ModCon plans, coordinates and delivers factory-built housing across the West, and trains the builders who do it with us.
We've set hundreds of modules for ADUs, family homes and workforce housing. Most of what goes wrong on a modular job happens between the factory, the site and the permit desk. That's the part we manage.
*Expanding nationwide in 2027.
“It’s something we’ve been following for a decade. We just hadn’t found the right partner to figure it out with.”
Partner, Northern California general contractor
While modules are built indoors, the foundation and utilities go in on site. We stage, set and stitch as soon as your concrete has cured.
How a project runs, from first site visit to final walkthrough.
We walk the property, talk through the process and set up our pre-construction team.
We work with the planning team and figure out utilities, crane and transportation. If there's a deal breaker, this is the time to find it.
We stay engaged with your team on constructability, logistics and budget management.
Weekly factory inspections, pre-ship QC, route planning and staging.
A distinct way of pouring stem walls that saves time and money. Set crews with world-class safety and efficiency.
Structural stitching, roofing and cladding, plus ownership of every interior finish and tie-in.
“It’s a lot harder than it looks. Modules don’t show up right because someone pushed a button at the factory. Thousands of hours of planning go in before the first unit is built, and there’s still a lot of problem-solving once they hit the ground.”
Joe Halsell
The most common first-time mistake is assuming the factory or the set crew will handle work that isn’t normally in their scope. That gap is where we work.
“Set day feels like the kickoff before the biggest game of the season. A hundred little things and five or six big things you have to get right. You’d think by now I’d sleep well the night before. I don’t.”
Joe Halsell
Two-bedroom ADU · Santa Maria, California. The same lot at three points in the schedule.
Send us your site and find out, before you spend on full plans.
Feasibility comes first: fees, utilities, access, crane and trucking, priced before you commit.
Factories are like builders: each has its own strengths, weaknesses, way of working and expertise. Your site and your product need a specific factory, and we’ve worked with most of them in the West.
Then one team runs the factory schedule, the site work and set day, so you aren't refereeing between them.
Project types: single-family homes, townhomes, condos and apartments, and workforce, affordable and special-population multifamily.
The ModCon Builder Network is a private network of established builders. Membership is by application only.
“It’s something we’ve been following for a decade. We just hadn’t found the right partner to figure it out with.”
Partner, Northern California general contractor
Details are shared with verified applicants only.
The program at a glance
A factory is only as strong as its backlog. We help your projects clear feasibility, bring you projects that play to your factory’s strengths, and, where a buyer doesn’t have one, a builder trained to set your product right the first time.
What we see in the field during QC walks and on set day comes back to your production team.
A factory sells boxes. We make sure each one lands on a site that's ready for it.
*Expanding nationwide in 2027.
Halsell Builders began in the early 1990s as Joe Halsell’s father’s handyman business. Joe joined a few years after college and started his own company in 1999, after moving back to Santa Maria to raise a family. Together they grew from remodeling into commercial and residential design-build.
Small developments followed in 2010. By 2015 the team was building its first small modular projects, and in 2021 it completed its first all-modular development. In 2023 the company began moving its entire operation to factory-built construction, and a year later the shift was complete.
Demand quickly outgrew what one builder could deliver. ModCon was built to share what the team learned with builders, developers and factories across the West.
From the field
“Foundation costs were the single biggest line item left in our site work. We knew we had to do something about it, so we changed everything.”
Joe, walking the foundation of a two-bedroom ADU in Santa Maria before the house arrives.
“Why aren’t there five of these projects in every city in our state? You’ve actually built the perfect project.”
A developer, the first time he saw one of our all-modular projects
The project we’re proudest of is the homeless veteran housing we built in 2021. It was also the hardest. It forced us to zero in on scope gap, the work that falls between the factory, the set crew and the site, and that led to the integrated team we run today.
The work is sacred. Not because it can’t be done anywhere else, but because every man on a job site should know his work has an impact. It’s a roof for a family, tuition at school, a new bat for baseball season, food on the table. And it’s hard, every day. We understand that pressure. We know we’re not defined by our mistakes, and there’s always a second chance for a man willing to make a change.
A few details about your site and your plans, and we'll tell you honestly whether modular fits. A person reads every message and replies within one business day.
2325 Skyway Dr., Suite E
Santa Maria, CA 93455
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