How to Grade Soil Away From Foundation (Protect Your Home in 4 Steps)

TL;DR: Your yard should slope at least 6 inches down over the first 10 feet away from your foundation to prevent water pooling against the house. You'll need a tamper, clean fill dirt, a 4-foot level or transit tool, and a plan to check drainage after heavy rain. Most DIY re-grades cost $200–$600 in materials and take a weekend; severe slopes or retaining walls require a contractor.

_Last reviewed: July 2026 · 6 min read_

Water pooling against your foundation causes more repair bills than almost any other drainage issue—basement leaks, crawlspace moisture, concrete cracks, and eventually structural movement. The fix is grading: shaping the soil so water flows away from the house instead of toward it. Most older homes settle over decades and lose their original slope; re-establishing it is straightforward if you catch it early.

Okoniq Property Hub logs every grading project with photos and costs, so you have a date-stamped record if you later add French drains or apply for basement waterproofing work.

What slope does the ground need around a foundation?

The standard is a 6-inch vertical drop over the first 10 horizontal feet from the foundation wall. That's a 5% grade—steep enough to move storm water but shallow enough to plant grass or mulch. You measure from the point where the siding meets the soil (or the top of a brick foundation) outward to a marker 10 feet away, then check that the ground drops at least 6 inches over that distance.

If your lot is flat or slopes toward the house, water collects against the foundation during rain. Clay soils make it worse—water sits on the surface instead of percolating down. Over time, hydrostatic pressure pushes moisture through concrete block, causing efflorescence (white powder) inside the basement or lifting vinyl flooring in finished spaces.

Some jurisdictions enforce the 6-in-10-ft rule in their building codes; others recommend it. Either way, every structural engineer and foundation-repair contractor will tell you the same number. If your yard doesn't meet it, plan to fix it before you see interior water.

How do you measure and map the current grade?

Start with a 4-foot level and a straight 2×4 board at least 10 feet long. Place one end of the board against the foundation at grade level, extend it horizontally using the level, then measure the gap between the board's far end and the soil. That gap is your vertical drop. Repeat at 4–6 spots around the perimeter, especially near downspout discharge points and on the uphill side of a sloping lot.

For larger properties or if you need precision for a permit, rent a laser transit or rotary level ($40/day at tool-rental counters). Set it on a tripod, spin the laser to mark a horizontal reference plane, then use a grade rod to record elevations every 5–10 feet. You'll build a simple elevation map showing high and low spots.

Mark problem zones with landscape flags—anywhere the ground slopes back toward the house or sits flat within 10 feet of the wall. Take photos from the same spot each time you measure, and log them in your property records. These "before" shots matter if you later file an insurance claim tied to water damage from poor drainage.

Most homes have two or three trouble spots rather than a full perimeter issue: a settled area near an old flowerbed, a low swale where runoff collects, or a corner where a downspout used to dump directly onto the soil. Address those first.

What materials and tools do you need for a re-grade?

You'll need clean fill dirt—not topsoil, which compacts poorly and washes away. Order "fill dirt" or "structural fill" by the cubic yard; most suppliers deliver 5–10 yards for $150–$300. Calculate volume by measuring the length and width of each low area and estimating the average depth you need to add, then multiply (length × width × depth ÷ 27 = cubic yards). Add 20% for compaction loss.

A hand tamper or plate compactor is essential. Hand tampers ($30–$50) work for small patches; rent a gas-powered plate compactor ($60–$80/day) if you're filling more than 50 square feet. Loose fill will settle 15–25% over the first year, so compact every 2–3 inches as you add layers.

You'll also want a steel rake, a flat shovel, landscape fabric (optional, to prevent weeds in mulched areas), and a wheelbarrow. If the grade change is more than 12 inches in one spot, you may need a short retaining wall of treated timbers or concrete blocks to hold the slope; anything taller than 18–24 inches should be engineered and built by a pro.

Avoid placing fill dirt above the siding line or brick weep holes—keep at least 6 inches of clearance between the soil and any wood framing to prevent rot and termite entry. That means you may need to excavate first if the current grade is too high near the house.

How do you install and compact the new grade?

