How to Grade Soil Around a House

Regrading around a house comes down to three moves: build soil up against the foundation, slope it down and away for the first several feet, and keep the finished soil well below the siding and the foundation’s damp-proofing line. Do that and storm water runs away from the wall instead of collecting against it. It is the cheapest, most effective drainage fix most homeowners can make, and it addresses the single most common cause of water at the foundation.

Why grading comes first

Water goes where the ground sends it. If the soil around your house slopes even slightly back toward the wall, every rain delivers water to exactly the spot you least want it — against the foundation, where it saturates the soil, presses on the wall, and finds any crack or gap. A surprising number of “mystery” wet basements trace back to nothing more exotic than a negative slope, sometimes one that developed slowly as fill settled over the years.

Grading fixes the problem at the source: it changes where the water goes before it ever reaches the wall. That is why it belongs at the top of the list, ahead of interior fixes or sealing. It is the foundation of the whole water path, and foundation grading basics covers the underlying principles in more depth. Here we focus on doing the regrade.

The three moves

Build up against the foundation

Start by adding soil so the ground is highest right at the wall. The goal is a distinct high point at the foundation that falls away from there. You are not just filling a low spot; you are establishing the top of a slope. Add soil in layers rather than one big dump, because loose fill needs to be worked and compacted as you go (more on that below).

Slope down and away

From that high point at the wall, the ground should drop steadily as it moves out. A widely cited guideline is a fall of roughly six inches over the first several feet from the foundation — think of it as a noticeable, deliberate slope rather than a barely-there tilt. Treat that figure as a starting point, not a precise specification: your lot, your soil, and how the surrounding yard drains all affect what actually works. The principle is what matters — water should always be running away from the wall, never toward it, for the first several feet at minimum.

Where the yard beyond can carry water off, you can let the slope ease once you are clear of the foundation zone. The critical stretch is the first several feet against the house.

Keep below the siding and damp-proofing

This is the constraint that overrides the urge to pile soil higher. Keep the finished soil several inches below the bottom edge of the siding, and below the top of the foundation and any damp-proofing coating on the wall. Two reasons: soil against siding traps moisture and invites rot, and soil piled above the foundation’s protective line lets water bypass that protection entirely and soak into materials never meant to sit in wet earth. If honoring this gap costs you some slope, keep the gap and make up drainage another way — it is not negotiable.

Soil choice and compaction

What you grade with matters as much as the shape you give it.

For the sloped layer against the foundation, a soil with some clay content that sheds water is generally preferred over a loose, sandy fill. A sandy or overly loose fill lets water sink straight down right at the wall — which defeats the purpose, since the whole point is to move water away rather than let it soak in against the foundation. You can finish with topsoil and grass on top for a healthy lawn; it is the shaping layer underneath that should shed water outward.

Compaction is the step people skip and regret. Loose fill settles over the first season, and when it settles it sinks — often reversing the very slope you built and leaving a fresh low spot against the wall. Add soil in lifts (layers), tamping each one before adding the next, so the finished grade holds its shape instead of sagging back toward the house. A slope that survives the first winter is worth more than a perfect-looking one that collapses in spring.

Quick reference

Step	What to do	Why it matters
Build up	Make the soil highest at the wall	Establishes the top of the slope
Slope away	Fall over the first several feet (guideline ~6 in.)	Sends water away from the foundation
Keep below siding	Leave several inches to the siding/damp-proofing	Prevents rot and bypassed protection
Choose soil	Water-shedding soil for the sloped layer	Moves water away instead of soaking in
Compact	Add in lifts, tamp each layer	Stops settling from reversing the slope

Work down the list in order. The shape does the drainage; the soil and compaction make the shape last.

Common mistakes

• Grading up over the siding. Piling soil against or above the siding traps moisture and invites rot, and lets water bypass the foundation’s protection. Keep the gap.
• Skipping compaction. Loose fill settles and can reverse your slope, dropping a low spot right at the wall. Add in lifts and tamp.
• Using loose, sandy fill against the wall. It lets water sink straight down at the foundation instead of shedding it away. Use a water-shedding soil for the sloped layer.
• Grading the first few feet but ignoring the rest. If the yard beyond channels water back, the near slope is not enough. Make sure water has somewhere to go once it leaves the foundation zone.
• Fighting the downspouts. Grading sends surface water away, but a downspout dumping at the wall reloads the soil every storm. Extend the discharge past the graded zone — see water pooling near the foundation.
• Treating grading as waterproofing. Grading reduces water reaching the wall; it does not seal it. And it does not fix a structural crack — that is a professional’s call.

The takeaway

Grading is the highest-value drainage move a homeowner can make because it changes where water goes before it ever reaches the foundation. Build the soil up at the wall, slope it down and away over the first several feet, and keep it well below the siding and damp-proofing — then choose a water-shedding soil and compact it in layers so the slope lasts. The six-inch guideline is a starting point, not a rule; the real target is water always running away from the house. Because every lot and soil is different, treat this as a framework, pair it with downspout extensions and other fixes as needed, and route any sign of cracking or movement to a licensed professional.