ADU Design-Build

ADU Design-Build in Orange County

Architecture, engineering, permits and construction under one contract — one accountable team from first sketch to final inspection.

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Design-build means one team owns your whole project — design, approvals and the build — so there are no gaps to fall through and no finger-pointing. Here’s why it’s faster, what our process looks like, and what’s included.

Why design-build beats design-bid-build

With one contract you get a single point of accountability. There’s no handoff between a separate architect and builder, the design is drawn to be buildable on budget, and the schedule is fixed up front.

Our process

Five clear stages — consultation, design, permitting, construction and handover — with weekly updates so you always know where your project stands.

What’s included

Architectural drawings, structural engineering, Title-24 energy compliance, the full city submittal, and construction by our own crews — packaged in one contract.

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Why build with L Square

Design, permits and construction under one roof. L Square is a licensed Orange County design-build team (CSLB #1095476). One contract covers architecture, engineering, city approvals and our own build crews — so your ADU moves on a fixed schedule from first drawing to final inspection, across Orange County and Los Angeles.

01 · Architect-grade design: Every unit is drawn around your lot, light and privacy.
02 · Permit-ready, OC-savvy: We know each city’s ADU rules and clear the approvals for you.
03 · Built once, built right: Our own crews deliver on a fixed schedule, foundation to finishes.

Licensed · Insured · Bonded · CSLB #1095476 · Orange County & Los Angeles

Frequently asked questions

What is design-build?

It’s a delivery method where one company handles both the design and the construction under a single contract — instead of you hiring an architect and a builder separately.

How is it faster than hiring an architect separately?

Because design and construction are coordinated from day one, plans are drawn to be buildable on budget, and there’s no gap while you re-bid the project to contractors. One team keeps it moving on a fixed schedule.

Is the price fixed?

We give you a firm, written quote before construction so you’re not exposed to open-ended costs. Any change is agreed in writing before it happens.

Who pulls the permits?

We do. We package, submit and clear every city correction — structural, energy and utilities — so you don’t have to deal with the planning department.

What’s not included?

Items like surveys, soils reports or off-site utility work can be project-specific; we flag anything outside the base scope clearly in your quote so there are no surprises.

Building an ADU in your Orange County city

ADU rules vary by city — we handle the specifics for your address. Statewide, California allows ADUs up to about 1,200 sq ft with 4-ft side and rear setbacks (CA HCD); your city may add its own details. For the statewide rules, see the CA HCD ADU Handbook.

Irvine ADU rules Anaheim ADU rules Santa Ana ADU rules Huntington Beach ADU rules ADU cost guide All areas we serve

Ready to start
your ADU?

Get a free, no-pressure quote from a licensed Orange County design-build team — and a plan drawn around your lot.