The Short Answer
A grading plan is an engineered drawing that shows how a site's ground surface will be reshaped — where soil is cut away, where it is filled, and what the finished elevations will be. It controls how water drains, how vehicles and people access the site, and how the earth stays stable. A licensed civil engineer prepares and stamps the grading plan, which most jurisdictions require before earthwork or building permits are issued.
What a Grading Plan Shows
Existing and Proposed Contours
The plan overlays existing ground contours (from the survey) with the proposed finished contours. The difference between the two defines the cut and fill — where dirt is removed and where it is added. Spot elevations at critical points such as building corners, pavement, and drainage structures give contractors precise targets.
Drainage and Slope
Grading directs water. The plan establishes slopes that carry runoff away from buildings, toward inlets, swales, or detention, and off the site in a controlled manner. Minimum and maximum slopes are set to prevent both ponding and erosion, and to meet accessibility requirements on walkways and parking.
Earthwork Balance
A well-designed grading plan tries to balance cut and fill on site so that excess soil does not have to be hauled off and additional soil does not have to be imported. Earthwork quantities are a significant cost factor, and thoughtful grading reduces both cost and construction impact.
Stability and Retaining
Where elevation changes are steep, the plan may call for retaining walls or engineered slopes. Geotechnical recommendations inform these decisions so that graded surfaces and walls remain stable over time.
How a Grading Plan Fits With Other Documents
The grading plan works alongside the drainage plan, utility plan, and overall civil site plan. Grading and drainage are closely linked — you cannot design one well without the other. On many permit sets, grading and drainage are shown together or cross-referenced, and both rely on the same survey and geotechnical data.
When Do You Need a Grading Plan?
You typically need a grading plan when a project moves earth: new construction, additions, parking lots, site redevelopment, or any work that changes site elevations or drainage patterns. Many jurisdictions require a grading permit once earthwork exceeds a defined threshold of area or volume. If your project involves reshaping the ground, adding pavement, or altering how water flows across the site, plan on a grading plan.
Frequently Asked Questions
Who prepares a grading plan?
A licensed civil engineer prepares and stamps the grading plan, using the surveyor's topographic survey and the geotechnical report as inputs.
Is a grading plan the same as a drainage plan?
They are related but distinct. Grading defines the shaped surface; drainage defines how water is collected, conveyed, and released. They are designed together and are sometimes shown on the same sheet.
What triggers a grading permit?
Thresholds vary by jurisdiction, but disturbing a certain area or moving a certain volume of soil generally triggers a permit. We confirm local requirements for your site during design.