a used home from the coast or plan to move a home toward it someday, check the wind map on the data plate before you commit. Roof load and thermal zones work the same way; in South Texas, the standard south-zone ratings are what you'll see on nearly every local home.
Has the HUD code kept up with modern homes?
Yes — and the pace has picked up. HUD adopted large updates in 2021 and again in 2024, and the 2024 changes were the biggest in decades: they cleared the way for multi-unit manufactured homes (think duplexes), attached garages and carports, open floor plans, and more modern kitchen and window designs. That's part of why new manufactured homes look so different from what was on lots even ten years ago.
The practical takeaway for a buyer: the year a home was built tells you which version of the code it met. A 1996 home and a 2026 home both carry red labels, but the newer home was built to stricter energy and safety rules. That difference shows up in what homes cost and in how insurers price them.
Frequently asked questions
Does a manufactured home have to pass city inspections in San Antonio?
The home itself, no — federal law preempts local building codes for the structure. The installation, utility connections, and any site-built additions (porches, garages, carports) do fall under state and local rules.
What's the difference between the HUD label number and the serial number?
The label number is stamped on the red exterior tag; the serial number is stamped into the steel frame and printed on the data plate. Records systems use both, so note both when you're researching a home.
Can I look up a home's history by its label?
Yes. IBTS can verify the federal manufacturing record, and TDHCA's online records show Texas ownership, location, and lien history by label or serial number. Both searches are cheap insurance before buying a used home.
Is a home without a red label worthless?
Not worthless, but harder. If it was built after June 1976, an IBTS Label Verification Letter usually restores its standing with lenders and insurers. If it was built before 1976, no letter exists — it's a pre-code mobile home, and cash buyers set its market.
Who do I contact about a defect in a new manufactured home?
Start with your retailer and the manufacturer's warranty. In Texas, TDHCA handles consumer complaints against licensed retailers and installers, and HUD's manufactured housing office handles construction-standard defects. Keep everything in writing.