On July 11, 2026, the 21st Century ROAD to Housing Act became Public Law 119-101 without the President's signature after passing the Senate 85 to 5 and the House 358 to 32.1, 2, 3 The bipartisan package was led in the Senate by Tim Scott of South Carolina and Elizabeth Warren of Massachusetts, with French Hill of Arkansas and Maxine Waters of California leading the House negotiations.4 It has been described as the most significant federal housing legislation in decades.

That description is probably fair. But no one should expect the law to produce an immediate drop in rents or home prices. Its importance is more structural. It attempts to make housing easier to finance, approve, build, and preserve. Whether it eventually makes housing more affordable will depend on what federal agencies, Congress, states, and municipalities do next.

The national effect: More tools for increasing supply

The law begins with the correct diagnosis. America has not built enough housing in the places where people most want and need to live.

One widely cited estimate from Realtor.com places the national housing shortage at approximately 4.03 million homes in 2025, following more than a decade of underbuilding.5 That figure is not simply a count of missing physical units. Its methodology includes approximately 1.82 million potential households that might have formed under more affordable housing conditions but instead continued living with parents, relatives, or roommates.

Even with that qualification, the underlying supply problem is clear. Limited construction has contributed to higher prices, fewer options for renters, and a homeownership market that is increasingly inaccessible to younger households.

The ROAD to Housing Act does not override local zoning. Instead, it directs the Department of Housing and Urban Development to develop voluntary zoning and land-use guidelines. The law expressly prohibits federal preemption and prevents the department from penalizing jurisdictions that decline to adopt those guidelines.6

The law also establishes competitive grants to help governments and regional planning agencies update zoning codes, improve permitting and inspection capacity, coordinate housing with transportation, and implement local housing plans. A separate program supports the adoption of "prereviewed designs," also known as pattern books, for accessory dwelling units, duplexes, townhouses, and other covered housing types. These grants support planning, permitting, and administrative capacity. They cannot be used for construction, alteration, or repair work.6

Beginning with the third full fiscal year after enactment, the law will adjust certain Community Development Block Grant allocations based on changes in local housing growth. Covered metropolitan cities and urban counties with a housing growth improvement rate below the median will receive a 10 percent reduction. The withheld funds will be redistributed to eligible recipients at or above the median, as well as jurisdictions with annual housing growth of at least 4 percent, using a formula based on recent additions to the housing stock. The law does not cap the bonus at 10 percent. It also excludes certain low-cost, high-vacancy, disaster-affected communities and jurisdictions that lack authority over zoning and permitting.6

This remains a modest incentive, but it represents an important change in federal policy. Some communities receiving federal development funding will face greater pressure to demonstrate measurable improvement in housing production.

Other provisions reduce federal barriers. The law streamlines certain environmental reviews and allows recipients to use up to 20 percent of future Community Development Block Grant allocations for new affordable housing construction. That authority applies only to funds appropriated after enactment.6 The law also modernizes the HOME Investment Partnerships Program, supports manufactured and modular housing, and creates programs intended to repair and preserve existing homes.

The law also prohibits large institutional investors with direct or indirect investment control of at least 350 single-family homes from making most future purchases of one- and two-unit homes. The prohibition takes effect 180 days after enactment, does not require investors to sell homes they already control, and expires 15 years after taking effect. It includes broad exceptions for build-to-rent developments, qualifying renovation programs, certain homeownership programs, and other specified transactions.6

The restriction may give individual buyers a better chance in some markets. Still, changing who owns a house does not create an additional house. The provisions that reduce barriers to new supply are likely to have a greater effect on long-term affordability.

The most important limitation is funding. Section 1202 states that no additional funds are authorized to carry out the law. Many grants, pilot programs, and administrative changes will therefore depend on existing funding or future congressional appropriations. The Congressional Budget Office did not estimate spending that remains subject to appropriation.6, 7 The legislation is closer to a national policy framework than a massive federal construction program.

Its national effect will be gradual. The law is intended to reduce costs and delays, but it cannot independently lower interest rates, expand the construction workforce, reduce material costs, or force municipalities to approve housing. Its success should be measured over years, not months.

The Massachusetts effect: Building on reforms already underway

Massachusetts may be particularly well positioned to benefit. The Commonwealth estimates that it needs 222,000 additional homes from 2025 through 2035 to close its existing shortage and meet projected demand.8 That requires producing roughly 22,000 homes annually, including substantially more housing near jobs, public transportation, and existing infrastructure.

Massachusetts has already begun making some of the policy changes the federal law seeks to encourage. The MBTA Communities Law requires 177 MBTA communities to establish at least one district where multifamily housing is permitted by right.9 The Affordable Homes Act also allows qualifying accessory dwelling units of up to 900 square feet by right in zoning districts where single-family homes are permitted.10

Federal planning grants, prereviewed-design programs, and production incentives could help communities turn those zoning changes into completed homes. A municipality that has rezoned land still needs staff to review plans, conduct inspections, update local procedures, and process permits. The ROAD to Housing Act can help close the gap between changing a zoning map and producing housing, provided that Congress funds the programs.

The federal law's treatment of single-stair apartment buildings is especially relevant. It directs the Department of Housing and Urban Development to issue model code language, best practices, and technical guidance for residential buildings of up to six stories using one internal stairway. The department must issue this guidance within 18 months. The guidance will be voluntary and will not itself change state or local building codes.6

Massachusetts generally requires apartment buildings above three stories to provide two means of egress, while the standard single-stair exception is limited to buildings of no more than three stories and 12 units. That requirement can make smaller apartment projects difficult to construct on narrow urban lots.11, 12

Governor Maura Healey issued Executive Order 651 in February 2026 directing state officials to evaluate a safe pathway for allowing single-stair multifamily buildings.11 Federal safety guidance could support that review and make it easier to build smaller apartment buildings that fit into the existing character of many Massachusetts neighborhoods.

Separate provisions could also benefit Massachusetts communities. The law allows a limited share of Community Development Block Grant funds to support new affordable housing construction, permits certain nonentitlement jurisdictions to use HOME Investment Partnerships Program funds for infrastructure directly connected to assisted housing, creates a whole-home repair pilot program, and establishes a permanent federal framework for Community Development Block Grant disaster recovery.6

These tools could be particularly valuable in older industrial cities, smaller rural communities, and areas recovering from major disasters. Their availability, however, will depend on each program's eligibility requirements and the availability of federal funding.

Federal legislation cannot resolve Massachusetts' housing crisis from Washington. Municipalities must allow projects to be built. State agencies must write workable regulations. Congress must fund the new programs. Builders must be able to finance construction, and communities must invest in the infrastructure needed to support growth.

The ROAD to Housing Act is meaningful, but it is not a shortcut. It gives the country, and Massachusetts in particular, better tools for confronting the housing shortage. The final question is whether government at every level will actually use them.