Orange County, Long Beach, and the greater Southern California region - ADU Construction

Building an Accessory Dwelling Unit (ADU) is a strategic investment for property owners across Orange County, Long Beach, and Southern California. However, navigating local zoning laws, structural engineering requirements, and the construction process itself can quickly become complex. STG Design Build eliminates the friction. We deliver a complete, integrated design-build solution for ADU construction, handling everything from initial architectural concepts to final inspections. Our approach brings architecture, structural and MEP engineering, permitting, and construction under one roof. By acting as a single point of accountability, we reduce delays, prevent design conflicts, and avoid costly revisions. Whether you are a homeowner expanding your living space, a real estate developer maximizing lot potential, or a multifamily property owner adding rental units, our team ensures your ADU is designed and built to exact specifications. Led by Founder and CEO Rober Khalil, our firm has spent 7 years successfully executing over 400 projects for more than 100 clients. We are fully licensed, bonded, and insured, providing a level of professional oversight that piecemeal contractors simply cannot match. We focus exclusively on comprehensive design-build projects requiring professional engineering and full-service construction, ensuring our resources are dedicated to clients who demand quality and seamless execution. Maximize your property’s potential with a unified, expert team. Schedule a discovery call today to discuss your ADU project with our architecture and construction professionals.