Excavation
Fixing a Raised Backyard That Drains Toward the House
Cojo
April 18, 2026
10 min read
It is surprisingly common. A homeowner walks out back during a storm and realizes the water is running the wrong direction — from the yard, over the grass, across the foundation line, and directly into a crawlspace vent or the base of the siding. It looks like something built wrong decades ago, but most of the time it developed slowly over the years.
The usual culprits are a mix of:
In Oregon's wet climate, a yard draining toward the house is not a cosmetic problem. It is a foundation, crawlspace, and structural problem that gets worse every winter until it is corrected. Most fixes pair regrading with broader backyard regrading for drainage strategies, and the overall price is shaped by the same excavation cost factors as every other residential job.
Industry Baseline Range
| Scope | Unit | Industry Baseline |
|---|---|---|
| Spot regrade (small area near one foundation wall) | flat project | $1,500 – $5,500+ |
| Partial yard regrade with drainage fixes | flat project | $3,500 – $15,000+ |
| Full backyard lowering and regrade | flat project | $6,000 – $30,000+ |
| Excavation + haul-off of raised soil | per cu yd | $40 – $150+ |
| Grading per sq ft | per sq ft | $0.75 – $4.00+ |
| French drain add-on (footing-line) | per linear foot | $25 – $120+ |
| Downspout extension install | per line | $250 – $900+ |
| Dry well install | per unit | $800 – $4,000+ |
| Retaining element (when needed) | per face sq ft | $30 – $95+ |
| Minimum job callout | flat | $500 – $1,500+ |
The industry baseline ranges above represent ideal conditions — easy access, workable soil, shallow depth, and minimal haul-off. In practice, actual project costs frequently exceed published averages by 2 to 3 times when complications arise. Oregon's clay soils, rocky terrain, unmarked utilities, permit requirements, and disposal fees can all push costs well above baseline figures. The only reliable way to know your actual cost is through an on-site assessment.
Many Oregon homes show more than one of these at the same time. The cumulative effect is what causes real damage.
Most Oregon building codes follow the International Residential Code guideline of at least 6 inches of fall in the first 10 feet away from the foundation — roughly a 5 percent slope. Beyond that first 10 feet, 1 to 2 percent is enough to keep water moving.
A raised backyard fix re-establishes that slope. The solution almost always involves cutting soil down near the house and either hauling it off, redistributing it, or transitioning into a terraced or walled design further out — see our sloped backyard solutions guide if the fix needs to step down rather than slope gently.
Lowering a yard near a foundation is the part of small excavation where surprises are most likely:
Experienced crews work carefully inside the first 3 feet of the foundation and hand-finish the last cuts rather than racing through with a machine.
Willamette Valley clay. Clay yards are the most common offenders. Clay holds water, resists natural runoff, and builds up over the years from mulch and landscaping. Lowering a clay yard is slow, heavy work.
Coast range wet sites. Homes on the coast and in the Coast Range deal with some of the highest rainfall in the state. Raised-yard fixes often include more aggressive drainage design — French drains along the footing, dry wells, or a swale that channels water away.
Higher elevations. Bend, Sisters, Sunriver, and similar areas combine freeze-thaw with sudden snowmelt. A raised-yard fix in those regions usually includes a more protective drainage layer against the foundation.
Older homes. Many pre-1970s Oregon homes lack modern foundation drainage. A raised-yard fix often pairs with a footing drain retrofit for full protection.
Jurisdictional differences. Portland, Beaverton, Hillsboro, Gresham, Salem, Eugene, and Bend each have different rules for stormwater, slope alteration, and drainage connections. A contractor who works regularly in your jurisdiction will know what triggers review.
Small, cosmetic corrections — scraping back mulch that has piled up against the siding, extending a downspout further from the house, removing a raised bed built against the foundation — are reasonable DIY projects.
Hire a pro when the correction involves cutting actual soil away from the foundation, installing or connecting a drainage line, working within 3 feet of the house in more than a trim way, or addressing settled foundation backfill. The risk of cutting into a utility, damaging the foundation, or making drainage worse by accident is real. Our guide to hiring a residential excavation contractor walks through CCB verification and estimate red flags.
Small regrades generally do not require a permit. Permits are more likely when:
Residential permit fees usually fall in the $100 – $600+ range when they apply. Some jurisdictions waive or simplify permits for drainage work intended to protect an existing foundation.
A backyard that drains the wrong way almost always starts as a small problem — a damp crawlspace, a little musty smell, a dark patch on the siding. Left alone, it becomes a foundation issue. Fixing the grade early is orders of magnitude cheaper than repairing the damage. If the yard also ponds water in low spots away from the house, pair this with our guide on backyard standing water fixes. Homeowners in east Portland can also review our backyard excavation in Gresham page.
Get a free drainage assessment, review our excavation services, or see examples of foundation-protection work on our project portfolio. Related guides are in our resources section.
How much does it cost to fix a backyard that drains toward the house in Oregon? Industry baseline ranges run $1,500 – $5,500+ for a spot regrade near one foundation wall, $3,500 – $15,000+ for a partial yard regrade with drainage fixes, and $6,000 – $30,000+ for a full backyard lowering with added drainage. Haul-off, drainage structures, and foundation-line work can push actual Oregon costs well above those figures.
Can I just add more mulch to fix the grade? No. Mulch and bark dust on top of an already-high yard make the problem worse. Soil level should be kept below the top of the foundation step and sloped away. Fixing the grade means cutting soil down, not adding to it.
Will a French drain fix this on its own? Sometimes, but usually it is paired with regrading. A French drain along the footing catches water that still reaches the foundation, while regrading prevents most of the water from getting there in the first place. Doing only one often leaves the problem half-fixed.
How long does the fix take? A spot regrade near one foundation wall typically finishes in one to two days. A partial yard regrade with drainage work runs two to five days. Full backyard lowering projects can take one to three weeks, especially with haul-off and drainage structures.
Do I need a permit to lower my backyard in Oregon? Usually no for small cosmetic regrades. A permit is more likely when storm sewer connections are involved, when larger soil volumes are moved, or when drainage changes affect a neighboring property. Confirm with your local building department before starting.
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