Retaining Wall Permit Requirements in Forest Grove, OR
City runs its own delegated building program (Forest Grove/Cornelius Building Division) and issues structural, mechanical, and plumbing permits enforcing the statewide Oregon specialty codes; permits pulled through the State of Oregon ePermitting (Accela) portal. Verified exemption thresholds: deck exempt if not over 30 in above grade and 5 ft from property lines; fence exempt if not over 6 ft (pool barriers regulated); accessory building exempt if not over 200 sq ft (or frame-covered up to 500 sq ft, one story, 5 ft from lines); reroof exempt if not over 30% of live-load capacity and not required to be fire-resistant. Office hours not published online.
By Joey, Founder · Last verified May 31, 2026 · How we research →
When you don’t need a Retaining Wall permit
A retaining wall not over 4 feet high measured from the bottom of the footing to the top of the wall, and not supporting a surcharge, is exempt from a building permit under the 2023 Oregon Residential Specialty Code as enforced by the City of Forest Grove Building Division. A taller wall, or any wall supporting a slope, driveway, or other surcharge, requires a permit and an engineered design. Drainage behind the wall is the owner's responsibility.
Retaining Wall Permit Costs: Forest Grove vs. Nearby
| City | Estimated Fee |
|---|---|
| Forest Grove | N/A |
| Portland | $150 – $600 |
| Lane County | $90 – $450 |
| Salem | $150 – $600 |
Fees shown are estimates based on local building code data. Actual fees may vary based on project scope and valuation. See all Forest Grove permit costs →
Zoning Considerations
Retaining walls near property lines may require zoning setback review. Walls that significantly change the grade of a property may need additional zoning approval.
Estimated Project Timeline
Here's a typical timeline for a retaining wall project:
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Frequently Asked Questions
Contact the building department for current Retaining Wall permit fee information. Fees typically vary based on project scope and valuation.
It depends on the specifics of your project. Some smaller Retaining Wall projects may be exempt from permit requirements, while larger ones typically require a permit. Use our free lookup tool to check your specific situation.
Working without a required permit can result in fines, stop-work orders, being required to remove completed work, and complications when selling your home. It's always best to check first.
Contact the building department for current processing times. Timelines vary based on project complexity and whether plan review is required.
Learn More About Retaining Wall Permits
Read our complete guide covering permit requirements, costs, common exemptions, and the application process.
Read Retaining Wall Guide →