Big living, small footprint.
Orange County’s licensed accessory dwelling unit contractor — we design, permit, and build turnkey backyard homes end-to-end. ADUs that add income, space, and value.
We design custom, permit-ready ADUs and build them in months, not years.
Details that earn
their keep.
Every unit is engineered for the way you'll actually live, rent, or work in it — down to the last detail.
Architect-grade design
Licensed architects draw every unit around your lot, light, and privacy.
Permit-ready in weeks
Pre-engineered plans and OC know-how move approvals quickly.
Built fast, built once
Our own crews deliver on a fixed schedule — foundation to finishes.
Finished to move-in
Hand-picked finishes, appliances, and a real front-door key.
Start from a model.
Make it yours.
Four engineered footprints to begin from. Walls move and finishes change — the permit-ready bones stay.
From first call
to front-door key.
One team, one contract, seven clear stages — you always know exactly where your build stands.
Stage 01 / 07
Book a consultation→Consultation
We talk goals, budget, and timeline, then confirm what your property can legally hold.
Site visit
We walk the lot — access, utilities, setbacks, and sun — to ground the design in reality.
Design
Architects develop your plan, elevations and 3D views, refined together until it's right.
Permitting
We package, submit, and clear every city correction — structural, energy, and utilities.
Build
Our crews break ground and deliver on a fixed schedule, with weekly progress updates.
Install & finish
Utilities connected, finishes set, appliances in — every detail brought to move-in ready.
Move in
Final inspection, walkthrough, and keys. Then rent it, host family, or get to work.
Built across
Orange County.
A look inside recent Orange County ADUs we've designed, permitted, and built.
Orange County
and Los Angeles.
As a licensed accessory dwelling unit contractor, L Square designs, permits, and builds custom ADUs, garage conversions, and granny flats across Orange County and Los Angeles.
Explore: ADU Guide · Custom ADU · Garage Conversion · Granny Flat · In-Law Suite · ADU Design-Build · View all areas →
Questions,
answered.
Common questions about building an ADU in Orange County. See all FAQs →
What is an ADU, and why should you build one?
How much does it cost to build an ADU in Los Angeles?
Can you convert a garage into an ADU?
How do you estimate the cost of a home addition?
Do you build ADUs in Los Angeles and Orange County?
What are the benefits of working with an ADU contractor in Los Angeles?
Do you build backyard cottages and cabins in Los Angeles?
More home. Same lot.
Tell us where you are and we'll come back with what's possible on your property — a ballpark, and the next step. No pressure.
Or call (949) 374-7980 · Orange County, CA
