30 states still need to update their laws for chassis-free manufactured homes — and your mortgage access may depend on it

The state compliance problem nobody is talking about

The federal chassis requirement is gone — but the state laws that copied it are still on the books in most of the country.

When the 21st Century ROAD to Housing Act became law on July 11, 2026, it removed the 52-year-old mandate that every manufactured home be built on a nonremovable steel chassis. That change is now federal law. The problem is that state manufactured housing codes in roughly 30 states still contain their own "permanent chassis" language, copied from the old federal rule, and those states must now align before July 11, 2027.

A Stateline investigation published October 20 — drawing on Pew Charitable Trusts housing research — documented the scale of the gap. Rachel Siegel of Pew told Stateline that the chassis definition "is really pervasive" across state statutes, appearing not just in dwelling definitions but in titling rules, zoning classifications, and installation standards. Updating it "may not be as easy as striking a few words."

A Stateline review found "permanent chassis" still written into manufactured housing statutes in Virginia, Maine, New York, Missouri, South Carolina, Washington, Nevada, and Maryland, among others.

Three states have already moved: North Carolina, Tennessee, and Texas have each updated their manufactured home definitions to align automatically with federal HUD standards, so any changes HUD makes flow through without additional legislative action.

Why this matters to buyers: mortgages

The financing stakes are large. Manufactured homes titled as personal property — as most are today, because a chassis permanently attached to the home prevents real-property titling in many states — can only be financed with chattel loans (home-only loans), not conventional mortgages.

According to a Pew brief cited by Stateline, a typical $100,000 mortgage for a manufactured home saves a borrower roughly $49,000 over the life of the loan compared to the chattel alternative. The higher-rate chattel loan isn't a judgment about the borrower's credit; it is a function of how the home is legally classified.

Removing the chassis requirement is supposed to make it easier for chassis-free homes to be titled as real estate — but only if states update their titling rules to match. "If we're going to title manufactured homes without a chassis the same way as we're titling manufactured homes with a chassis, let's make sure that that process is as streamlined and makes the most sense for what these modern homes are today," Siegel told Stateline.

Experts also note that chassis-free homes could eventually be less expensive to produce. The Lincoln Institute of Land Policy estimates removing the chassis could cut construction costs by $5,000–$10,000 per unit by eliminating a heavy steel underframe that serves no structural purpose once a home is installed.

What this means for foldable and expandable prefab buyers

None of the models in the Foldable Home Store catalog are HUD Code manufactured homes, so this state-law compliance issue does not directly affect them:

• Boxabl Casita: certified under state modular programs (CA, TX, AZ, NV, NM, SC) — a different regulatory track from the HUD Code entirely.
• Chinese expandable container homes (CHOMEX, JEEZOO, PackPrefab, Chery, Feekercn, etc.): carry no HUD or U.S. residential certification.
• ANSI park-model THOWs (MagicSlide 2X): built to RV/park-model code, not HUD Code.

The buyers who stand to gain from state-law updates are those looking at conventional manufactured homes built by Clayton, Cavco, Skyline Champion, and similar HUD Code producers — not the expandable container category.

That said, as HUD eventually publishes final chassis-free rules and states update their statutes, the regulatory boundary between "manufactured home" and "modular home" is likely to blur. Designs that would today require a state modular approval may eventually have a path through the HUD Code — potentially at lower cost. That is a multi-year prospect, not a current-market reality.

Deadline and next steps

States have until July 11, 2027 to certify that they will treat manufactured homes with and without a chassis equally. States whose legislatures meet only in odd years have until July 11, 2028. Buyers in states that miss the deadline will face continued restrictions on chassis-free placement and real-property titling until their legislatures act.

Watch your state's manufactured housing agency website for any rulemaking or legislative action. If you are buying in one of the states still carrying chassis language — Virginia, Maine, New York, Missouri, South Carolina, Washington, Nevada, Maryland, and others — consult a real estate attorney before signing a purchase contract that depends on real-property titling for a factory-built home.