Retaining Walls: Bellevue vs Seattle
How do retaining walls rules compare between Bellevue, WA and Seattle, WA?
Bellevue and Seattle have similar restriction levels.
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 →Seattle, WA
King County
King County requires a permit for any retaining wall over 4 ft tall or any wall supporting a surcharge load. Walls in landslide or steep-slope critical areas need geotechnical review regardless of height.
View full Seattle rules →Key Facts Comparison
| Fact | Bellevue | Seattle |
|---|---|---|
| - | - | |
| Permit Trigger | - | Over 4 ft (footing to top) |
| Surcharge Rule | - | Permit at any height |
| Geotech | - | Required in slope hazards |
| Critical Areas | - | KCC 21A.24 review |
| Drainage | - | Required by IRC |
Highlighted rows indicate differences between cities.
Bellevue FAQ
Seattle FAQ
How tall can my retaining wall be without a permit in unincorporated King County?
Up to 4 feet from the bottom of the footing to the top of the wall, with no surcharge load. Walls in a mapped landslide or steep-slope hazard area typically need a permit and geotechnical report regardless of height.
Do I need an engineer for my retaining wall?
Yes if the wall is over 4 feet, supports a surcharge, or is located in a landslide, steep-slope, or erosion hazard area. A licensed geotechnical or civil engineer must prepare the report.
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