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Grade the finished soil so it falls continuously away from the foundation on every side. A common target is at least 0.5 inch of drop per foot for 10 feet (5 inches total), but some local codes require a 5% slope—6 inches in 10 feet—for soil. Check the rules adopted where the property is located and follow the stricter applicable requirement. Compact suitable backfill, preserve required foundation exposure, and use an approved swale or drainage system if the site cannot provide the full 10-foot run.
How much should soil slope away from a foundation?
For a typical residential lot, plan for a continuous fall away from the wall. Federal energy-efficiency guidance commonly uses 0.5 inch per foot for 10 feet, which works out to 5 inches of drop over that distance. Some codes use a steeper 5% target: 5% of 10 feet is 6 inches. These figures are close, but they are not identical, so the local requirement matters.
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For example, the 2021 Seattle Building Code requires a 5% fall for 10 feet in its standard provision, with an exception allowing 2% where climate or soil conditions warrant. It also sets a 2% fall away from the building for nearby impervious surfaces. That is a Seattle code example, not a rule that applies automatically in other jurisdictions. Confirm which code edition your building department has adopted and whether local amendments, permits, or approved discharge requirements apply.
Keep the finished grade positive—that is, lower as you move away from the house—without creating a dip that holds water beside the foundation. The grade also needs a safe place for runoff to go. A slope that meets a number on paper but ends at a low spot, directs water toward the house elsewhere, or sends runoff onto a neighbor’s property does not solve the drainage problem.
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What should I check before moving soil?
Before excavating or adding fill, confirm the controlling requirements and map where the water will go. This avoids doing the grading twice or creating a drainage problem beyond the property.
- Check local rules. Ask the building or public works department which grading and drainage requirements apply, including any permit, inspection, or engineered-plan requirements. Code adoption and local amendments vary.
- Identify the discharge point. Find out where runoff may lawfully and safely drain. Check relevant easements and avoid routing concentrated water onto adjoining land or toward another building.
- Locate buried utilities before digging. Use the applicable local utility-location service and follow its instructions before excavation. Do not assume utility lines are where old plans or visible fixtures suggest.
- Look for constraints. Note property lines, retaining walls, steep ground, paved areas, window wells, utility features, and other obstacles that limit the available grading distance. If these prevent a straightforward slope, plan for an approved drainage alternative rather than forcing a short, steep grade.
- Check foundation exposure and wall details. Find the clearance required by local code and the particular wall assembly. EPA moisture-control guidance calls for at least 8 inches of exposed foundation after final grading; treat that as guidance, not as a universal code requirement. Do not cover siding, wall openings, or components that need clearance.
- Consider the soil and the amount of earthwork. Organic material and debris are not suitable structural backfill under the cited Seattle code. Questionable or expansive soils, steep slopes, erosion risk, controlled fill, and large cuts or fills call for professional advice.
How do I calculate the fall over 10 feet?
Measure horizontally outward from the foundation, perpendicular to the wall, then compare the ground elevation at the wall-side reference point with the elevation at the outer edge of the grading zone. The required fall is the difference between those elevations.
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|---|---|---|---|
| 0.5 inch per foot | 0.5 inch | 5 inches | Common U.S. Department of Energy building-science guidance |
| 5% slope | 0.6 inch | 6 inches | A requirement in some adopted codes; used in EPA moisture-control guidance |
| 2% slope | 0.24 inch | 2.4 inches | Used for impervious surfaces in some codes; not a general replacement for a soil-grade requirement |
These conversions use 12 inches in a foot: a 5% slope drops 0.05 × 120 inches, or 6 inches, across 10 feet. Likewise, 2% drops 2.4 inches across 10 feet. The 2% figure should not be substituted for a soil requirement simply because it appears in a code for patios, sidewalks, or other impervious surfaces. Confirm which surface category and exception, if any, apply to your project.
