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Tips for Success

View Upcoming Capital Projects to learn more about anticipated contracting opportunities with King County.

Advertisements are published in the Seattle TimesDaily Journal of Commerce, and our website.

Tip:  Register as a vendor and sign up for our automatic email notifications.


King County uses rosters for projects less than $300,000.  Roster projects are unadvertised; only roster members are invited to submit bids for roster projects. Because of their limited scope, roster projects are ideal for small firms.

Visit the Rosters page and begin the application process.

Attend a pre-bid meeting for advertised contracts. View the Attendees List posted to the Solicitation Details page on the Online Vendor Registration (OVR) portal.

Or, visit the Online Vendor Registration (OVR) portal and view the Planholders list to see who's planning to submit a bid.

Small Contractor and Supplier (SCS) certification is like a gold star next to your name, making  you eligible for special consideration by King County agencies and our partners (Sound Transit, Port of Seattle, and Seattle Colleges). 

Visit the SCS Certification page to learn who's eligible.

Visit the SCS Directory to search by category, NAICS, CSI, name or description.

Small Works Roster

Roster projects are not advertised; only roster members can bid. 

King County uses rosters for smaller projects (less than $300,000). 

Apply for roster membership

Contact Us

Phone: (206) 263-9400

TTY Relay: 711

Fax: (206) 296-7676