What Is a Grading Plan?

The core of a grading plan is its contours. Existing contours show the ground as surveyed, and proposed contours show the ground after construction. Where a proposed contour meets an existing one, the plan marks the limit of grading, often called the daylight line. Spot elevations at pads, corners, drains, curbs, and wall tops give the contractor numbers where contours would be ambiguous.

Other items sit on the same sheet. Slope ratios and benches on cut and fill banks, drainage flowlines, swales, inlets, and pipes show where water goes. Retaining walls have top and bottom elevations. Property lines, easements, setbacks, and existing utilities and structures give the context, along with the scale, north arrow, legend, and general notes.

Grading is mostly about water. The plan should show every lot or pad draining away from structures, to a defined outlet, without sending runoff onto a neighbor. Reviewers check the slope away from buildings, the outlet for each drainage area, and whether runoff from offsite crosses the property.

A grading plan that moves earth correctly but leaves a low spot against a foundation is the usual source of a correction. The fix is a spot elevation and a flowline, and the time to catch it is at plan review rather than after the pad is graded.

Many jurisdictions ask for the volume of cut, fill, import, and export, commonly in cubic yards, along with remedial earthwork called for by the geotechnical report. The numbers matter beyond the permit. They drive the earthwork bid and the number of truck trips, and a plan that is out of balance means soil must be hauled on or off the site.

The quantities come from comparing the existing and proposed surfaces. When the grading plan changes during design, the earthwork quantities need to change with it, and mismatches between the plan and the estimate are a common pricing dispute.

A rough grading plan covers the bulk earthwork that shapes the site: pads, slopes, and major drainage. It usually comes first and supports the grading permit. A precise or finish grading plan sets the final elevations for paving, walks, and landscape after the site is roughed in.

Some jurisdictions require both, with different checklists and sign-offs. The project should know which one the permit calls for, because an incomplete plan is returned as a correction and holds up the start of work.

Reviewers use a published checklist. Typical items include scale and legend, existing and proposed contours, spot elevations, slopes within allowed limits, drainage paths and outlets, retaining wall details, quantities, and the engineer’s stamp. Each jurisdiction names its own requirements, so the checklist for the permit counter beats a general template.

Because the plan relates to the site plan, the geotechnical report, the drainage calculations, and the architectural plans, the review is a cross-document check. The finished floor elevation on the building plans should match the pad elevation on the grading plan.