Grading Season Extensions
What Is It?
You need a grading season extension to grade or disturb soil during the rainy season (November 1 to March 31) in a landslide-prone area such as a steep slope, known slide area, or potential slide area. Without an extension, you can only grade from April 1 to October 31.
You also need an extension to grade in the rainy season if we restricted grading when we issued your construction permit. We often limit grading during the rainy season on projects that include a lot of grading even if they are not in a landslide-prone area.
To determine if we restricted grading on your project during the rainy season, look at the special inspection authorization letter that we sent you shortly after we issued your permit. If you see an item called “Monitor Seasonal Grading,” we restricted your project’s grading during the rainy season.
How Much Does It Cost?
When you apply for a grading season extension, you pay for one hour of review time. Before you apply, check your special inspection authorization letter to see if you need a grading season extension because we do not issue refunds.
We review most applications in one hour. If we need more time, we charge you at our hourly rate.
How Long Does It Take?
We try to approve your grading season extension application within two weeks.
Steps to Get an Extension
- Look for “Monitor Seasonal Grading” on your special inspection authorization letter to see if you need to apply for a grading season extension.
- Complete the grading season extension application. You can also apply online. We accept applications for a grading season extension on or after October 1 of each year. Do not submit your application if we haven’t issued your construction permit.
- Your application must include:
- An application form signed by the owner, contractor, and geotechnical engineer
- A site plan showing where grading will occur and measures to control stormwater runoff from the site
- A construction schedule
- A signed letter from the geotechnical engineer of record that:
- Approves the proposed site plan and schedule
- Confirms that there will be no adverse impacts to the environmentally critical area , the site, or neighboring properties from grading during the rainy season
- Recommends how to safely complete the work during the rainy season
- Turn in your application to the Public Resource Center on the 20th Floor of the Seattle Municipal Tower.
- Follow the conditions we set for grading during the rainy season. If we approve your application, we send you a letter with the conditions you need to follow.
- Hold a construction meeting with the owner, contractor, and geotechnical engineer to discuss grading during the rainy season and the conditions we set.