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.
Grading, excavation, and fill work in Redmond is regulated under Redmond Municipal Code Title 15 and the International Building Code Appendix J as adopted under RCW 19.27. A grading permit is generally required when a project exceeds 50 cubic yards of cut or fill, when any work occurs on a slope over 15 percent, or when grading occurs within a designated critical area (steep slopes, wetlands, streams, the Bear Creek or Sammamish River buffers). Drainage review must demonstrate that new or modified grading will not divert runoff onto neighboring properties and must comply with the DOE 2019 Stormwater Management Manual for Western Washington. Retaining walls over 4 feet in exposed height, measured from the bottom of the footing, require engineering and a building permit. Projects over 1 acre of disturbance also need coverage under the state Construction Stormwater General Permit. Temporary erosion and sediment control are required throughout all grading operations.
Contact your local code enforcement office for specific penalty information.
Redmond, WA
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Redmond, WA
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Redmond, WA
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Redmond, WA
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Side-by-side rule comparisons with other cities in King County.
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