Standard Specifications and Plans


2020 Standard Plans and Specifications DRAFT - Call for Public Review

The City of Seattle will be publishing a new edition of our Construction Standards (Plans and Specifications) in February of 2020. We are conducting a 60-day public comment period on the proposed 2020 edition of the Construction Standards beginning on October 16th and ending on December 17th, 2019.

The Draft Standard Plans, Specifications, and a comment form are linked below. Please use the Standards Comment Form to document questions, comments, or concerns with the draft documents, and submit them to the City Standards Engineer ( by December 17th, 2019.

2020 Standard Specifications - DRAFT (9 meg pdf) 
2020 Standard Plans (Clean) - DRAFT (17 meg pdf)
2020 Standard Plans (Markup) - DRAFT (10 meg pdf)
COS 2020 Standards Comments Form (xls) 

2017 Standard Specifications for Municipal Construction

Full version of 2017 Standard Specifications (pdf)

To improve functionality, section references in the 2017 Standard Specifications have been cross-referenced (linked) to the corresponding section. To navigate back in the document, press Alt+(left arrow).

2017 Standard Plans for Municipal Construction

Full version of 2017 Standard Plans (pdf)

Redline Markups (pdf) - Revisions to the 2014 edition as published in the 2017 hard copy edition. (Additional recommended revisions to the Standard Plans 2017 edition may be found under the amendments tab.)