What does soil sloping toward your house cost?
Updated August 2026
← What skipping home maintenance costs
Regrading the soil so it falls away from the house costs $200–800 as a DIY afternoon or $1,000–3,000 professionally, while ground that slopes back toward the wall feeds a wet basement and foundation damage that runs $5,000–30,000. The target is simple: the dirt against the house should drop about 6 inches over the first 10 feet. When it does the opposite, every rain runs downhill into the foundation, saturating the soil against the footing and pushing water through the wall. Left alone, that chronic pressure cracks the foundation, floods the basement, and grows mold. Grading is one of the cheapest fixes on the property and one of the costliest problems to ignore. Here is the ladder.
The escalation ladder
Every row below is the same leak, left a little longer. The top is a cheap warning; the bottom is a claim.
| What happens | Typical bill | How fast |
|---|---|---|
| You add soil and reslope to fall 6 in. over 10 ft | $200–800 in fill and a weekend, DIY | A weekend |
| A landscaper regrades and tamps the perimeter | $1,000–3,000 around the house | 1–2 days |
| Water starts seeping in after heavy rain | $500–2,000 for sealing and interior fixes | 1–2 rainy seasons |
| A wet basement grows mold and ruins finishes | $5,000–15,000 in remediation and rebuild | 2–5 years |
| Standing water pressure cracks and bows the wall | $10,000–30,000+ in structural repair | Years of neglect |
Warning signs
Bad grading shows itself right after a storm. Walk the perimeter while it is still raining and look for puddles standing against the foundation, soil eroded into a trough beside the wall, and mulch or dirt washed onto the walkway. Inside, watch for a damp or musty basement after rain, water stains low on the foundation wall, efflorescence (a white mineral crust), and cracks that weep. Downspouts dumping right at the wall make it all worse. If water pools within a foot of the house instead of running off, the grade is working against you.
The prevention math
The prevention is a $200–800 load of soil and an afternoon with a rake and a level, building the ground back up so it falls away from the house, then rechecking it each year after the soil settles. Do it alongside your downspouts and gutters, since the three drainage problems compound: fixing one and not the others just moves the water. Against a $5,000–30,000 wet-basement and foundation repair, a few yards of dirt is the best return in the yard. See how often to check foundation grading and the cost of downspouts draining at the foundation, then add both to your home maintenance checklist.
Every line in that table starts with a skipped 10-minute task. OnOtto keeps the 10-minute version on your calendar so the $2,000 version never happens.
Get the nudge before the billFrequently asked questions
How much should the ground slope away from a house?
The standard is a drop of about 6 inches over the first 10 feet away from the foundation, roughly a 5 percent grade. That is enough to carry rainwater off before it can soak into the soil against the footing. Beyond the first 10 feet the slope can flatten. If you set a level on the ground near the house and it reads flat or tips back toward the wall, you have negative grading and rain is draining exactly where you least want it.
Can bad grading really flood a basement?
Yes, and it is one of the most common causes. When soil slopes toward the house, rain collects against the foundation and saturates the ground, building pressure that forces water through cracks, cold joints, and porous block. You end up with a basement that is dry all summer and wet after every storm. The fix almost always starts outside with grading, downspout extensions, and gutters rather than with interior sealers, because stopping water at the soil is cheaper and more permanent than fighting it at the wall.
Should I fix grading or waterproof the basement first?
Fix the grading first, along with the gutters and downspouts, because they are the source. Regrading is $200–3,000 and removes the water before it reaches the wall; interior waterproofing systems run several thousand and only manage water that is already getting in. Plenty of chronically wet basements dry out once the outside drainage is corrected. If water still intrudes after the grade, downspouts, and gutters are right, then a contractor should look at deeper fixes like an exterior membrane or a French drain.