The Housing Supply Expansion Act of 2025 updates federal regulations to expand the definition of manufactured homes by allowing them to be built without a permanent chassis, not just on one. The bill affects states and the federal government by requiring states to certify within one year (or two years for states with biennial legislatures) that their laws treat chassis-less manufactured homes the same as traditional manufactured homes in areas like financing, insurance, titles, and taxes. States that fail to submit these certifications by the deadline will be prohibited from manufacturing, installing, or selling these new types of homes. The Department of Housing and Urban Development will coordinate with other federal agencies to ensure consistent treatment across federal law and maintain a public list of compliant states. The legislation aims to increase housing supply by making it easier to produce affordable manufactured homes without the cost and complexity of building them on a permanent chassis.
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