How to Regrade Soil Away From Your House (Stop Water Damage)

TL;DR: The standard grading rule is a 6-inch drop in elevation over the first 10 feet away from your foundation, roughly a 5% slope. Most owners can fix minor grading issues themselves with topsoil, a rake, and a hand tamper for under $200. If the slope is already correct but water still pools, the problem is usually downspouts, not the dirt.

_Last reviewed: July 2026 · 7 min read_

Water pooling next to your foundation is one of those problems that looks minor until it isn't. A soggy flower bed today can turn into a cracked foundation wall or a wet crawl space in three to five years. Here's how to fix the slope around your house before that happens.

Okoniq Property Hub helps owners log grading fixes, downspout extensions, and drainage repairs alongside photos, so there's a record of what was done and when if a foundation issue ever comes up later.

How much slope do you actually need away from your foundation?

The standard is 6 inches of drop over the first 10 feet from the foundation wall, which works out to about a 5% grade. Building codes in most US jurisdictions reference this same figure, often citing the International Residential Code's minimum of 6 inches within 10 feet for soil, or 2% for hardscape like patios and walkways.

You can check your current slope with a 4-foot level and a tape measure. Set one end of the level at the foundation, hold it level, and measure the gap at the far end. On a 4-foot level, you want roughly 2.4 inches of drop to be on pace for the 6-inch-over-10-feet standard. If the ground is flat or, worse, sloping toward the house, that's your answer for where water is coming from.

Don't overdo the slope either. Anything steeper than 1 inch per foot near a foundation can cause erosion and washes topsoil away every time it rains hard, which just creates a new low spot two years later.

What tools and materials do you need to regrade soil yourself?

For most one-story house perimeters, you need topsoil or a topsoil/sand mix (not pure clay, which drains poorly), a garden rake, a hand tamper or plate compactor for larger areas, and a 4-foot level or laser level to check your work. Budget $3 to $6 per bag of topsoil, and a typical 40-foot foundation run might need 15 to 25 bags depending on how much low spot you're filling.

Start by removing mulch, sod, or existing plants within 2 feet of the foundation. Add soil in 2-inch lifts, tamping between each layer, working outward from the house. Don't just dump loose soil and walk away. Loose fill settles unevenly and you'll be back out there in six months looking at the same puddle.

Once the slope is set, cap it with 2 to 3 inches of mulch or gravel against the foundation itself, both for looks and to slow erosion during heavy rain.

What if the grading is already correct but water still pools near the house?

If your slope checks out at 6 inches over 10 feet and you're still seeing standing water, the culprit is almost always the downspouts, not the dirt. A downspout that dumps 4 feet from the foundation instead of 6 to 10 feet away will recreate a wet spot no matter how well the ground is graded. This is one of the most common downspout mistakes that send water into your basement.

Extensions are cheap, usually $15 to $40 per downspout, and are the single highest-return fix in this category. Before you touch the grading, walk the perimeter during a rainstorm and watch where each downspout is actually discharging. You may find downspouts dumping water in the wrong place is doing more damage than the yard's contour ever could.

| Fix | Typical Cost | Time to Complete | |---|---|---| | Regrade soil (DIY, one-story perimeter) | $50–$150 | A weekend | | Downspout extensions (4 corners) | $60–$160 | 1–2 hours | | Hire a grading contractor | $500–$3,000+ | 1–3 days |

When does regrading mean calling a contractor instead of doing it yourself?

Call a contractor if the low spot is more than 6 inches deep across a large area, if the house has a basement showing active seepage, or if you're dealing with clay-heavy soil that won't drain no matter how it's shaped. In those cases, a contractor may recommend a French drain or a swale in addition to regrading, and pricing typically runs $1,500 to $5,000 depending on the scope.

It's also worth calling a pro if you notice cracks widening in the foundation or if signs point to a slab leak under the floor rather than surface water. Grading fixes surface drainage. It does nothing for water coming from a broken pipe under the slab, and mixing up the two causes leads people to waste a season regrading a yard that was never the actual problem.

FAQ

How often should I check the grading around my house?

Check it once a year, ideally in early spring after frost heave and winter settling have had time to shift the soil. Also check after any major landscaping work, since new sod or mulch beds are a common way people accidentally create a reverse slope.

Can I regrade soil myself or do I need a professional?

Most owners can regrade a single-story foundation perimeter themselves in a weekend for under $200 in materials. Professional grading, usually needed for larger low spots or clay soil, runs $500 to $3,000 depending on the yard size and equipment needed.

What type of soil is best for regrading near a foundation?

Use a topsoil and sand blend that compacts well and drains, rather than pure clay or pure sand. Clay holds water against the foundation, and pure sand erodes too fast in heavy rain.

Will regrading fix a wet basement on its own?

Grading fixes surface water that pools and seeps in near the top of the foundation, but it won't fix a rising water table or a cracked foundation wall below grade. If a wet basement persists after correct grading and downspout extensions, the next step is usually an interior or exterior drain system, which is a job for a waterproofing contractor.

How close should mulch or soil come to the siding?

Keep the top of the soil or mulch at least 6 inches below the bottom of the siding or the top of the foundation. Piling soil higher than that traps moisture against wood siding and can attract termites.

This is educational information, not engineering advice. Call a licensed foundation or drainage contractor if you're seeing active water intrusion, foundation cracks, or standing water that doesn't clear within 24 hours of a fix.