Grading Permit

A grading permit authorizes earthwork on a site — cutting, filling, excavating, or otherwise reshaping the ground — usually before or alongside building construction. Jurisdictions require it because moving earth affects drainage, slope stability, and neighboring properties; uncontrolled grading can cause erosion, flooding, or landslides. The permit lets the building or engineering department review a grading plan and inspect the work to confirm it is done safely.

A grading permit is separate from a building permit, though the two often go together on the same project. Smaller projects on flat lots may move little enough earth to fall under a threshold and avoid a separate grading permit, while projects on sloped sites, those that move large volumes of soil, or those near drainage courses commonly trigger one. Building a detached ADU on a hillside lot, for instance, may require grading to create a level building pad — and that earthwork can be a meaningful cost and schedule item.

Grading review typically looks at cut-and-fill quantities, drainage and stormwater control, retaining walls, erosion control during construction, and how runoff is handled at the property line. On steeper or geologically sensitive sites a soils or geotechnical report may be required as part of the submittal, and the work is inspected at stages much like building work is during plan review and construction.

Whether a grading permit is required, the volume or slope thresholds that trigger it, and the supporting reports needed all vary by jurisdiction and site conditions and can change. This is a general overview, not engineering advice — confirm your project's grading requirements with the local building or engineering department, and engage qualified professionals for sloped or sensitive sites before you start moving earth.