Orange - ADU Construction

Property owners, real estate developers, and homeowners in Orange require a streamlined, highly professional approach to accessory dwelling unit (ADU) development. STG Design Build delivers exactly that. As a full-service design-build firm, we integrate architecture, structural and MEP engineering, city permitting, and ground-up construction into a single, accountable process.

The Integrated Design-Build Advantage

Building an ADU involves navigating complex zoning laws, strict engineering requirements, and detailed permitting processes. By keeping every phase of your ADU construction under one roof, STG Design Build eliminates the communication gaps that often occur between independent architects, engineers, and general contractors. Our integrated method reduces project delays, prevents costly design revisions, and ensures your build moves efficiently from initial concept through final construction.

Proven Expertise in Southern California

Led by Founder & CEO Rober Khalil, who brings over 10 years of design-build experience, our team is built on a foundation of professional execution. Over the past seven years in business, STG Design Build has successfully completed over 400 projects for more than 100 clients. We are fully licensed, bonded, and insured, providing secure and authoritative oversight for your investment.

Is Our ADU Construction Service Right for You?

We specialize in significant, comprehensive ADU construction projects that require professional design, rigorous engineering, permitting, and full-service execution. We partner with clients who value single-source accountability and high-level project management. Our firm is not a fit for minor maintenance tasks, small handyman repairs, or projects awarded solely on the lowest bid where structural engineering and architectural oversight are not required.

Start Your Orange ADU Project

Take the complexity out of property expansion. Partner with a firm that handles your architecture, engineering, and construction under one roof. Schedule a discovery call with our team to discuss your ADU project in Orange today.