Mission Viejo - ADU Construction

Comprehensive ADU Construction in Mission Viejo

Expanding your property’s footprint requires a strategic, highly coordinated approach. For homeowners, property owners, and real estate developers in Mission Viejo, STG Design Build delivers full-service accessory dwelling unit (ADU) construction. We eliminate the friction of managing multiple independent contractors by bringing architecture, structural and MEP engineering, permitting, and construction entirely under one roof.

An Integrated Design-Build Approach

Executing an ADU build involves navigating strict municipal zoning laws and rigorous structural requirements. Our integrated design-build model provides a single point of accountability from initial concept through final construction. This unified methodology ensures seamless communication between designers and builders, significantly reducing delays, preventing design conflicts, and mitigating costly revisions. Whether you are developing a new rental unit or expanding a primary residence, our in-house team ensures the project is engineered for compliance and executed with absolute precision.

Proven Authority in Southern California Construction

Led by Founder and CEO Rober Khalil, who brings over a decade of design-build expertise to the firm, STG Design Build has established a track record of operational excellence. Over our 7 years in business, we have successfully completed more than 400 projects for over 100 clients across Orange County and Southern California. We operate as a fully licensed, bonded, and insured firm, prioritizing structural integrity, strict safety standards, and professional project management on every site.

Who We Serve

Our ADU construction services are engineered for clients planning significant property additions and ground-up builds that require professional architecture, comprehensive engineering, and full-scale construction management. We focus exclusively on complete, high-quality developments. We do not accept small handyman tasks, maintenance-only repair jobs, or projects driven solely by the lowest price where professional design and engineering are not prioritized.

Take the Next Step

Secure a unified, accountable team for your upcoming development. Schedule a discovery call to discuss your Mission Viejo ADU project and learn how our integrated design-build process protects your timeline and investment.