Simi Valley requires grading permits for significant earth-moving activities and enforces drainage standards to prevent erosion, sedimentation, and impacts on neighboring properties. Hillside grading is subject to enhanced review.
A grading permit from the Simi Valley Building Division is required for earth-moving activities exceeding 50 cubic yards of cut or fill. Projects on slopes steeper than 3:1 or within hillside overlay zones require geotechnical reports and enhanced engineering review. All grading must maintain natural drainage patterns and may not direct water onto neighboring properties. Temporary erosion control measures are required during construction and must be maintained through the rainy season (October through April). Retaining walls associated with grading require separate structural permits. The city may require a drainage study for projects that alter surface water flow patterns.
Grading without a permit results in stop-work orders and double permit fees for retroactive approval. Grading that causes erosion, sedimentation, or damage to neighboring properties triggers enforcement action and potential liability. Fines range from $250 to $1,000 per violation.
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Side-by-side rule comparisons with other cities in Ventura County.
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