Standard Specifications and Plans

2020 Standard Specifications for Municipal Construction

Full version of the 2020 Standard Specifications (pdf) 

To improve functionality, section references in the 2020 Standard Specifications have been cross-referenced (linked) to the corresponding section. To navigate back in the document, press Alt+(left arrow).

2020 Standard Plans for Municipal Construction

Full version of 2020 Standard Plans (pdf)

2020 Amendments

A new set of recommended amendments to the 2020 edition of the Standard Specifications and Standard Plans was posted on 11/03/2021.

Older Amendment Information

Redline Markups (pdf) - Revisions to the 2017 edition as published in the 2020 hard copy edition. (Additional recommended revisions to the Standard Plans 2020 edition may be found under the Amendments section.)

Contact the Standards Engineer

If you have any questions, or if you would like to submit a comment for consideration, please contact the City of Seattle's Construction Standards Engineer at