The $10,000 Chassis Cut: How the New Federal Housing Act Will Physically Redesign Manufactured Homes

For half a century, every manufactured home built in the United States has carried a heavy, hidden burden. Underneath the floorboards of these factory-built houses sits a permanent steel chassis—a 10- to 12-inch-deep metal frame equipped with axles and a drawbar. This requirement, written into federal law in 1974, was designed for an era when "mobile homes" were genuinely mobile. But today, roughly 95 percent of manufactured homes are transported exactly once, from the factory to their final foundation, where they remain permanently. Despite this reality, the law has forced buyers to purchase and keep the transportation system attached to their living room floor forever.[2]

That era is now ending. In late June 2026, the United States Congress passed the bipartisan 21st Century ROAD to Housing Act, a sweeping legislative package that officially eliminates the permanent chassis requirement for manufactured homes. The legislation, which cleared the Senate 85-5 and the House 358-32, represents the most significant physical change to factory-built housing in decades. By allowing builders to remove and reuse the steel transport frame, the new law fundamentally redesigns how these homes are constructed, shipped, and installed.[2]

The immediate impact of the chassis cut is financial. The steel frame is one of the most expensive single components of a manufactured home. According to estimates cited by lawmakers, eliminating the requirement to permanently affix the chassis will reduce the cost of a new unit by $5,000 to $10,000. For a housing segment that serves as the nation's largest source of unsubsidized affordable housing, a price reduction of up to 9 percent could put homeownership within reach for thousands of additional families.[3]

The mechanical process of chassis removal is straightforward but transformative. Under the new paradigm, manufactured homes will still be built in climate-controlled factories and transported to their final sites using a steel chassis. However, once the home is lifted onto its permanent foundation—whether a concrete slab, piers, or a basement—the chassis will be unbolted, removed, and transported back to the factory to be reused for the next house. This recycling loop eliminates the massive material waste of burying thousands of pounds of single-use steel under every new home.[3]

Beyond the cost savings, removing the chassis unlocks unprecedented design flexibility. The mandatory 12-inch steel frame historically forced manufactured homes to sit unnaturally high off the ground, requiring skirting to hide the underbelly and steep ramps or stairs for access. Without the chassis, these homes can be set flush with the grade, allowing for lower profiles that seamlessly integrate into traditional site-built neighborhoods. This aesthetic shift is crucial for overcoming the persistent local zoning resistance that has long stigmatized factory-built housing.[1]

The legislative victory follows a parallel regulatory push by the Department of Housing and Urban Development (HUD). Just weeks before Congress passed the ROAD to Housing Act, HUD issued a proposed rule aimed at spurring multistory manufactured housing. The agency's proposal sought to redefine the HUD Code so that only the lowest level of a multistory unit required a chassis, freeing upper floors from the structural and financial burden of steel frames and brake-equipped axles. HUD estimated that change alone would save consumers up to $6,600 per multistory unit.[1]

The convergence of HUD's regulatory update and Congress's legislative mandate signals a unified federal effort to modernize the HUD Code. Established in 1974, the HUD Code is a single, preemptive federal building standard that supersedes local building codes. This preemption is the primary reason manufactured homes are so affordable; builders can mass-produce identical units without navigating a patchwork of thousands of different municipal regulations.[2][3]

However, the elimination of the chassis requirement has sparked fierce pushback from an adjacent sector: the modular building industry. While manufactured homes and modular homes are both built in factories, they are legally and structurally distinct. Modular homes are built to state and local building codes, just like traditional site-built houses, and have never required a permanent chassis. Because they must comply with local codes, modular homes are generally more expensive to produce than manufactured homes.[3]

Modular builders argue that the chassis was the primary physical distinction between the two types of housing. By allowing manufactured homes to be placed directly on foundations without a steel frame, the modular industry warns that the federal government is blurring the lines between the two products. In public comments submitted to HUD, modular associations expressed concern that manufactured home builders will now be able to sell virtually identical products while bypassing the stringent local building codes that modular builders are forced to follow.

Proponents of the change dismiss these concerns as protectionist, arguing that the HUD Code's rigorous safety and energy standards are more than sufficient. They point to the severe national housing shortage as proof that outdated regulations must be discarded. Last year, only 102,700 manufactured homes were built in the United States—a sharp decline from the 300,000 units averaged annually throughout the 1970s and 1990s. Advocates believe that lowering costs and improving aesthetics will help restore those historic production levels.[1]

The chassis removal also has profound implications for financing. Historically, because manufactured homes were built on a transportation chassis, they were often classified as "personal property" (like a vehicle) rather than "real property" (like a house). This classification forced many buyers into high-interest chattel loans instead of traditional mortgages. While the ROAD to Housing Act does not automatically reclassify all manufactured homes, removing the physical transportation system makes it significantly easier for these units to qualify for standard, federally backed mortgages, provided they are placed on a permanent foundation.[3]

The final hurdle for the chassis cut is the President's desk. With the legislation having passed both chambers with overwhelming bipartisan majorities, it awaits a signature to become law. If enacted, the transition will not happen overnight. Manufacturers will need to retool their assembly lines to accommodate removable chassis systems, and local zoning boards will have to adjust to a new class of factory-built homes that look indistinguishable from site-built properties.

Ultimately, the end of the permanent chassis requirement represents a philosophical shift in American housing policy. For fifty years, federal law treated manufactured homes as inherently transient structures, prioritizing their ability to be moved over their quality as permanent residences. By severing the tie to the steel frame, the government is finally acknowledging that these structures are not vehicles, but homes—and regulating them accordingly.[3]