About us

Sycamore Bldg #22

Based in Southern California, WILLIAM SIMPSON & ASSOCIATES, INC. has served the development and construction community as specialists in the field of structural engineering for more than five decades.  As a leader in this discipline, WILLIAM SIMPSON & ASSOCIATES, INC. has incorporated flexibility and function in the designs of offices, warehouses, shopping centers, research and development facilities, commercial/industrial parks, custom homes, seawalls and marinas.

WILLIAM SIMPSON & ASSOCIATES, INC. is widely recognized for leadership in the design and construction management in special fields such as steel, structures, crane structures, waterfront structures, retaining structures, heavy manufacturing and mining structures as well as erection systems for fabric roof structures used to cover sports stadiums and air terminals. The firm has a proven ability to handle any project requirements both nationally and internationally.

Our History

2461 Bayshore Drive Custom Home 1

In the past five decades, WILLIAM SIMPSON & ASSOCIATES, INC. has been responsible for all phases of design and construction and has a portfolio of completed projects representing over one hundred million square feet.  The firm’s outstanding reputation in the design profession can be noted by its respected list of clients.

Our Locations

William Simpson & Associates, Inc.

Telephone:         (949) 206 9929
FAX:                   (949) 206 9955
Email:                 mail@wsase.com

23 Orchard, Suite 250
Lake Forest, CA 92630