Irvine's Grading Code (Title 5, Division 10) establishes comprehensive requirements for grading permits, drainage, and site preparation. Grading permits are required for projects that alter terrain or drainage patterns. Plans must demonstrate proper drainage and prevent increased runoff to neighboring properties. The city reviews grading plans for compliance with engineering standards and conducts inspections during construction.
Irvine regulates grading and drainage through building and engineering codes. Grading permits required for excavation or fill over specified thresholds, typically 50 to 100 cubic yards. Site grading must direct drainage away from structures and not adversely affect neighboring properties. Drainage swales, French drains, and catch basins may be required. Retaining walls over 4 feet need engineering and separate permits. Compaction testing required for structural fill. Final grade must match approved plans. Property owners responsible for maintaining drainage facilities on their land.
Unpermitted grading: stop-work order and fines $250 to $2,500. Redirecting drainage to neighbors: corrective action required. Slope failure from improper grading: liability and remediation costs.
Irvine, CA
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Side-by-side rule comparisons with other cities in Orange County.
See how other cities in Orange County handle grading & drainage.
See how Irvine's grading & drainage rules stack up against other locations.
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