We are experts that want to

provide you with the best service possible

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. We want to create connections and make a difference by enhancing the places people work and visit. By combining innovation, expertise, and a deep understanding of our clients' vision, we strive to shape spaces that endure, enrich, and inspire.

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.