Federal mortgage insurance for backyard apartments—who benefits?
H.R. 4568 — Supporting Upgraded Property Projects and Lending for Yards (SUPPLY) Act · Filed by Sam Liccardo (D-CA) · 47 cosponsors · Introduced Jul 21, 2025 · Referred to committee
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What it does
This bill creates a federal mortgage insurance program for second mortgages used to finance accessory dwelling units (ADUs)—small residential units added to single-family homes. Homeowners can borrow up to 30% of a standard home loan limit (or more if rental income is projected), and the federal government insures the lender against default. Fannie Mae and Freddie Mac are permitted to buy and resell these insured loans, expanding the secondary market.
Why we flagged it
The bill's operative mechanism is a new federal mortgage insurance program and secondary-market authorization. It is not a subsidy or tax carve-out, but rather a credit-risk transfer that expands access to capital for a specific housing product (ADUs). The civic benefit (housing supply, affordability) is paired with private gain (lenders and GSEs capture reduced risk and transaction volume).
What the text implies
- The bill permits Fannie Mae and Freddie Mac to securitize ADU loans, potentially creating a new asset class and expanding GSE balance sheets without explicit congressional appropriation or capital requirement.
- Rental income can increase the maximum loan amount by up to 50% of projected annual rent, creating incentive for speculative ADU construction in tight rental markets and potentially inflating property values.
- The Secretary has broad discretion to set terms, conditions, and underwriting standards, with minimal congressional oversight beyond annual reporting—implementation details that affect borrower protections are not specified in statute.
- The bill does not address zoning, local permitting, or regulatory barriers to ADU construction, so federal insurance may subsidize loans for units that cannot legally be built in many jurisdictions.
- No explicit requirement for affordability, rent caps, or long-term occupancy restrictions—the program may finance ADUs rented at market rates, benefiting property owners rather than low-income renters.
Section numbers refer to the bill text the analysis read — linked under Primary records below.
Who it affects
The bill lowers borrowing costs for homeowners building ADUs by shifting default risk to the federal government, potentially increasing affordable housing supply and enabling homeowners to generate rental income. The insurance premium (capped at 1% annually) is modest, and the program is discretionary—the Secretary can decline to insure loans deemed risky.
Who stands to gain
- mortgage lenders and banks (reduced default risk via federal insurance)
- Fannie Mae and Freddie Mac (new loan purchase and securitization volume)
- property owners and homebuilders (access to cheaper capital for ADU construction)
Named in the bill
Department of Housing and Urban Development (HUD), Federal Housing Finance Agency (FHFA), Federal National Mortgage Association (Fannie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), National Housing Act, Housing and Community Development Act of 1974
Where it stands
47 cosponsors: 39 Democrats, 7 Republicans, 1 Independents.
- Jul 21, 2025 — Introduced · Congress.gov: “Introduced in House”
- Jul 21, 2025 — Referred to House Committee on Financial Services · Congress.gov: “Referred to the House Committee on Financial Services”
Dates and quoted wording are Congress.gov's action record; the timeline shows status changes, not every procedural step.
Money around this bill
2 lobbying clients named this bill on 2 disclosure filings across 1 quarter, Jun 2026 to Jun 2026. Those filings disclosed $1,740,000 in lobbying spend. A filing names 46 bills on average, so that figure is what each filing reported, not a share belonging to this bill.
More lobbying clients named this bill than 41% of bills with at least one filing.
Sam Liccardo, the sponsor, reported $724,267 in PAC receipts in the 2026 cycle.
- Mortgage Bankers Association — $1,220,000 on 1 filing
- Zillow Group, Inc. — $520,000 on 1 filing
Lobbying Disclosure Act filings through Jul 20, 2026. A filing shows who paid to lobby on a bill it names, not what changed.
How this was measured
Analysis — Quorum's AI read the bill text published by Congress.gov (4,296 characters) on Jun 3, 2026. Section numbers in the findings refer to that text, linked below; transparency and hidden-provision scores are compared against the median of 16,222 analysed bills.
Status and sponsors — Congress.gov's bill record — actions, committee referrals and cosponsors — loaded nightly. The timeline shows status changes, not every procedural action.
Money — Senate Lobbying Disclosure Act filings whose specific-issue field names this bill for quarters ending Jun 2026 to Jun 2026. A filing's amount is reported whole beside the median number of bills a filing names; it is never divided across them. PAC receipts are FEC-reported contributions to the sponsor's candidate committee in the 2026 cycle.
As of — lobbying records through Jul 20, 2026 · page rendered 2026-10-20.
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