Retaining Walls: Auburn vs Kirkland
How do retaining walls rules compare between Auburn, WA and Kirkland, WA?
Auburn has fewer restrictions than Kirkland.
Auburn, WA
King County
Retaining walls over 4 feet from footing to top require a building permit and engineering in Auburn under IRC R105.2. Walls near Lea Hill and Lakeland steep slopes face critical area review.
View full Auburn rules →Kirkland, WA
King County
Kirkland requires building permits for retaining walls over 4 feet or any wall with a surcharge. Walls on Finn Hill, Juanita, and Lakeview steep slopes need geotechnical review regardless of height.
View full Kirkland rules →Key Facts Comparison
| Fact | Auburn | Kirkland |
|---|---|---|
| Permit Trigger | Over 4 feet | Over 4 ft or surcharged |
| Engineering | Required over 4 ft | - |
| Critical Areas | Lea Hill, Lakeland steep slopes | Geotech required |
| Code | IRC R105.2 / ACC 16.10 | - |
| Rockeries | - | Same rules as walls |
| Drainage | - | Must go to stormwater |
Highlighted rows indicate differences between cities.
Auburn FAQ
Do I need a permit for a 3 foot retaining wall in Auburn?
Generally no, unless it supports a surcharge or sits in a critical area. Walls 4 feet or less that do not support fill above are permit-exempt under IRC R105.2.
Is engineering required for retaining walls in Auburn?
Yes, for any wall over 4 feet and for walls in steep-slope critical areas, engineered design stamped by a licensed Washington engineer is required.
Kirkland FAQ
When do I need a permit for a retaining wall in Kirkland?
Any wall over 4 feet from footing base, any wall supporting a surcharge, or any wall in a critical area such as a steep slope or wetland requires a permit and often a geotechnical report.
Are rockeries treated like retaining walls?
Yes. Rockeries over 4 feet require permits and engineered designs under the Washington State Building Code as adopted by Kirkland.
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