Factory-built housing gets a regulatory opening
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Factory production transformed cars, electronics and industrial equipment by bringing work into controlled environments where processes could be standardized, labor could be organized around repeatable tasks and purchasing could be centralized, yet US homebuilding still depends heavily on construction methods performed piece by piece across individual sites.
Factory-built housing has long promised a different model, with components or entire sections of a home produced in controlled facilities where manufacturers can reduce exposure to weather delays, coordinate labor more efficiently and create greater consistency in material use and production schedules.
The commercial results, however, have remained limited relative to that promise, because only 28,000 of the 1,019,000 single-family homes completed in the US in 2024 used modular or panelized and pre-cut construction methods, according to National Association of Home Builders analysis of Census Bureau data, leaving offsite construction with a market share of about 3%, unchanged from 2023.
A new federal housing law now seeks to remove several barriers that have constrained broader adoption, and the 21st Century ROAD to Housing Act, signed into law July 11, contains provisions aimed directly at manufactured and modular housing.
For manufacturers, developers and lenders, the law matters less because it signals federal support for factory-built homes and more because it attempts to address operating constraints that have made industrialized housing difficult to scale across a fragmented construction market.
The new law targets costs that have little to do with manufacturing efficiency
Factory-built housing is not a single construction category, because manufactured homes are largely completed in factories and regulated under federal construction standards administered by the Department of Housing and Urban Development, while modular homes are assembled from factory-produced modules that must comply with the state and local building codes governing the location where the finished property will stand.
That distinction creates different regulatory and commercial problems for each segment, particularly because manufactured housing operates within a federal framework while modular producers remain exposed to a patchwork of local requirements that can influence design, approval and financing.
For manufactured housing, the new law changes a longstanding requirement that homes be built on a permanent chassis, with the statutory definition now allowing manufactured homes to be produced with or without one, subject to revised HUD standards.
The Wall Street Journal reported that removing the permanent steel frame could reduce the cost of constructing some manufactured homes by $5,000 to $10,000, which could materially affect pricing in a segment aimed heavily at lower-cost housing.
The law goes further by requiring states to treat qualifying manufactured homes without permanent chassis on comparable terms with conventional manufactured homes across areas such as financing, taxation, insurance, transportation and installation.
Modular housing faces a different set of constraints, which is why the law requires HUD to review Federal Housing Administration construction financing programs and identify provisions that may restrict participation by modular developers, including the structure of construction draw schedules.
The financing issue matters because the cash cycle of factory construction differs from that of conventional building, with modular producers often requiring more capital earlier because materials, labor and assembly costs accumulate inside the factory before finished modules arrive at the development site.
A site-built project typically draws financing as work progresses at the property, but a modular producer can incur substantial costs before enough visible work exists at the site to trigger payments under a conventional construction loan.
A financing system designed around traditional site-built construction can therefore leave an otherwise viable factory project short of working capital at the point when production spending is highest, creating a mismatch between industrial production economics and real estate finance.
Under the new law, HUD must publish its review within one year of enactment, after which a rulemaking process must examine an alternative draw schedule for modular and manufactured home developers.
The policy shift could remove an important source of friction, but financing represents only one part of a broader operating challenge that continues to limit the growth of factory-built housing.
Factory economics still collide with a fragmented construction market
Manufacturing delivers its strongest economics when a factory can produce predictable volumes, standardize work, maintain consistent workflows and keep expensive equipment and trained employees operating at high levels of utilization.
Housing markets rarely provide those conditions, because a modular producer may sell into multiple municipalities with different permitting procedures, inspection practices and local building requirements, meaning a design that works smoothly in one jurisdiction may require changes in another.
The March 2026 executive order on residential construction recognized that problem by directing HUD to develop regulatory best practices for state and local governments, including recommendations that authorities reconsider restrictions imposed on manufactured or modular housing purely because of the way the home is constructed.
The issue is particularly significant for modular housing because the federal government does not provide the same nationwide construction standard that applies to manufactured homes, while the new housing law continues to define a modular home as one whose factory-produced modules comply with the applicable state and local building codes of the destination.
For manufacturers, the result is a business model in which the product may be produced centrally while the regulatory environment remains local, creating a structural tension between the standardization required by manufacturing and the variation embedded in local housing markets.
Factories also carry substantial fixed costs, including production space, machinery, specialized equipment and trained labor, all of which become more difficult to absorb when order volumes are irregular or plants operate below capacity.
A conventional builder can often adjust activity across individual sites as demand changes, but a manufacturer with an underused plant may continue carrying industrial infrastructure without enough output to spread those costs efficiently across finished units.
Transportation creates another constraint because completed modules must move from factories to construction sites, which places practical limits on plant location, unit dimensions and the geographic markets that a facility can serve economically.
Site preparation also remains part of the equation because foundations, utility connections, permitting, cranes, finishing work and installation still take place locally, meaning factory production can industrialize a large part of the construction process without turning housing into a conventional manufactured product.
The economics of factory-built housing therefore depend on coordinating two operating systems that function very differently, with a centralized production line needing repetition and predictable throughput while a decentralized real estate market continues to depend on individual sites, local regulations and project-specific financing.
The opportunity is bigger than prefab, but scale remains the test
The strongest case for factory-built housing may not rest on the idea that every future home should arrive on a truck, but on the possibility that residential construction can borrow more heavily from manufacturing methods that reduce variation, improve scheduling and make labor and material flows more predictable.
Standardized components can reduce unnecessary design variation, controlled production environments can improve scheduling, centralized procurement can simplify material flows and repetitive tasks can be organized around specialized workers and equipment rather than reconstructed separately at each building site.
Those principles can influence housing production even in markets where fully modular construction does not become dominant, because the underlying opportunity concerns the industrialization of selected construction processes rather than the replacement of site-built housing as a whole.
Recent policy changes could make that model easier to pursue by lowering manufactured-home costs, reconsidering construction financing structures and encouraging state and local governments to examine rules that distinguish between homes primarily on the basis of construction method.
None of those changes, however, creates demand by itself, and the roughly 3% offsite share of single-family construction in 2024 shows that technical capability has not yet translated into broad commercial adoption.
Manufacturers still need sustained development pipelines, lenders need to become comfortable with cash cycles that differ from conventional construction and local authorities need rules that accommodate factory-built methods without introducing enough variation to weaken the economics of standardization.
The next stage for the industry will therefore depend less on proving that houses can be manufactured efficiently and more on connecting manufacturing economics with the rest of the housing system, because a factory requires repeatable production, a developer requires workable finance, a local authority requires code compliance and a buyer requires a home in a specific place.
The new federal law reduces some of the distance between those requirements by addressing several longstanding regulatory and financing constraints, but factory-built housing will only gain meaningful market share if those changes translate into the one condition industrial production has always required: steady volume.
Source:
The Wall Street Journal
