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Transportation & Public Works Construction Projects


The Department of Transportation & Public Works (TPW) administers road construction and other infrastructure improvement projects.

Get project details, work updates, or information about completed projects

Bidding on Projects

For capital projects, bidders need to follow bidding instructions carefully and be sure make all submissions prior to the project's submission deadline.

The County opens all Bids (envelopes or electronic) promptly following the submission deadline and initially evaluates them for responsiveness, and to determine an Apparent Low Bidder. The Sonoma County Director of Transportation & Public Works then reviews the bids and refer them to the Board of Supervisors to consider awarding the project. The review process is complete within 60 days of the bid opening.

Online Bidding

Bidders can obtain Bidding Documents at no charge by registering at Sonoma County's Supplier Portal, the County's online procurement system: 

Register or Log in to Sonoma County's Supplier Portal

Hand Delivered Bids

Although online submission is preferred, Sonoma County will continue to accept hand delivered or mailed Bids.

Contact Information

Transportation & Public Works
Business Hours
Monday – Friday
8:00 AM – 5:00 PM
Contact us by Phone
Office Location
La Plaza B
2300 County Center Drive
Suite B 100
Santa Rosa, CA 95403
38.462006, -122.725384

Supplier Portal

You must be registered in order to review and bid on County business opportunities, or to receive emailed bid alerts and addenda.

Register or Log In

Sonoma County Supplier Portal


Go here to get registered to bid on Sonoma County projects.


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