Housing for the 21st Century Act: A Plain-English Breakdown of Congress's Most Bipartisan Bill

In a Congress where nearly every vote splits down party lines, H.R. 6644 — the Housing for the 21st Century Act is a genuine anomaly. The House passed it 390–9 on February 9. The Senate advanced it to the floor 90–8 on March 4. And on March 10, senators voted 89–9 to invoke cloture on the substitute amendment — clearing the last major procedural hurdle before final passage.

That's three lopsided votes in a month on a single piece of legislation. For context, the SAVE America Act passed 218–213. The Iran war powers resolution failed 47–53. This bill is operating in a different political universe.

Here's exactly what H.R. 6644 does — in plain English — and what still stands between it and the President's desk.

Why Is Congress Acting Now?

The math on housing has become politically untenable for both parties. The United States is short an estimated 4 million homes, according to economists, after years of underbuilding following the 2008 financial crisis. A 2025 HUD report to Congress found that worst-case housing needs — defined as very low-income renters paying more than half their income in rent or living in severely inadequate housing — hit an all-time high of 8.5 million households.

Home prices have risen 60% since 2019, according to Harvard University's Joint Center for Housing Studies. The median single-family home in 2024 cost roughly five times the median household income — well above the ratio economists consider affordable.

With the November 2026 midterms approaching, housing affordability ranks as a top voter concern in swing states from Nevada to North Carolina. Neither party could afford to be caught blocking action. That's the political context behind the vote totals.

What the Bill Actually Does

H.R. 6644 is a supply-side bill. It doesn't create large new federal spending programs — which is a big reason it attracted Republican support. Instead, it removes regulatory friction that makes housing harder and more expensive to build. Here's the breakdown by provision:

1. Streamlines Environmental Reviews

The bill cuts bureaucratic timelines under the National Environmental Policy Act (NEPA) for residential construction projects. Housing developers have long argued that NEPA reviews — sometimes lasting years — add cost and delay without proportionate environmental benefit. The bill sets clearer deadlines and establishes a more efficient review process specifically for housing.

2. Overhauls Manufactured Housing Rules

The federal chassis requirement — a structural standard that made it harder to site manufactured homes in many jurisdictions — is eliminated. This is a significant zoning-reform provision that both parties called a breakthrough. Factory-built homes can cost significantly less per square foot than site-built housing, and removing the chassis requirement makes them easier to place on more types of lots.

3. Modernizes FHA Multifamily Loan Limits

The bill updates Federal Housing Administration loan limits for multifamily housing to reflect current construction costs — limits that haven't kept pace with inflation, effectively pricing many new apartment projects out of federal financing programs.

4. Expands Bank Investment in Affordable Housing

Nationally chartered banks are currently capped at investing 15% of their capital in public welfare projects, which includes affordable housing. The bill raises that cap to 20%, making more private capital available for affordable housing development.

5. Vacant-to-Residential Conversions

The bill makes it easier to convert vacant office buildings, retail spaces, and other commercial properties into apartments — a priority in many cities where commercial real estate vacancies spiked after the pandemic.

6. Restricts Corporate Home Purchases

Companies that own more than 350 single-family homes would be prohibited from purchasing additional single-family properties. This provision drew support from President Trump and was framed as protecting individual buyers from being outbid by institutional investors. It is also one of the more contested provisions in the Senate's version of the bill.

7. CDBG Reporting Requirements

Recipients of Community Development Block Grants would be required to report on their local land-use policies — including zoning restrictions that limit housing density. This is designed to create accountability for localities receiving federal funds while maintaining zoning policies that restrict supply.

The Vote Breakdown

The House vote broke down as: Republicans 192 Yea – 8 Nay; Democrats 198 Yea – 1 Nay. That's near-universal agreement from both caucuses — rare for any significant legislation in the 119th Congress, which set a modern partisanship record in 2025.

In the Senate, the bill has been shepherded by a bipartisan pairing that's unusual in the current political climate: Sen. Tim Scott (R-SC), chair of the Senate Banking Committee, and Sen. Elizabeth Warren (D-MA) — two senators who rarely find common cause. Scott framed it as delivering on the President's State of the Union housing promises. Warren emphasized the corporate landlord restrictions.

Who Sponsored It

The bill consolidated more than 30 individual housing bills that cleared the House Financial Services Committee through three major hearings in 2025. Rep. French Hill (R-AR), as committee chairman, drove the package. Rep. Emanuel Cleaver (D-MO) called it historic and praised its broad bipartisan backing.

The Senate Banking Committee simultaneously advanced a companion bill — the ROAD to Housing Act (S. 2651) — unanimously. The Senate substitute amendment (SA 4308) that cleared cloture on March 10 is a merged version incorporating elements of both bills.

Where the Resistance Comes From

Industry groups that broadly support the bill have flagged one specific provision for potential trouble in reconciliation: a requirement that large institutional investors sell newly built rental housing after seven years of ownership.

The Mortgage Bankers Association, the National Association of Home Builders, and several other groups released a joint statement calling their support for the Senate bill "strong" — but warning that the seven-year rule "would take hundreds of thousands of housing units off the market over the next decade, many of which would serve lower- and middle-income households." The National Association of Realtors and the National League of Cities support the bill as written.

A Senate provision that would ban the establishment of a federal digital currency is also expected to generate debate during amendment votes, as cryptocurrency remains a contentious issue with significant lobbying interest on both sides.

What Happens Next

With cloture on the substitute amendment now invoked, the Senate is proceeding through amendment votes. Final Senate passage is expected within days. Once the Senate passes its version, the bill heads to a House-Senate conference to reconcile the differences between the original H.R. 6644 and the Senate substitute — including the seven-year institutional investor provision and the CBDC ban.

If conferees can produce an agreed-upon final text, the bill returns to both chambers for final votes before going to President Trump's desk. Given the margins in both chambers, passage is widely expected — though the contested provisions could slow the process.