Central West Headquarters Re-Roof

Location:	Washington
Posted:	Aug 25, 2026
Due:	Sep 2, 2026
Agency:	City of Seattle
Type of Government:	State & Local
Category:	Y - Construction of Structures and Facilities
Solicitation No:	PW#2025-028
Publication URL:	To access bid details, please log in.

Project ID: PW#2025-028

Title: Central West Headquarters Re-Roof

Addenda: 4

Release Date: 7/29/2026

Due Date: 9/2/2026

Last updated by Addendum #4 on Aug 25, 2026 12:19 AM

Public Works

Project ID: PW#2025-028

Release Date: Wednesday, July 29, 2026

· Due Date: Wednesday, September 2, 2026 2:00pm

Posted Wednesday, July 29, 2026 6:00am

All dates & times in Pacific Time - Los Angeles

Draft Response No Bid7 days, 19 hours, 44 minutes

Post Information

Posted At:Wed, Jul 29, 2026 6:00 AM
Sealed Bid Process:Yes (Bids Sealed / Pricing Sealed)
Private Bid:No

Overview

Summary

Project Description: RE-ROOF - REMOVE AND DISPOSE OF THE EXISTING BUILT-UP ROOF MEMBRANE DOWN TO THE EXISTING T&G WOOD DECKING AT HIGH ROOF AND BARREL VAULT. REMOVE AND DISPOSE OF BUILT-UP ROOF TO PLYWOOD DECK AT LOW ROOF. REMOVE AND DISPOSE OF CORRUGATED METAL SIDING AT GABLE ENDS OF VAULTED ROOF. INSTALL TAPERED POLYISOCYANURATE INSULATION, AND COVERBOARD. MECHANICALLY FASTEN THE FIRST LAYER OF INSULATION AND FULLY ADHERE THE SUBSEQUENT LAYERS. INSTALL NEW EPDM ROOF MEMBRANE AT FLAT ROOFS. INSTALL STANDING SEAM METAL ROOF AT VAULTED ROOF AND UNDERLAYMENT. RAISE PARAPET HEIGHT TO ACCOMMODATE NEW TAPERED INSULATION. INSTALL NEW SHEET METAL FLASHINGS AND PARAPET COPING. INSTALL SAFETY RAILS. INSTALL LADDERS.

BID ADDITIVE NO. 1: STRUCTURAL UPGRADES. INSTALL 5/8" PLYWOOD ROOF DIAPHRAGM.

Engineer's Estimate: $581,072.00 Additive #1: $137,616.00

Project Location: 1403 W Howe St Seattle WA 98119

Timeline

Release Project Date:

July 29, 2026

Pre-Bid Site Meeting #1 (Mandatory for Bidders to attend at least 1 of the 3 Pre-Bid Meetings):

August 5, 2026, 11:00am

Pre-Bid Site Meeting #2 (Mandatory for Bidders to attend at least 1 of the 3 Pre-Bid Meetings):

August 6, 2026, 1:00pm

Question Submission Deadline:

August 11, 2026, 5:00pm

Pre-Bid Site Meeting # (Mandatory for Bidders to attend at least 1 of the 3 Pre-Bid Meetings):

August 27, 2026, 11:30am

1403 W Howe St Seattle WA 98119

Bid Open Date:

September 2, 2026, 2:00pm

Central West Headquarters Re-Roof

See also