Link to Transportation Home Page Link to Transportation Home Page Link to Transportation About Us Page Link to Transportation Contact Us Page
Delivering a first-rate transportation system for Seattle Scott Kubly, Director







Site Index

Street Use Home
Getting a Permit
Pay Permit Fees or Check Status
Fees Information
Permit Services Online Help
Access Seattle: Hub Coordination
Newsstand Reporting
Construction Use & Simple Utility Permits
Public Space Permits
Major Improvements Permits
Urban Forestry Permits
Applications, Forms & Templates
TCP Base Map Tool
Codes & Rules
Client Assistance Memos
Street Vacations
Shoring Review
Resolving Permit Disputes
Frequently Asked Questions
Contact Street Use

Street Use Shoring Review

Shoring Wall

Shoring is a means of supporting the earth in a trench or vertical cut for construction or other activity. There are many types of shoring techniques for earth reinforcement or support. The picture above shows a vertical cut wall using soldier piles, shotcrete and tiebacks. Properly installed shoring is critical for maintaining the structural integrity of the adjacent roadway and underground utility infrastructure.

Shoring review is conducted by the Seattle Department of Construction and Inspections (Seattle DCI). In the interest of making things easier for individuals seeking a permit, Seattle DCI and SDOT collaborate on the shoring review process to allow for one-stop permitting.

Shoring review is initiated at Seattle DCI. At the point of intake, the intake reviewer assigns all necessary review locations for a particular project. Street Use shoring review is initiated for any proposed excavation that would be greater than three feet deep immediately adjacent to any given public right of way. Shoring review would also occur for any proposed excavation within an imaginary 1H:1V slope (a one-foot horizontal to one-foot vertical relationship, or a 45-degree line). This point is taken from the existing grade at the public/private property line and then descends down to within private property. (Please refer to Figure 1 below for clarity). Once a shoring installation is designated as a review location, a plan is routed to Street Use for review. Seattle DCI will not issue a building permit until shoring is approved in the review location.

Area of Shoring Review
Figure 1

The shoring components may include cantilever soldier piles, soldier piles and tiebacks, soil nail walls, slope cuts or a combination of the aforementioned. The system that would be approved depends on site specific constraints and public need considerations. Our shoring reviewers always encourage and welcome pre-design meetings. To better facilitate the review process, a direct submittal to the shoring reviewer would be beneficial. The direct submittal shall include the following:

  1. Soils report
  2. Shoring plan
  3. Building foundation plan
  4. Site survey

The City of Seattle allows for components of the temporary shoring system to be placed in the public right of way. The City will allow temporary anchorage such as soil nails and tiebacks to be installed in the public right of way under an indemnity agreement. The soldier piles may be placed in the public right of way as long as they are temporary in function and the permanent building does not rely on their presence. The augur hole may extend 24" into the right of way and the steel soldier pile component, 21". (Please refer to Figure 2 below for clarity). Prior to the end of the project, the components of the temporary shoring system that are located in the public right of way will need to be removed as follows:

Tiebacks must be detensioned.

Soldier piles, lagging and any concrete encasement must be cut and removed to a point that is 4 feet below grade.

Shoring in Right of Way
Figure 2

Typically a designer would size the tiebacks and soil nails to be fully contained within the width of any given public right of way. If the tiebacks or soil nails extend pass the public right of way and underneath a private property, an easement from the private property owner(s) is required prior to shoring sign off.

Home | About Us | Contact Us | Site Index | News | FAQs | E-Mail Alerts