Use the applicable target over the required horizontal distance. If a local rule says 5% for 10 feet, five inches of fall is short even though it meets the commonly cited 0.5-inch-per-foot guidance. If the site cannot provide that distance, ask the local authority what alternative is acceptable.
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How do I set and shape the grade?
Once you know the required elevations and discharge route, mark the grade, move soil carefully, and measure the finished result. A string line and line level, laser level, or survey level can help transfer elevations; the tool is less important than checking the actual fall.
- Choose two reference points. Mark the foundation-side elevation for the finished grade and a point at the outer edge of the grading zone. Measure perpendicular to the wall. Calculate the required elevation difference using the applicable slope and distance.
- Set a reference line. Stretch a string between stakes or use a leveling instrument to carry the chosen elevation outward. Mark the target at the outer point so you can see how much soil needs to be removed or added. Check several points along each wall rather than assuming the ground is even.
- Protect the foundation assembly. Work without damaging waterproofing, drainage components, or other wall details. Keep the required foundation exposure and clearance; do not bury vulnerable wall materials to gain height.
- Cut high areas and fill low areas. Shape a continuous plane, or a deliberately designed contour, that carries water away from the building. Do not leave a channel or depression next to the wall. Use suitable fill rather than organic material or construction debris.
- Place backfill in controlled lifts and compact it. Add and compact manageable layers rather than placing a deep loose mound that can settle later. Department of Energy guidance calls for mechanical compaction; PNNL also advises tamping backfill and checking the finished grade after settlement. The Seattle code specifies backfill free of organic material and debris, placed in lifts and compacted without damaging waterproofing.
- Check the final surface. Measure the fall at multiple points around the home, including transitions and corners. Confirm that it remains positive away from the wall and that the route reaches a safe outlet instead of a new low spot.
For limited residential touch-ups, a hand tamper can compact small amounts of soil; larger or more consequential fill may need appropriate mechanical equipment and qualified help. Compaction is not a substitute for sound soil or a designed solution. If the fill supports a foundation, if its stability is uncertain, or if the work is extensive, stop and get professional guidance.
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Do not try to squeeze the full fall into a very short strip without approval or design advice. Keep positive drainage at the foundation, then use a solution accepted for the site and its discharge conditions, such as a swale, drain, or engineered alternative.
A swale is a shaped, shallow route for moving surface water. Its location and outlet matter: it should not simply end where water ponds beside the wall, and it should not send runoff onto neighboring property. A drain or perimeter-drain system also needs an approved place to discharge and may need professional design. The appropriate choice depends on grade, soils, walls, existing drainage, and local rules; no universal detail applies to every constrained lot.
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Ask the local authority or a qualified drainage professional to confirm the acceptable alternative before installing it. This is especially important where a retaining wall, steep slope, erosion hazard, easement, or neighboring property could be affected. A drain that has nowhere appropriate to discharge only relocates the problem.
How should patios, driveways, and roof runoff be handled?
Do not rely on soil grading alone when roofs and hard surfaces collect and concentrate water. Keep paved surfaces falling away from the building or provide drains, and route roof runoff to an approved outlet such as a suitable swale or drywell.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Impervious surfaces behave differently from soil: water runs off rather than soaking into the surface. Some codes therefore specify a separate fall for pavement. The 2021 Seattle Building Code example requires at least 2% away from the building for nearby impervious surfaces. Check the local rule for the specific surface, because the required slope and acceptable drainage arrangement may differ from those for soil.
Check that gutters and downspouts carry water to the intended outlet, rather than dumping it at the foundation or onto a surface that channels it back toward the house. The outlet must be allowed by local requirements and should not create erosion, ponding, or a nuisance for adjoining land. If the outlet is blocked, too close to the house, or otherwise unsuitable, resolve that issue as part of the drainage plan.
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How do I know whether the grade is working?
Check the slope again after backfill settles and after rain. Look for ponding near the foundation, newly formed depressions, erosion, or any place where runoff turns back toward the wall. Repair low spots and verify the water’s route all the way to its outlet, not just across the first few feet of soil.
