Sponsors (17)
The bill substantially improves homeowners' access to affordable ADU financing and may expand affordable housing supply, but it shifts more mortgage risk onto taxpayers and GSEs, raises foreclosure and local-rent risks, and creates implementation uncertainty.
Homeowners and prospective buyers gain materially easier and lower-cost access to finance construction of ADUs through insured second liens and by allowing Fannie Mae/Freddie Mac to purchase and securitize ADU loans; loans can be increased based on projected ADU rent (up to 50%) and annual insurance premiums are capped at 1%, improving feasibility for many projects.
Expanded ADU lending and financing mechanisms are likely to increase the supply of lower-cost infill housing, helping renters and lower-income households find more affordable options.
A broad statutory definition of ADUs (including modular, manufactured, and conversions) widens the types of units that qualify and may speed construction and deployment of new units.
Taxpayers and the broader mortgage market face greater exposure and potential systemic risk because the bill both insures additional second liens (backstopped by government insurance) and permits Fannie Mae/Freddie Mac to acquire and securitize ADU loans, concentrating risk in public-sponsored entities.
Linking loan sizes to projected post-construction value and rental income may encourage overborrowing against primary homes, increasing foreclosure risk for homeowners—especially lower-income borrowers.
Program design and rulemaking discretion, together with FHFA's authority to prohibit activities on short notice, create regulatory and market uncertainty that could disrupt lenders, borrowers, and local implementation.
Based on analysis of 2 sections of legislative text.
Creates a HUD‑insured second‑lien program to finance accessory dwelling unit construction and allows Fannie Mae/Freddie Mac to buy/securitize those loans.
Creates a federal mortgage insurance program to cover discretionary second liens used to finance construction of accessory dwelling units (ADUs) on single-family properties, with loan size and underwriting limits, program rules, and reporting requirements; the Department of Housing and Urban Development must establish the program within two years. It also requires the FHFA Director to permit Fannie Mae and Freddie Mac to purchase and securitize these HUD-insured ADU construction loans, unless FHFA determines such purchases would cause excessive, unmanageable market risk.
Official title: To amend the National Housing Act to direct the Secretary of Housing and Urban Development to establish a program to insure certain second liens secured against property for the purpose of financing the construction of an accessory dwelling unit, and for other purposes.
Introduced July 17, 2025 by Sam T. Liccardo · Last progress July 17, 2025