Grading activities in Thousand Oaks require permits under TOMC Chapter 7 and must comply with drainage requirements to prevent water from flowing onto neighboring properties. Hillside grading has additional geotechnical and engineering requirements.
TOMC Chapter 7 regulates grading, excavation, and fill activities. Grading permits are required for earth-moving work exceeding specified volume thresholds (typically 50 cubic yards of cut or fill). All grading must include drainage plans that prevent concentrated water flow onto adjacent properties. Hillside properties require geotechnical reports addressing soil stability, landslide risk, and slope analysis. The city's location bordering the Santa Monica Mountains means many properties have significant grade changes requiring engineered solutions. Drainage improvements must connect to the city's storm drain system or provide on-site retention. Grading is generally restricted during the rainy season (October through April) unless adequate erosion control is in place. Post-Woolsey Fire areas may have additional requirements due to altered drainage patterns.
Grading without a permit results in stop-work orders and fines. Illegal grading causing damage to neighboring properties creates civil liability. Violations can carry fines from $250 to $1,000 per day.
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