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How to Do Business With King County

Attend a free, in-person orientation at our office. Learn more about King County's contracting process, effective marketing strategies, and tips for submitting successful bids & proposals.

Chat with our contract specialists, sustainable purchasing manager, and our small business certification team.


Architecture & Engineering




Goods & Services


Video Tutorials


Online Vendor Registration  |  for: Everyone

Want to register for contract opportunities with King County? This series of videos walks you through the process.

Roster Registration  |  for: A/E or Construction firms

Roster projects for Architecture and Engineering (A&E) or Small Works (for construction) projects estimated to be under $300,000 are not advertised; they are available only to roster members. Watch this step-by-step video on how to register for the A&E or Small Works roster.

Click here to watch the video


Level of Effort Training  |  for: Architecture/Engineering firms

This video explains how Architecture/Engineering consultants should submit project-specific costs during negotiations.

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Profit Evaluation  |  for: Architecture/Engineering firms

This video explains how to establish profit margins on architectural and Engineering contracts.

Click here to watch the video

Contact Us

Phone: (206) 263-9400

TTY Relay: 711

Fax: (206) 296-7676