Retaining Walls: Auburn vs Bellevue
How do retaining walls rules compare between Auburn, WA and Bellevue, WA?
Auburn has fewer restrictions than Bellevue.
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 →Bellevue, WA
King County
Bellevue requires building permits for retaining walls over 4 feet measured from bottom of footing; walls in critical areas need geotechnical review regardless of height.
View full Bellevue rules →Key Facts Comparison
| Fact | Auburn | Bellevue |
|---|---|---|
| Permit Trigger | Over 4 feet | - |
| Engineering | Required over 4 ft | - |
| Critical Areas | Lea Hill, Lakeland steep slopes | - |
| Code | IRC R105.2 / ACC 16.10 | - |
| - | - |
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.
Bellevue FAQ
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