How to Finance an ADU: A New Option Just Became Law
The 21st Century ROAD to Housing Act cleared both chambers in June with overwhelming bipartisan support, 85-5 in the Senate, 358-32 in the House. Then Trump refused to sign it, protesting the Senate's inaction on an unrelated voter ID bill. Under the Constitution, a bill becomes law automatically if the president doesn't sign or veto it within 10 days. That clock ran out on July 11. The bill is now law, without his signature.
Coverage has centered on one headline provision. There's a second one buried inside that changes something for hosts building an ADU right now.
The Headline Provision: New Construction Gets Harder for Big Investors
Large institutional investors, defined as entities that own 350 or more single-family homes, are now barred from buying new single-family construction. For individual investors, this changes little directly, institutional investors make up only about 3% of the single-family rental market nationally, though their footprint is much heavier in specific markets like Atlanta.
The Real Find: ADU Construction Is Now an Eligible FHA Loan Use
Section 303 of the bill increases FHA loan limits for manufactured housing and adds accessory dwelling unit construction as an acceptable use for FHA-insured property improvement loans. In plain terms: An FHA Title I property improvement loan, a smaller, faster-to-close loan than a full refinance, can now be used specifically to fund building an ADU.
If you've been running the numbers on the Backyard ADU Blueprint or confirming your parcel supports one with our zoning guide, this is a real new financing lane worth checking with your lender. It's separate from the Fannie Mae rules covered in our ADU Math breakdown, so it's worth knowing that both paths exist before you pick one
The same section also removes the requirement that manufactured homes sit on a permanent chassis, which lowers production costs and opens up design and placement options for prefab units.
Other Ways to Finance an ADU
Title I isn't the only option, and it's often not the primary one. A HELOC or home equity loan typically allows for larger amounts than Title I's $25,000 cap, but requires real equity in your home. A cash-out refinance can fund a full build but means resetting your entire mortgage, often at a different rate than your current one. Fannie Mae's SEL-2025-08 update, covered in our ADU Math breakdown, lets some lenders count projected ADU rental income toward your qualifying income on a purchase or limited cash-out refinance, though that only applies to mid-term rental income, not nightly.
Which option makes sense depends on how much equity you have, how much the build costs, and whether you're financing the ADU alone or refinancing the whole property. Title I's real advantage is accessibility: No required equity, and a faster path to a smaller amount of capital.
Quick Answers
Does this ban all investors from buying homes? No. It only restricts entities owning 350 or more single-family homes, and only on new construction, not existing homes.
Can I use this to finance my ADU? Talk to your lender about Title I property improvement loan eligibility now that ADU construction is a named acceptable use. Terms and qualifications still depend on your lender and your specific project.
Why did it become law without the president's signature? The Constitution allows a bill to become law automatically if the president neither signs nor vetoes it within 10 days (excluding Sundays). Trump let that window close in protest of unrelated legislation.
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