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’)|
|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:
|(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.