HDR Architects

HDR – Henningson, Durham & Richardson, Inc.
350 S. Grand Avenue, Suite 2900,Los Angeles, CA 90071,

3230 El Camino Real, Suite 200, Irvine, CA 92602-1377,

100 Oceangate, Suite 1120, Long Beach, CA 90802-4414,

2280 Market Street, Suite 100, Riverside, CA 92501-2110,

701 E. Santa Clara Street #36, Ventura, CA 93001-5972

401 B Street, Suite 1110, San Diego, CA 92101-4271




We believe that the way we work can add meaning and value to the world. That ideas inspire positive change. That coloring outside the lines can illuminate fresh perspectives. And that small details yield important realizations. Above all, we believe that collaboration is the best way forward.


We specialize in engineering, architecture, environmental and construction services. While we are most well-known for adding beauty and structure to communities through high-performance buildings and smart infrastructure, we provide much more than that. We create an unshakable foundation for progress because our multidisciplinary teams also include scientists, economists, builders, analysts and artists.

Our employees, working in more than 200 locations around the world, push open the doors to what’s possible each and every day.