Settlement can change a grade that looked correct immediately after construction. PNNL notes that final grading may be scheduled after settling, including after the first rainy season where appropriate. That timing is not a universal schedule; the relevant point is to inspect the actual settled surface and restore the required fall if it has changed.
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Also check the outlet and any drainage system for obstructions or damage. A clear-looking slope cannot compensate for a blocked drain or a roof discharge that repeatedly saturates one area. If water still collects at the wall, identify whether the cause is a low spot, roof runoff, paved-surface runoff, a constrained outlet, or a broader site condition before adding more fill.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When should I hire an engineer or soils professional?
Get qualified design help when earthwork or drainage could affect the stability of a foundation, slope, retaining wall, or neighboring property. Seek help for controlled fill supporting a foundation, questionable or expansive soils, steep slopes, erosion risk, extensive cuts or fills, or a drainage system with a complicated discharge route.
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Federal housing regulation 7 CFR §1924.108 requires professional-engineer design for extensive cuts and fills of 4 feet or more in its applicable context. That is a specific federal housing rule, not a blanket statement that every four-foot earthwork project everywhere is governed by the same requirement. Local officials may impose separate permit or engineering requirements. Confirm the scope of any regulation that may apply to the property.
Professional advice is also prudent if water is moving toward a neighbor, a retaining wall is involved, the needed grade would cover foundation details, or a drain’s outlet is uncertain. Do not treat a slope percentage as a complete drainage design: it describes fall, but it does not by itself establish that the soil is stable, the discharge is legal, or the system can handle site conditions.
Common grading mistakes to avoid
- Using the right number for the wrong surface. A slope specified for pavement may not satisfy a soil-grade rule. Check both the surface type and the adopted local code.
- Measuring only beside the wall. A small near-wall fall can still lead to a low spot farther out. Follow the grade to its outlet and inspect the entire drainage route.
- Leaving loose fill. Uncompacted backfill can settle and reverse the intended slope. Place suitable soil in lifts, compact it appropriately, and check again after settlement.
- Raising grade too high against the wall. Preserve the required foundation exposure and assembly clearances. EPA guidance recommends at least 8 inches exposed after final grading, but confirm what applies locally and to the wall construction.
- Sending runoff somewhere else without a plan. A swale or drain needs an acceptable outlet. Avoid ponding, erosion, and discharge onto neighboring property.
- Ignoring the roof and hardscape. Gutters, downspouts, patios, sidewalks, and driveways can deliver water directly toward the foundation unless their runoff is directed away.
- Assuming one inspection is enough. Settling and weather can alter the grade. Recheck after rain and when backfill has settled, then correct any low areas.
Which slope should I use?
Use the locally adopted requirement for the actual surface, with applicable exceptions confirmed by the authority having jurisdiction. If no stricter local rule applies, the common 0.5-inch-per-foot guidance provides a practical reference for a 10-foot soil run; some codes and guidance use 5%, or 6 inches over 10 feet. Keep the grade continuous, protect foundation clearance, compact suitable backfill, and plan the outlet before shaping the ground.
Frequently Asked Questions
Can grading alone solve water in a basement?
Not necessarily. A positive surface slope can reduce water collecting beside the foundation, but basement moisture can have other causes; persistent seepage warrants a broader assessment of the foundation and drainage system rather than repeatedly adding soil.
How far should a downspout discharge from the house?
There is no single distance established for every site in the cited guidance. The important requirements are to carry roof runoff to an approved outlet, keep it from draining back toward the foundation, and avoid creating erosion, ponding, or a problem on neighboring property.
Is a swale better than a drain on a tight lot?
Neither is universally better. A swale moves surface water along a shaped route, while a drain collects and conveys water; the right choice depends on the site, soils, available space, and an acceptable outlet. Get local approval or design advice when those constraints are significant.
