There exists an almost absurdly simple fix that could help ease the housing crisis. It would cost the government nothing, require deleting just five words from a 50-year-old federal law, and has enjoyed quiet support from housing researchers and leaders for decades.

The target is an obscure regulation that requires every manufactured home to be built on a “permanent chassis” — a steel trailer frame that can attach to wheels. The idea was that the chassis was necessary — even after the home was installed and the wheels taken off — because manufactured houses, which trace their roots to World War II trailers, could theoretically be moved. Yet by the mid-1970s, most never left their original site, and the chassis remained unused, notable only as a design feature that made the homes stick out.

Getting rid of this “permanent chassis” mandate could make manufactured homes — already home to 21 million Americans, most of whom earn under $50,000 a year — more attractive, more socially accepted, and even more affordable than they already are.

Roughly 100,000 new manufactured homes are produced each year, but production is down sharply from the 1970s, just before the rule took effect. With 152 existing factories already capable of producing these types of homes, industry leaders say striking the chassis requirement could help scale up manufacturing by hundreds of thousands of houses, especially if paired with zoning reforms. The policy tweak could offer real relief for the housing crunch, especially for first-time buyers and older adults looking to downsize.

Although the change seemed simple to implement, lawmakers failed to amend the mandate for over three decades. There wasn’t overwhelming opposition to the proposal, but just enough resistance to nudge politicians toward issues more likely to boost their political capital. But as the housing crisis has intensified nationwide, pressure on Congress to use one of its few direct tools to boost housing supply has become harder to ignore.

Advocates of eliminating the chassis rule think victory might finally be in reach: The Senate Banking Committee is expected to take up the issue in a hearing later this month, as part of a housing package sponsored by Tim Scott, the committee’s Republican chair.

The permanent chassis rule and its history offer a window into how smart ideas that could solve real problems can still languish for decades in the fog of federal process. But it also shows what it takes to move even obvious reforms from inertia to action.

The rule

Nearly 40 years ago, policy experts began to notice a troubling trend: For the first time since the Great Depression, homeownership rates were dropping and home prices were going up, partly due to higher interest rates. In 1990, the typical first-time homebuyer earned about $23,400 annually — enough to afford a home up to $59,600, according to the Los Angeles Times, citing data from the National Association of Realtors. But the median price of a new single-family home was roughly $129,900, and existing homes weren’t much cheaper, with a median price of $97,500.

But there was a bright spot: manufactured homes. Built in factories on assembly lines, these homes benefit from standardized materials, streamlined labor, and weather-controlled conditions, making them significantly less expensive than traditional site-built housing.

Though long associated with dingy mobile trailers, by the late 20th century many manufactured houses were nearly indistinguishable from site-built ones, offering full kitchens, pitched roofs, and front porches. Nearly 13 million people lived in them.

Consumers buying manufactured homes “are demonstrating a preference for new construction that is less spacious, has a simpler design with fewer amenities, and uses less expensive materials,” read

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