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Development Services

From Concept to Construction

Phone: 503-823-7300

TTY : 503-823-6868

1900 SW 4th Ave, Portland, OR 97201

Retaining Walls

Information relating to walls that support dirt fill.

Table of Contents

(Printable Version)

Getting Started

A building permit is required when constructing a retaining wall that:

  • is more than four (4) feet high, measured from the bottom of the footing to the top of the wall.
  • supports a surcharge. A surcharge is an additional load, beyond the normal weight of a level earth backfill is to holding back.

A zoning permit or a site development permit may be required instead of a building permit. Visit or call the Planning and Zoning staff (503) 823-7526 and Site Development staff (503) 823-7310 at the Development Services Center to determine if these permits are required.

 

Your permit will be reviewed under provisions in the Residential Specialty Code (formerly the One and Two Family Dwelling Specialty Code) based on the 2003 IRC. View more information on building codes.


Applying For My Permit

The following information must be submitted when applying for a permit to construct a retaining wall. Since every project is unique, there may be some situations where you will be asked to provide additional information.

  • Completed building permit application
  • An engineer registered in the State of Oregon provides stamped drawings and calculations for wall(s) over four feet tall
Site Plan (Scale site plans to most appropriate scale, e.g. 1”=10’ or 1/4”=1’)
  • Property lines, with dimensions
  • Adjacent streets and any easements
  • Property address and R number
  • North arrow
  • Distance between buildings and between buildings and property lines
  • Dimensions and area (in square feet) of any proposed paving. (If your project will add more than 500 square feet of impervious area you will need to provide a mitigation form and/or a stormwater plan)
  • Dimensions and placement of the new retaining wall on the lot
To submit for a permit, bring the completed building permit application and four (4) copies of site, architectural and structural plans (for the area of proposed work and areas affected by such work ) along with intake fees to the Development Services Center.

If you are hiring sub-contractors to do work on your project, and know who they are when applying, they will be listed on your permit at that time. If you don't know when you apply for your permit, they can be added after issuance. Sub-contractors you hire must be registered with the State of Oregon and carry a current CCB license.
 
THINGS TO CONSIDER:
(1) Engineering Evaluations
Design of retaining walls over four feet tall shall include a site sketch consistent with the site plan submitted with the application. In lieu of a site sketch in the calculation package, the engineer may submit a letter stating that the calculations were prepared for the site as shown on the submitted site plan prepared by others.

Where the retaining wall influences the loads on a building, the engineering evaluation shall also address the effect of the loads imposed onto the building. In all cases, and especially where tiered retaining walls are proposed, the analysis shall include complete free-body diagrams of the retaining walls showing all loads acting on the retaining wall system and all loads used to resist the applied forces. The calculations shall clearly state all assumptions and list the soil design parameters used in the design.
 
(2) Site Development and Environmental Soils
Depending upon the placement of the building or structure, the following items must be addressed in evaluation and analysis of the design:
  • Slope and retaining wall drainage
  • Erosion control
  • Potential for shallow failures
  • Potential soil creep
  • Potential settlement
  • Effect of surcharge loads such as new building and/or structure footings
  • Protection of adjacent property and existing building during construction
For more information call Site Development and Environmental Soils (503) 823-6892 staff.
 
(3) Right-of-Way Requirements
If your project requires construction in the public right-of-way, the Portland Department of Transportation will review the project, and issue a separate transportation permit for this work as well. For more information about right-of-way requirements, contact the Portland Department of Transportation at (503) 823-7002.

Make sure that the design of your retaining wall does not result in a section of the foundation or specifically the “toe” (the outside points of each leg of a structural angle) needing to be placed off of your property.
 
(4) Special Inspections
Soils special inspections and/or structural special inspections may be required prior or during the construction of your retaining wall.

Soils special inspections may be required for work that includes foundation work of a more complicated nature such as piling, or foundations on steep slopes or large jobs; and retaining walls, landslide slope remediation work or other earthwork-related work. Soils special inspection is performed by the geotechnical engineer of record and/or an approved testing agency and is hired for this purpose by the (permit holder) property owner. View more information on special inspections.
 

Plan Review Process

After you pay intake fees, your project will be "under review". The bureaus/review groups that will check a typical retaining wall project are:

  • Planning and Zoning Review
  • Life Safety Review
  • Structural Review
  • Site Development Review
  • Bureau of Environmental Services
  • Transportation
Overview of the permitting process
 
Checksheets
A checksheet is sent to the applicant when a reviewer needs additional information or a correction has to be made to the plans. When you have gathered the additional information or made the corrections, bring the plans/information to the Development Services Center. Reviewers will be notified that a checksheet response has been received and the review will continue.

For more information on checksheets.
 
Status Reports
Status reports are available after your project has been assigned to reviewers. Status reports show all reviews and include the reviewer’s name and phone number. To obtain a status report, call (503) 823-7000 and select option four (4) to have a status report faxed to you or call (503) 823-7357 to have one mailed to you.
 
Permit Issued
When the last technical review is approved, your permit will pre-issued. You will be contacted when your permit is ready, and of your final fee total. Fees may be paid by cash, check, Visa or Mastercard.
 
If your permit is ready for issuance, you may pick up your permit between 8:00 am - 3:00 pm, Monday-Friday at Permitting Services, located on the 2nd floor of 1900 SW 4th Avenue, Portland, OR. For more information call (503) 823-7357. 

Inspections

The yellow or blue (site development) inspection card lists all the inspections you will likely need during your construction project, and what work needs to be done first. 


Applications & Handouts

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