Congress Turns to Factory-Built Homes

US lawmakers are again looking at factory-built manufactured homes as one of the fastest ways to ease the housing affordability crisis. With home prices high, mortgage rates elevated and renters under pressure, Congress is weighing changes to decades-old rules that have limited the sector’s growth.

Manufactured housing returns to Washington’s agenda

Bloomberg reported that Congress is focusing on manufactured homes as a possible answer to the US housing shortage. These are not temporary trailers. In federal housing policy, manufactured homes are factory-built dwellings constructed under national standards, transported to a site and used as permanent housing.

The central reform concerns a technical but costly rule. Since the 1970s, manufactured homes have been required to be built on a permanent steel chassis. A chassis is the metal frame used to move the home from a factory to its destination. Once the home is installed, that structure is usually no longer needed, yet it still affects price, design, height and neighborhood acceptance.

For lawmakers, the rule has become part of a wider affordability debate. The US has spent years with too few homes, and the jump in mortgage rates after 2022 made ownership far less reachable for middle-income households. That has pushed both parties to consider supply-side reforms that could expand housing without a large new federal spending program.

Why a steel frame became a housing issue

The Housing Supply Expansion Act of 2025 would modernize the federal definition of manufactured housing and allow homes without a permanent chassis after transport and installation. Supporters say the change would give builders more design flexibility, reduce costs and help manufactured homes fit more easily into conventional urban and suburban neighborhoods.

Pew Charitable Trusts estimates that ending the chassis requirement could reduce the cost of a manufactured home by as much as $10,000, or about 7% to 9% for an average single-section unit. In the affordable housing market, that difference matters: the initial purchase price often determines whether a household can move from renting to ownership.

The issue is not just the cost of steel. A permanent chassis limits architecture, makes multistory designs more difficult, complicates basements and keeps many homes visually tied to the older image of mobile housing. That can reinforce resistance from local governments and residents, even when the unit is intended to be a permanent home.

A cheaper product remains a constrained market

Manufactured homes already play an important role in the lower-cost segment of US housing. They are built in controlled factory conditions, face fewer weather delays and allow standardized production. That can reduce labor costs, material waste and construction time compared with fully site-built homes.

The sector, however, has not become a mass-market answer to the housing shortage. The US Census Bureau’s Manufactured Housing Survey tracks shipments, prices and characteristics of new manufactured homes, showing that the category is a distinct part of the national housing system rather than a marginal niche.

Barriers remain at several levels. Lenders are often more cautious when financing these homes, especially when the buyer owns the structure but not the land beneath it. Local zoning rules can restrict placement in single-family neighborhoods. Many buyers and local officials still associate the product with older mobile homes, even though modern manufactured units can meet stronger standards for safety and energy efficiency.

A housing shortage makes the reform bipartisan

The Bipartisan Policy Center says the 21st Century ROAD to Housing Act combines House and Senate housing proposals and includes measures to expand supply, revise federal programs and address institutional investor activity in single-family housing. In a Congress often divided on housing policy, broad bipartisan support is notable.

Realtor.com estimated that the cumulative US housing deficit exceeded 4 million homes in 2025. Harvard’s Joint Center for Housing Studies reported that nearly half of renter households spend more than 30% of income on rent and utilities, a threshold commonly used to define housing cost burden. Those figures explain why lawmakers are searching for faster ways to add lower- and middle-cost homes.

Manufactured housing is appealing because it does not require the same multiyear construction cycle as traditional development. Factories can build faster than scattered sites, and standardization can lower costs. But one federal rule change will not be enough. Local zoning reform, better financing and stronger protections for buyers who do not own their land will also be needed.

Land and local rules remain the main constraint

Even if Congress eases federal rules, a manufactured home still needs a place to go. Much of US housing policy is controlled by cities, counties and states. Local rules can ban certain home types, set minimum lot sizes, require expensive infrastructure or restrict density.

That means chassis reform may lower the cost of a home but will not automatically produce a building surge in expensive urban markets. Where land is costly and permits take years, savings of several thousand dollars can be absorbed by land prices, utility connections and approval delays.

Land tenure is another risk. Many manufactured-home owners buy the home but rent the pad in a community. If land rent rises, the home can become difficult to sell because moving it is expensive and technically complicated. Expanding manufactured housing without addressing land ownership may reduce entry costs but fail to provide long-term stability for some households.

Investors see demand, but policy will decide scale

Manufactured housing has become a clearer asset class for investors. Demand is supported by the low affordability of traditional homes, aging households, migration to lower-cost regions and a shortage of rental housing for middle-income families. But rising institutional ownership can also trigger political concerns if residents face higher land rents or weaker bargaining power.

Lawmakers are trying to balance two goals. Private capital is needed to build homes, upgrade communities and expand supply. At the same time, excessive dependence on large owners could increase vulnerability for residents who own the home but not the underlying land.

For the US housing market, manufactured homes are not a full substitute for traditional construction. They can cover part of the shortage in lower-cost single-family housing, especially in regions with available land, population growth and flexible zoning. In expensive coastal markets, the impact will depend on whether local governments allow denser and more adaptable forms of development.

As experts at International Investment report, Congress’s turn toward manufactured homes is pragmatic but limited. Removing the permanent chassis requirement could eliminate one artificial barrier and reduce costs for some projects, but the US housing crisis was not created by a single rule. It reflects expensive land, years of underbuilding, high mortgage rates, local restrictions and uneven buyer protections. Without zoning and financing reform, factory-built housing will remain useful but insufficient.

FAQ

What are manufactured homes in the US?

Manufactured homes are factory-built dwellings constructed under federal standards, transported to a site and installed for permanent use. They should not automatically be equated with old-style trailers or temporary housing.

Why is Congress discussing manufactured homes?

Lawmakers see them as a way to expand affordable housing supply faster. They are usually cheaper and quicker to produce than homes built entirely on site.

What is a permanent chassis?

A permanent chassis is the steel frame used to build and transport a manufactured home. After installation, it is often no longer needed, but current rules still require it as part of the structure.

How could removing the chassis requirement lower costs?

Allowing builders to remove the chassis after delivery, or design homes without a permanent frame for permanent installation, could reduce material costs, improve design flexibility and expand the types of homes that can be built.

Can manufactured homes solve the US housing crisis?

They can help, but they are not a complete solution. Land costs, local zoning, mortgage finance and infrastructure remain major barriers to broader affordability.