Can Modular Housing Really Reach 10% of the U.S. Market? Let’s Do the Math—Honestly

 

Every few years, someone confidently announces that “this is the decade modular housing finally breaks through.” The number most often tossed around is 10 percent of all new U.S. homes. It sounds reasonable. It sounds achievable. And it sounds great on a conference stage.

But when you slow the conversation down and start doing real math—factory math, not marketing math—the picture changes quickly.

As of 2025, there are dozens of modular home factories operating across the United States, with most estimates placing the number somewhere between 50 and 100 facilities. The exact count is hard to pin down because factories open, close, consolidate, change ownership, or quietly downshift capacity. But even if we assume a healthy middle ground—say 60 active factories nationwide—the industry’s actual production footprint is far smaller than many people realize.

Today, modular housing represents roughly 3 percent of the U.S. new home market, translating to about 28,000 homes per year out of an annual total near 1.1 million starts. That’s progress compared to where we were decades ago—but it’s still a niche. A meaningful niche, yes. A dominant one? Not even close.

What Current Factories Are Really Producing

Let’s talk about what those factories can actually do.

Most modular factories in operation today are not mega-factories. They’re regional producers, often serving a handful of states, sometimes just one. On average, a typical factory produces 15 to 22 modules per week, with 16.5 modules being a realistic midpoint. Multiply that by our assumed 60 factories, and you get roughly 990 modules per week nationwide.

Since the average single-family modular home requires three modules, that weekly output equates to approximately 330 homes per week, or about 17,000 homes per year at steady production. Even if we’re generous and factor in larger plants and multifamily projects producing the remaining 11,000 living units, the math still lands us near that familiar 3 percent market share.

Modular construction does deliver real advantages—controlled environments, predictable schedules, reduced waste, and improved quality control. But capacity, not capability, is the limiting factor. The industry simply cannot build fast enough to matter at scale—yet.

What 10% Really Means in Factory Terms

Now let’s examine what it would take to reach that often-quoted 10 percent market share.

Ten percent of 1.1 million homes is 110,000 homes annually. To hit that number, existing modular factories would need to ramp production from 330 homes per week to nearly 1,835 homes per week.

That translates into 5,505 modules every single week.

Let that sink in.

Today’s total output—about 990 modules per week—that would need to increase almost six-fold. This isn’t a tweak. This isn’t a productivity improvement. This is a wholesale reinvention of the industry’s physical footprint.

How Many Factories Would That Take?

Using the same realistic production average—16.5 modules per week per factory—the industry would need roughly 334 total factories to support a 10 percent market share. Since we already have around 60, that means adding more than 274 new modular factories.

And these aren’t small facilities tucked behind an industrial park. We’re talking about modern plants with automation, robotics, material handling systems, quality control infrastructure, and trained management teams.

If we assume—conservatively—that a fully equipped, next-generation modular factory costs $25 million, the capital investment required exceeds $6.8 billion.

That’s before land acquisition, workforce development, zoning battles, regulatory delays, or the inevitable learning curves that come with new facilities.

The Real Bottlenecks Nobody Likes to Talk About

Yes, factories should be strategically located near high-demand regions to reduce transportation costs and speed delivery. Yes, automation and BIM-driven workflows can improve efficiency. Yes, workforce training partnerships can help address labor shortages.

But none of those solve the core challenge: scale requires capital, patience, and risk tolerance that this industry has historically avoided.

Factories don’t get built on optimism alone. Investors want predictable demand. Developers want guaranteed capacity. Lenders want proven margins. And factory owners—many of whom are nearing retirement—are often more interested in stability than in betting the farm on expansion.

The Modcoach Reality Check

The potential for modular housing is absolutely real. It can—and should—play a much larger role in solving America’s housing shortage. But the idea that we’ll simply “grow” into a 10 percent market share without confronting the industrial reality is fantasy.

Building 300-plus new factories is not just ambitious—it’s gargantuan.

The future of housing may indeed be modular. But if that future arrives, it won’t come from slogans, pilot projects, or conference applause. It will come from hard decisions, massive investment, and an industry finally willing to think like manufacturers instead of builders.

And that’s the conversation we should be having—before we promise what we’re not yet capable of delivering.

Written by Gary Fleisher, widely known as The Modcoach—industry writer, consultant, and longtime voice of offsite and modular construction.