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What Is Site Preparation and What Does It Involve?

Everything that happens to your land before a foundation exists, and why it's the least predictable line in the budget.

Site preparation is everything that happens to your land before the foundation goes in. Clearing, staking, excavation, grading, drainage, utility trenching and driveway access. It's the least predictable part of a build budget because it depends entirely on the parcel.

The sequence

  1. Survey and staking. Boundaries confirmed and the house located on the lot, within setbacks.
  2. Clearing. Trees, brush and any existing structures removed from the building area.
  3. Topsoil stripping. Stripped and stockpiled, then reused for final grading later.
  4. Excavation. Digging for the foundation, below frost depth. See footing depth in Northeast Ohio.
  5. Foundation drainage. Footer drains, gravel, and waterproofing or damp-proofing.
  6. Rough grading. Shaping the site so water moves away from the house.
  7. Utility trenching. Water, sewer or septic, electric, gas. See utilities.
  8. Driveway base. Access for construction traffic before it's a finished drive.
  9. Erosion control. Silt fence and stabilization, which is a regulatory requirement, not an optional nicety.
  10. Final grading and stabilization, at the end of the project.

Why the cost varies so much

  • Slope. More grade change means more earth moved and more retaining.
  • Rock. Shallow bedrock turns excavation into a different job entirely.
  • Soils. Poor bearing soil may require undercutting and replacement, or engineered footings.
  • Water. A high water table or a spring means more drainage work.
  • Distance. Long driveways and long utility runs are priced by the foot.
  • Trees. Clearing and stump removal, plus hauling.
  • Septic. A system with a large or engineered field is a significant addition.

Why some of it can't be known in advance

You can survey, test soils and study topography, and those reduce the unknowns considerably. But nobody knows exactly what's four feet down across an entire parcel until they dig. This is exactly what a contingency exists for, and why a homesite inspection happens before construction in our process.

What reduces the risk

Evaluate the lot before you buy it, get soils looked at early, and don't finalize a foundation design before anyone has looked at the ground it's sitting on. See evaluating a lot.