USModular is a second generation, full service, design build general contractor with over 35 years of experience. We specialize in factory built/ prefabricated Accessory Dwelling Units and single family homes. We have an A+ Rating with the Better Business Bureau and we have been featured in Forbes. We are your “One-Stop-Shop” for your detached ADU project in Southern California. We handle everything from design, permits, installation and all site work. Don’t over complicate your ADU project. USModular builds FASTER – BETTER – GREENER and FOR LESS!
Get a Free ADU Site Assessment
Is one of our ADUs right for your property? Enter the complete street address below to find out.
ADUs 160 sq ft to 1,200 sq ft
Park Model RV "Tiny Home" Up to 399 SF
ADU Models 400 SF to 750 SF
ADU Models 751 SF to 950 SF
ADU Model 951 SF to 1,200 SF
Why choose Us?
USModular is Southern California’s premier full service design and build general contractor for the construction of your prefab Accessory Dwelling Unit (“ADU”).
USModular works with several lender partners to assist our clients with funding for their ADU project.
Don’t over complicate your ADU project. USModular builds FASTER – BETTER – GREENER and FOR LESS!
How do we start
We thought you would never ask!
Review the series of floor plans that we offer. Then contact us and provide your project site address and your preferred ADU model
New 2020 California Laws
California is in a housing crisis, both of physical houses and affordability. ADUs help the crisis by getting more homes and lowering cost to build as land and utility infrastructure is already in place (2 of the biggest costs to build a new home). New State of California ADU laws include:
ADUs can be up to 1,200 sq. ft. regardless of the size of primary dwelling unit (as long as you meet setbacks and FAR)
Setbacks reduced to 4’ side and rear yard
Parking requirement for ADU waived
Building with us
The peace of mind is in the details.
Additional Space for family members – grandparents, kids, and relatives
Our clients are not required to use one of our lender partners for financing.
’Prefab’ is shorthand for ‘Previously Fabricated’, meaning it was built in a factory and is reassembled or finished onsite.
We help teams build a business of their dreams with our services.
We work closely with you to understand and identify your business goals that can be converted into an actionable plan.
Bring Ideas to Life
The ideas and plans that we’ve jotted will then be brought to life. We help and guide you to take the first step and set things up.
Setting up a business is not enough. We help you think ahead and encourage you to expand your business with a full-proof plan.
Trusted by Leaders
Customer storiesSee why people love building with us.
“Working with USModular for ADU was easy – they did it all. Love my new ADU!
Dora-Santa Ana CA
“I’m now living next to my daughter and grandkids. Glad the USModular team worked with city to get
permits and build ADU. Watching crane lift my house into backyard was very exciting”
Tamara – Los Angeles CA
Started my ADU just before Covid shutdown – it was a trying time but USModular persevered and got
permits and built me a beautiful ADU”
I have a duplex and was able to permit 2 additional ADUs on my property. No brainer!! I will double my
rental income. Thanks”