Building Services

Andy Back; Planning and Development Services Manager

Welcome to Washington County Building Services. We are a full-service building permit office providing permitting, plan review and inspections for all phases of construction on commercial and residential properties in unincorporated Washington County and inside the city limits of Banks, Gaston and North Plains.

In addition, we provide electrical permitting, plan review and inspections for the cities of Cornelius, Durham, Forest Grove, Sherwood and Tualatin. 


Unsure in which jurisdiction your property resides?

To learn in which jurisdiction your home or business is located, input your address into the Oregon E-Permitting website. If your property is located in another jurisdiction, contact that building department to get answers to the questions you need. You can also find a listing of building departments throughout the State of Oregon on the website.

Additions? Garage conversions? New decks, sheds or fences?

Any changes to or on your existing property, such as additions, garage conversions, decks, sheds and fences, need to be approved through the Current Planning and Development Assistance section. In person assistance is available Monday through Thursday 8:00 a.m. - 4:00 p.m. during walk-in lobby hours. Phone assistance 503-846-3470 is available Monday through Friday 8:00 a.m. - 5:00 p.m. You can also e-mail your questions to


Considering a voluntary seismic upgrade for your existing home?

Many homes built before the 1980s were built using older construction techniques that are inadequate for the forces we now know earthquakes can cause. You can find more information at our Seismic Strengthening website.


Building Services Office Location and Hours

Washington County Public Services Building
Land Use & Transportation Department
Planning and Development Services, Building Services Section
155 N 1st Avenue, Suite 350
Hillsboro, Oregon

Walk-in Customer Lobby Hours: Monday - Thursday 8:00 a.m. - 4:00 p.m.

Customer Phone Hours: Monday - Friday 8:00 a.m. - 5:00 p.m.