This bill aims to modernize federal housing assistance by amending Title I of the National Housing Act, primarily by increasing loan limits and clarifying eligible uses. A key provision explicitly allows property improvement loans to be used for the construction of accessory dwelling units , thereby expanding housing options and promoting denser development. The legislation also significantly raises the maximum loan limits for various property improvements and manufactured housing purchases. Specifically, the loan limit for improvements to single-family structures increases to $75,000, and for multi-unit structures, it rises to $150,000. New, higher limits are established for the purchase of single-section and multi-section manufactured homes, both with and without a developed lot. The bill grants the Secretary of Housing and Urban Development greater flexibility to set and periodically reset these dollar amount limitations, including for ADU construction, based on Federal Housing Administration goals. Furthermore, the legislation mandates the Secretary to develop or choose a method for annually indexing these loan limits within one year of enactment, ensuring they remain relevant to market conditions. It also extends the maximum loan term to up to 30 years as determined by the Secretary. Finally, the bill requires the Department of Housing and Urban Development to conduct a comprehensive study on the cost-effectiveness of factory-built housing , analyzing cost reductions, waste efficiency, maintenance, and potential applications beyond single-family homes.