Start by removing vegetation in the work zone—grass, weeds, old mulch—down to bare soil. If the existing soil is clay and rock-hard, scarify the surface with a rake so the new fill bonds to it. Lay down 2–3 inches of fill dirt, rake it smooth to follow the 6-in-10-ft slope, then compact it with the tamper (or plate compactor) until it's firm and doesn't leave a boot print.

Repeat in layers until you reach the target grade. At each layer, spray a light mist of water if the dirt is dusty—it compacts better when slightly damp, but don't make mud. The goal is a smooth, firm slope that sheds water without gullying.

Once the final layer is compacted, you can seed grass, spread mulch, or lay sod. Grass takes 3–4 weeks to establish; mulch is faster and holds the soil in place immediately. If you mulch, use 2–3 inches of shredded hardwood or pine bark and refresh it every 2 years as it decomposes.

Check the grade after the first two or three heavy rains. Walk the perimeter and look for standing water, erosion channels, or soft spots. Minor settling is normal—add a thin layer of fill and re-compact if needed. If water still pools against the foundation after the re-grade, you may have a subsurface spring or need to add a French drain or curtain drain behind the fill.

When should you hire a contractor instead of DIY?

Hire a grading contractor or civil engineer if:

• The lot slopes severely toward the house and you need to move more than 20 cubic yards of soil.
• You need a retaining wall taller than 2 feet to hold the new grade.
• The foundation shows active cracks, bowing, or settlement—grade work alone won't fix structural damage; you need a foundation-repair specialist first.
• Local code requires a grading permit and stamped plan (common in floodplains or hillside lots).
• You have underground utilities (gas, electric, sewer) within 3 feet of the foundation—call 811 for locates before you dig, and let a pro handle excavation near marked lines.

Professional grading costs $1,500–$5,000 for a typical single-family perimeter, depending on soil volume and access. If a skid-steer or excavator is required to reach the work area, expect the higher end of that range. Get three quotes and ask to see photos of completed projects with similar slope challenges.

For landlords managing multiple properties, fixing grading issues as they appear is far cheaper than emergency foundation repair or mold remediation years later. Log each project in your maintenance records with before/after photos, vendor invoices, and a note about the final grade measurement—it's proof you maintained the property to a reasonable standard.

FAQ

How long does a re-grade last before settling?

A properly compacted fill-dirt grade lasts 10–20 years before you need to add a thin topdressing. The first year you'll see 10–15% settling even with good compaction; after that, erosion from rain and foot traffic causes slow, gradual loss. Check the slope every spring and top up low spots with an inch or two of fill as needed.

Can I use topsoil instead of fill dirt?

No—topsoil has too much organic matter and compacts poorly. It's meant for planting, not structural grading. Use clean fill dirt (clay, sand, or loam with minimal organics) for the base layers, then spread 1–2 inches of topsoil or compost on top if you're seeding grass. Mixing the two or using pure topsoil will cause the grade to slump within a year.

What if the driveway or sidewalk is too close to the foundation to create a 6-inch slope?

You have three options: (1) cut a shallow trench along the edge of the concrete and install a channel drain with a pipe leading away from the house; (2) raise the grade on the lawn side as much as possible and rely on good gutter and downspout maintenance to handle roof runoff; or (3) if the concrete itself slopes toward the house, resurface or replace it to reverse the pitch. Option 1 is the most common DIY fix.

Do I need a permit to re-grade my yard?

Most jurisdictions don't require a permit for minor grading (under 50 cubic yards) that doesn't alter drainage onto a neighbor's lot or a public right-of-way. If you're building a retaining wall over 4 feet tall, excavating near a septic system, or working in a floodplain, check with your local building department first. Unpermitted work can complicate a sale or trigger a stop-work order if a neighbor complains.

Will fixing the grade stop water in my basement?

It will stop surface water from pooling against the foundation and seeping through cracks or joints. It won't fix a high water table, underground springs, or failed interior drain tile. If you still see water after re-grading and confirming your gutters work, the next step is a basement waterproofing evaluation—likely exterior excavation and a perimeter drain or an interior sump system.

This is educational information, not engineering or contracting advice. Consult a licensed civil engineer or foundation specialist if your home shows structural cracks or significant settlement. Always call 811 before digging near utilities.