Grading & Drainage: Kent vs Redmond
How do grading & drainage rules compare between Kent, WA and Redmond, WA?
Redmond has fewer restrictions than Kent.
Kent, WA
King County
Kent requires a grading permit for most cut or fill over 50 cubic yards under KCC Title 14. Drainage changes must match the DOE Western Washington Stormwater Manual and not harm neighbors.
View full Kent rules →Redmond, WA
King County
Redmond requires a grading permit for earthwork over 50 cubic yards or grading in critical areas under RMC Title 15, with drainage review by Public Works based on the DOE Stormwater Manual.
View full Redmond rules →Key Facts Comparison
| Fact | Kent | Redmond |
|---|---|---|
| Permit trigger | 50 cy cut or fill | 50 cubic yards cut or fill |
| Disturbance | 7,000 sf | - |
| Steep slopes | Geotech at >15% | - |
| Retaining walls | Permit over 4 ft | - |
| Critical area | - | Any grading needs review |
| Wall engineering | - | Over 4 ft exposed |
| Drainage | - | DOE manual standards |
Highlighted rows indicate differences between cities.
Kent FAQ
Do I need a permit to regrade my Kent yard?
Yes if you move more than 50 cubic yards, disturb over 7,000 sf, or change drainage affecting a neighbor.
Can I add fill in a floodplain?
Fill in the Green River floodway is prohibited; in the flood fringe it requires permits and compensating storage in many cases.
Redmond FAQ
Do I need a permit to regrade my Redmond yard?
Yes if cut or fill exceeds 50 cubic yards, if it is on a steep slope, or if it is inside a critical area like a stream buffer.
Can I divert drainage onto my neighbor's lot?
No, Redmond requires grading designs that keep runoff on the originating property or into an approved drainage system.
Compare other topics
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