Grading Code

See also: Grading Permit, Grading Season Extensions, Side Sewer CodeStormwater Code2018 Seattle Code Adoption

What Is It?

The Grading Code is in the process of being updated and is scheduled to be effective July of 2021. Check out our Draft Grading Code Update for more information.

Our Grading Code is designed to protect the graded site and adjoining property, preserve natural drainage patterns and watercourses, and control pollution. All grading activity must comply with the code, whether or not it requires a permit or approval from us. The code applies to:

  • Permanent and temporary grading
  • Land-disturbing activities such as replacement of impervious surface (surface that sheds water)
  • Maintenance and protection of grades, slopes, and soil stability

Our code requires that you protect adjoining property, control erosion, and install fencing, boundary designation, and temporary stockpiling during grading activity. The code also specifies when we require permit or approval for grading activity.

Read the Code

Proposed Changes

We are proposing errata amendments for the 2018 Seattle Codes. See our 2018 Seattle Code Adoption web page for more information.