Southern California ADU Design-Build General Contractor
ADUs for your home or multifamily property.
Full design-build by ADU Concepts, permits to final walkthrough, for single-family and multifamily properties across Los Angeles, Ventura, and Orange counties.
Official LyteMods Partner
Authorized Dealer & Certified Installer
Two kinds of projects, one team
Which one is you?
ADU Concepts designs and builds accessory dwelling units for two different kinds of clients. Tell us which one you are, and we'll point you to the right place to start.
For Your HomeI want an ADU for my home.
Backyard ADUs, garage conversions, and JADUs for rental income, multigenerational living, or a place to age in place. We handle design, permitting, and construction, right on your lot.
Most single-family lots can add up to 3 accessory units total: a conversion ADU, a JADU, and a new detached ADU, with no owner-occupancy requirement for the ADUs themselves.
Explore Single-Family ADUs
For Your PropertyI own or manage a multifamily property.
Densification is one of our specialties, not an afterthought: adding detached ADUs to an existing apartment building, plus converting unused interior space like garages, storage rooms, and basements into new units.
Current law lets an existing multifamily property add up to 8 new detached ADUs, capped at your building's existing number of units. A 4-unit building can add up to 4, for example, not automatically 8.
Explore Multifamily & DensificationNot sure which one fits? Tell us about your property and we'll point you in the right direction.
What we do
Everything an ADU project needs, under one roof.
One general contractor carries your project from the first feasibility question through the final inspection.
Density Evaluation
We review your lot, or your building's unit count and zoning, to map out exactly how many ADUs you qualify for and where they can go.
About density evaluation
Design & Permitting
In-house design and a permitting team that manages submittals, corrections, and approvals with your specific city.
About design & permitting
Structural Engineering
Engineering for panelized light-gauge steel and fully custom structures, stamped and ready for plan check.
About structural engineering
Construction Management
Our own crews manage the build on your property from foundation to final inspection, one point of accountability start to finish.
About construction managementThe catalog
Pre-engineered layouts for homes and properties.
Fifteen layouts across single-family, micro, and multifamily, each already engineered by our sister company LyteMods and built on-site by our own crews. Every layout can be adjusted, and we design fully custom ADUs for lots these don't fit.
Single FamilyThe Gem
3 Bed · 2 Bath · 1,245 sq ft
Our most-built single-family layout, 3 beds, 2 baths, 1,245 sq ft.
Single FamilyMultifamilyThe Stack
3 Bed · 2 Bath · 1,200 sq ft
A two-story multifamily ADU building with spacious 3-bed units.
MultifamilyThe Duo
2 Bed · 2 Bath · 860 sq ft
A two-story, two-unit ADU building, two 2-bed homes stacked on one footprint.
Micro Mods
Renderings are illustrative. Sizes, finishes, and room counts can be adjusted to your lot.
Browse All Layouts
What owners say
ADUs people are proud to own.
Real Google reviews from ADU Concepts clients across Los Angeles.
“After meeting with three different contractors in Tarzana and giving each careful thought, I decided to go with ADU Concepts for our ADU project. David was very competitive on price. He really listened to my overall ideas and then worked out a plan that included all the little details I mentioned. I couldn't be happier with how everything turned out!!”
Caroline P.
Tarzana, CA · June 2026
“ADU Concepts built a detached ADU on our Calabasas property and did a fantastic job. They guided us through permitting, construction, and inspections while keeping the project moving smoothly. The finished space looks amazing.”
Michael S.
Calabasas, CA · June 2026
“Highly recommended. The quality of the workmanship was outstanding and the finished results of our ADU exceeded the expectations. David and the team were attentive, organized, and quick to address any questions or concerns we had along the way. Their team was respectful of our home and kept the area clean daily.”
Amber K.
Los Angeles, CA · May 2026
Real projects, on camera
See the work, not just renderings.
A few real ADU Concepts projects, including the story of an ADU that stood through the Eaton Fire while the homes around it burned. More real projects live on our Videos page.
Lytemods & ADU Concepts, Collier Single Family Project
From the feed
Follow along @adu_concepts
Finished ADUs, builds in progress, and projects across Southern California. See what we're building.
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Let's talk about your property.
Whether it's one backyard ADU or a densification plan for an entire building, we'll walk your lot, explain what's possible, and give you a clear next step. No pressure, no obligation.
Would rather speak with someone now? Call 818-962-6900.