Seattle City Hall Plaza Waterproofing Replacement

Project Description: The work includes the removal and replacement of the existing waterproofing membrane, associated paving, and landscaping elements at the elevated plaza. Energy upgrades are not included in this bid. The project will be delivered in three (3) construction phases occurring over calendar years 2026-2027 to maintain site functionality and manage operational impacts. The work also includes the installation of one (1) new flagpole on the elevated plaza

Upon completion of all construction activities, the plaza shall be fully restored to its original appearance.

Engineer's Estimate: $6,864,865.00

Project Location: Seattle City Hall 600 4th Ave, Seattle, WA 98104

Background

This Project is a Covered Project subject to the City of Seattle’s Community Workforce Agreement (CWA) and Priority Hire SMC 20.37.  With the support of the mayor and City Council, the City of Seattle administers programs that support racial and economic equity through contracting. Priority Hire is one of these programs. Priority Hire provides people living in economically distressed communities, women, and people of color access to work on the city’s construction projects. It gives contractors access to these skilled workers

Project Details

• Reference ID: PW#2025-029
• Department: Public Works
• Department Head: Mark Nakagawara (Deputy Division Director)

Important Dates

• Pre-Proposal Meeting: 2026-03-26T18:00:00.000Z — This is a MANDATORY pre-bid site inspection/walk for this project. All those that wish to bid on the project will need to attend one site walk. Please meet at Seattle City Hall located at 600 4th Ave, Seattle, WA 98104. Please meet on the west side at the top of the grand stairway in the main lobby facing 5th Avenue. Please note that parking may be limited and will most likely require payment. If more than one person from the same entity is attending, we encourage carpooling where possible.

Meetings & Milestones

Addenda

• Official Notice #1: Pre-Bid Walk Attendance List (released 2026-04-01T01:19:07.831Z)
• Addendum #1 (released 2026-04-01T02:38:30.126Z) —

  Please use the See What Changed link to view all the changes made by this addendum.

  Please Note: This addendum includes changes to the Question Deadline and Bid Opening.

• Addendum #2 (released 2026-04-09T14:08:09.785Z) —

  This addendum addresses (1) Q&A

Evaluation Criteria

• Summary —

  Project Description: The work includes the removal and replacement of the existing waterproofing membrane, associated paving, and landscaping elements at the elevated plaza. Energy upgrades are not included in this bid. The project will be delivered in three (3) construction phases occurring over calendar years 2026-2027 to maintain site functionality and manage operational impacts. The work also includes the installation of one (1) new flagpole on the elevated plaza

  Upon completion of all construction activities, the plaza shall be fully restored to its original appearance.

  Engineer's Estimate: $6,864,865.00

  Project Location: Seattle City Hall 600 4th Ave, Seattle, WA 98104

• Important Instructions for Electronic Submittals —

  The City of Seattle is accepting electronic bid submissions. Bidders shall create a FREE account with OpenGov Procurement by signing up at https://procurement.opengov.com/signup. Once you have completed account registration, browse back to this page, click on "Draft Response", and follow the instructions to submit the electronic bid.

• Timeline —

  Release Project Date:	March 20, 2026
  1st Pre-Bid Meeting (Bidder must attend one of the two mandatory Pre-Bid Meeting) (Mandatory):	March 26, 2026, 11:00am This is a MANDATORY pre-bid site inspection/walk for this project. All those that wish to bid on the project will need to attend one site walk. Please meet at Seattle City Hall located at 600 4th Ave, Seattle, WA 98104. Please meet on the west side at the top of the grand stairway in the main lobby facing 5th Avenue. Please note that parking may be limited and will most likely require payment. If more than one person from the same entity is attending, we encourage carpooling where possible.
  2nd Pre-Bid Meeting (Bidder must attend one of the two mandatory Pre-Bid Meeting) (Mandatory):	March 31, 2026, 11:00am This is a MANDATORY pre-bid site inspection/walk for this project. All those that wish to bid on the project will need to attend one site walk. Please meet at Seattle City Hall located at 600 4th Ave, Seattle, WA 98104. Please meet on the west side at the top of the grand stairway in the main lobby facing 5th Avenue. Please note that parking may be limited and will most likely require payment. If more than one person from the same entity is attending, we encourage carpooling where possible.
  Question Submission Deadline:	April 23, 2026, 5:00pm
  Bid Open Date:	April 29, 2026, 2:00pm

• Scope of Work or Project Details —

  Please see the Attachments section for specifications and attachments.

• Project Contact —

  Paul Spivey

  Strategic Advisor II

  700 5th Ave

  Seattle, WA 98101

  Email: paul.spivey@seattle.gov

  Phone: (206) 496-9915

• Procurement Contact —

  Pamela Honma

  Sr. Construction Contracts Specialists

  700 5th Ave

  Seattle, WA 98101

  Email: pamela.honma@seattle.gov

  Phone: (206) 733-9941

Submission Requirements

• Proposal Submittal (required) —

  Please upload your complete proposal response excluding pricing.

  • Bidder is responsible for integrity of the file to be uploaded
  • Verification of uploaded file integrity can be confirmed by clicking on the upload file.
• Bid Forms (required) —

  Please upload a PDF of the forms provided by the Owner that must be submitted with the Bid.

  Please upload a SINGLE PDF.

  • Bidder is responsible for integrity of the file to be uploaded
  • Verification of uploaded file integrity can be confirmed by clicking on the upload file.
• Bid Guarantee (required) —

  Please upload an electronic scan of your Bid Bond or Cashier's Check. 

  • Bidder is responsible for integrity of the file to be uploaded
  • Verification of uploaded file integrity can be confirmed by clicking on the upload file.
• Will this solicitation be awarded based on Evaluation Criteria/Committee? (required)