Terence L. Thornhill, Architect, INC. P.S. is a registered architectural corporation in the State of Washington, established by Katie and Tere Thornhill in 1994 and is located at 4005 Riverhaven St., Pasco, WA 99301.

Tere studied undergraduate Architecture at The University of Washington - School of Architecture in Seattle, Washington and graduate studies at University College Dublin - College of Architecture - in Dublin Ireland.




Prior to establishing the firm of Terence L. Thornhill, Architect, Inc. P.S., Tere practiced architecture in London, England at the City of London Corporation and in Seattle, Washington with TRA Architecture, Engineering, Planning & Interiors and with Mithun Partners Architects and Interiors. It was in Seattle that Tere received awards in both contemporary design and historic preservation/ restoration.

Terence L. Thornhill, Architect enjoys a wide range of experience in both public and private projects including design and master planning of commercial offices, retail facilities, medical laboratories, physician offices, schools, churches, municipal facilities, hospitality facilities, residential remodels, custom and speculative residences, multi-family residences, and much more.



The firm was honored to receive the Mid-Columbia Small Business Association "Small Business of the Year" Gold Award in  1999 for employee relations and client service.


Terence L. Thornhill, Architect, Inc. P.S. prides itself as a design oriented firm specializing in excellence of functionality and aesthetics with a definitive focus on project schedule and the budgetary bottom line.