The Housing Supply Expansion Act of 2025 expands the definition of manufactured homes to include units built without a permanent chassis, a change designed to increase housing options and supply. The bill requires the Secretary of Housing and Urban Development to establish new safety standards and labeling requirements for these chassis-free manufactured homes so they can be clearly distinguished from traditional ones. States must certify within one year (or two years for states with biennial legislatures) that their laws treat chassis-free manufactured homes the same as traditional manufactured homes in areas like financing, title, insurance, and taxes; states that fail to certify by the deadline will be prohibited from manufacturing, installing, or selling these homes until they comply. The legislation also directs HUD to provide model guidance to help states meet certification requirements and coordinates with other federal agencies to ensure consistent treatment of the expanded manufactured home definition across federal law.
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