Climatic and Geographic Design Criteria, Thurston County
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Thurston County Building Codes

Thurston County Climatic and Geographic Design Criteria

Ground Snow Load 20 pounds per square foot
Wind Speed IRC = 85 MPH (miles per hour)
IBC = 110 MPH unless exception in 1609.1.1 applies
ASCE-07-10 = 110 MPH ultimate
Topgraphic Effects No
Seismic Design Category D2 unless information that demonstrates that the site Sds is less than or equal to .83g on the United States Geological Survey Seismic Design Maps.
Weathering Slight to moderate
Frost Depth 12 inches
Termites Slight to moderate
Decay Slight to moderate
Winter Design Temperature 17° Fahrenheit
Ice Shield Required No
Flood Hazard For information about your specific property, contact the Building Development Center. For general information about Special Flood Hazard Areas, click here.
Air Freezing Temperature and Mean Annual Temperature See the Washington State Energy Code.

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Contact Us

Questions can be emailed to staff at the email addresses below. Just click on the e-mail address and send your questions. We would be glad to help answer any question you have about your construction plans.

Commercial plan review and fire code construction inspections: Appointments must be scheduled in advance for Commercial Plan Review. You may schedule by contacting the Commercial Plan Reviewer by email or phone (360) 786-5466. Chris Edmark:

Residential plan review: Available Monday through Friday, 8am – 4:00 p.m. at the Building Development Center. Tim Rubert: Rowland Zoller:

Building inspections and requests for permit extensions: Jay Barney, Senior Bldg Inspector: To request an extension of a building permit, submit a request prior to the expiration of the building permit.  Click here for the building permit extension request form

Fire marshal and fire annual safety inspection: Bobby May:


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