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Grading plan
A grading plan is an engineering drawing that shows finished elevations and the intended drainage flow paths across the entire building site.
Why it matters
It is required for permits and ensures water moves away from the foundation, driveway, and structures as intended.
Where people get this wrong
A grading plan is different from a site plan. A site plan shows where the building sits on the lot. A grading plan shows how the land will be shaped for drainage.
Real-world example
The grading plan shows the backyard sloping at 2 percent away from the foundation for the first 10 feet, then transitioning to a swale that carries water to the street.
Where this hits your build
This matters during site work and foundation. Mistakes here get buried and are expensive to fix later. Pay attention before concrete is poured.
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