Casita Coalition played a central role in crafting major ADU financing rules and describes the new statute as one of the most important federal housing updates in decades

/PRNewswire/ -- Effective at midnight on June 10, the 21st Century ROAD to Housing Act took effect as law, delivering one of the largest federal housing initiatives in years and signaling a clear policy turn toward boosting housing supply, broadening attainable ownership, and easing obstacles to lower-cost home construction.

The measure contains 45 housing provisions that update federal housing rules, improve financing access, reinforce manufactured and modular housing, and simplify the process for homeowners, builders, and localities to add new units.

Among the changes are major updates to Accessory Dwelling Unit (ADU) financing that Casita Coalition helped develop during the past year with congressional offices, lenders, housing experts, and national partners.

"Housing affordability starts with housing supply," said Noerena Limón, CEO of Casita Coalition. "For years our housing rules have made building homes more difficult than necessary. This law shows growing bipartisan agreement that we cannot fix America's affordability challenge unless we help homeowners and communities create additional housing."

Unlike many federal housing measures that mainly subsidize demand, the 21st Century ROAD to Housing Act targets supply growth by tackling barriers that have kept lower-cost options - including ADUs, manufactured homes, modular units, starter homes, and other middle housing - from reaching full scale.

Why This Matters

For homeowners, builders, lenders, and communities the statute removes or starts to address several long-standing obstacles that have restricted housing output.

Among its most important measures the law:

Expands options for second-position financing for ADUs, enabling more homeowners to add units without refinancing existing low-rate first mortgages.
Eliminates outdated federal restrictions on manufactured housing, opening more routes to lower-cost ownership.
Advances financing and regulatory steps that support modular and off-site construction methods.
Contains numerous further reforms aimed at raising housing production, improving affordability, and modernizing federal programs.

Collectively these steps can widen attainable ownership while enlarging the country's housing inventory.

Why California Should Pay Attention

California has spent nearly ten years showing that easing barriers to small-scale housing delivers results.

Since 2017 the state has permitted more than 144,000 accessory dwelling units, turning ADUs from a limited product into one of its quickest-growing sources of new homes. The federal changes extend that progress by tackling one of the largest remaining hurdles: financing.

Many homeowners holding low-interest mortgages currently face a tough decision: refinance at today's higher rates to fund an ADU or drop the project. The law's ADU financing rules create fresh paths for second-position lending, letting more owners add housing while keeping their current mortgage intact.

"This legislation could reshape how homeowners finance ADUs," said Dan Hardcastle, Vice Chair of Casita Coalition's Board of Directors, who helped shape the coalition's financing recommendations. "Millions of homeowners have been effectively blocked from building an ADU because they could not justify losing a low-rate mortgage. Removing that barrier could unlock thousands of additional homes."

The statute also brings key updates for manufactured housing by ending the permanent chassis requirement, a long-sought change that trims costs, improves financing choices, and allows more flexible designs including two-story models.

"The housing shortage has reached a stage where every workable solution merits serious review," said Katherine Peoples, Chair of Casita Coalition's Board of Directors. "This legislation shows what becomes possible when Republicans and Democrats unite around one goal: making it simpler to build more homes. It marks an important advance toward expanding ownership chances for the next generation of Americans."

The Work Begins Now

While the signing marks a historic step, successful implementation will decide the law's full impact.

Casita Coalition will keep working with federal agencies, financial institutions, state officials, local governments, and industry partners to carry out the legislation, broaden financing for ADUs and middle housing, and spot further reforms needed to ease America's housing shortage.

"The housing conversation is shifting," Limón said. "Communities across the political spectrum increasingly see that we cannot fix an affordability crisis without building more homes. This law will not solve the shortage alone, but it supplies homeowners, lenders, builders, and communities with valuable new tools to do exactly that."

About Casita Coalition

Casita Coalition is a California-based nonprofit advancing practical answers to the housing shortage through middle housing, including accessory dwelling units (ADUs), starter homes, manufactured housing, modular housing, townhomes, and other types that widen attainable ownership and grow housing supply.

Media Contact:
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SOURCE Casita Coalition