U.S. House Passes Bill Eliminating Steel Chassis Rule for Tiny Homes

The U.S. House overwhelmingly passed the Housing for the 21st Century Act, H.R. 6644, a housing reform bill that includes a provision repealing the federal requirement that all manufactured homes be built on a permanent steel chassis. For the tiny home on wheels community, the change is significant: the chassis rule has long been the regulatory mechanism that classified THOWs as recreational vehicles rather than permanent housing, a distinction that has complicated everything from zoning approvals to financing.

The chassis requirement has drawn criticism for adding thousands of dollars per unit in construction costs while providing little practical benefit. As one industry analysis put it, "most manufactured homes remain in place permanently, meaning the chassis adds little functional value while increasing construction costs by thousands of dollars per unit." Beyond the cost burden, the mandate forced builders to design around a transport-focused blueprint that constrained creative layouts, ruled out certain foundation types, and made placement on smaller or denser lots far more difficult.

The affordability math here is hard to ignore. The average sales price of a manufactured home was $124,500 in March 2025, compared to $423,000 for site-built homes in the first quarter of the same year. Repealing the chassis mandate, analysts argue, would push that gap even wider by lowering production costs further and encouraging greater output at a moment when housing supply is critically short.

Analyst Meredith Whitney highlighted the proposed House and Senate bills as a reform "that could materially lower production costs and support wider adoption of factory-built housing across the country." Manufactured housing producers such as Champion Homes have already seen market movement on the news, with one headline citing a 12.3% stock jump for the company following the proposed repeal.

The bill still needs to clear the Senate before it reaches the president's desk. Yahoo Finance references companion Senate proposals that Whitney noted, but no Senate bill number or vote has been confirmed in available sources. Until the legislation is fully enacted, the chassis rule remains federal law, and the full cost and design benefits the industry is anticipating remain unrealized.

What the House passage does signal, clearly, is that federal appetite for modernizing manufactured housing rules is real. The chassis requirement, a regulatory artifact built around the assumption that manufactured homes travel, has long frustrated builders and advocates who see factory-built housing as one of the most scalable solutions to the country's housing shortage. Removing that steel-frame constraint could finally let THOWs be treated as what most of them already are: permanent homes.