We are experts &

provide the best services

Gillis + Panichapan Architects, Inc. (GPa) is a leading full-service architectural, interior design, and planning firm specializing in municipal and public works projects across California. With over 30 years of experience, sustainability is at the core of our practice. Every project, regardless of formal certification, integrates sustainable principles. Our LEED-accredited team prioritizes practical sustainable solutions to enhance environmental performance and long-term viability.

Our mission is to deliver comprehensive architectural services that seamlessly integrate with our clients' objectives, resulting in built environments that not only meet but exceed physical, social, cultural, and aesthetic needs. By combining innovation, expertise, and a deep understanding of our clients' vision, we strive to shape spaces that inspire, enrich, and endure.

FEATURED PROJECT

LEED PLATINUM BUILDING

As a Consultant to Tetra Tech, GPa developed an advanced reclaimed water treatment campus that includes an approximately 45,000sf treatment plant process building and an approx. 24,150sf two story Administration and Visitors Building.