Water Pooling Against Your Foundation? Rain Drainz Installs Exterior French Drains

Signs you need a French drain include water pooling in the same low spots after rain, ground near the foundation that stays soft for days, erosion channels in mulch or lawn, and standing water along the perimeter of your Wilmington home.

Walk your property a day after a hard rain and look for these:

• Standing water against the foundation. Water sitting at the perimeter is the most serious sign, and it carries a legal dimension. Under New Castle County Chapter 12, drainage to the point of open discharge at your property line is the property owner's responsibility, and the County disclaims responsibility where an owner resolves drainage to a neighbor's detriment. Redirecting water without a designed outfall can become your liability, not just your inconvenience.
• Soggy patches that never dry out. If part of the yard stays muddy while the rest firms up, water is traveling sideways along the clay layer and collecting there.
• Erosion around the perimeter. Washed-out mulch beds, exposed roots, or small channels cut into the soil mean water is moving with enough force to carry ground with it.
• Drowned or struggling plants. Saturated soil starves roots of air. Bare patches in otherwise healthy lawn often trace back to poor subsurface drainage.
• Ice sheets in winter. Water that pools in warm months freezes across walkways and driveways in cold ones.

Any one of these means water is not leaving your property the way it should. A French drain gives it a designed path out.

Starting a French drain project with Rain Drainz takes three steps, and they are the same three steps for every service we offer:

Pooling water at the foundation sometimes starts at a clogged gutter or a short downspout, not in the yard at all. Because we manage water from roof to ground, we diagnose the whole path before recommending a trench. You get one plan and a single point of accountability, not three contractors pointing at each other.

French drain installation by Rain Drainz starts with marking utilities and confirming where the restrictive soil layer sits on your property. The trench is then excavated to intercept water at the depth it actually travels, not at a default depth.

From there, the build follows a fixed sequence:

1. Line the trench with filter fabric. Filter fabric helps keep sediment out of the system so the drain can keep flowing.
2. Set the perforated pipe. The pipe is pitched and verified toward the discharge point.
3. Surround the pipe with washed gravel. Washed gravel lets water pass through freely for decades, not years.
4. Confirm the discharge path. Before we backfill, we confirm the pitch carries water to a designed, legal outfall.
5. Backfill and restore the surface. We grade the yard clean, restore the work area, and walk you through exactly where the system runs and where it discharges.

You know what is under your lawn and where every drop goes.

French drain installation at most Wilmington homes takes one to two days. Trench length, depth to the clay layer, discharge distance, and access for equipment set the schedule. Long runs or tight side yards can add a day.

Weather is the other variable. We do not trench in saturated ground when it compromises the pitch or the restoration, so a stretch of heavy rain can shift a start date by a day or two. We tell you before it happens, not after.

French drain installation in Wilmington, DE typically costs $4,000 to $10,000 for a complete exterior system. Trench length, digging depth, discharge distance, and site access set the final price, which we confirm in a free written estimate.

Here is what moves the number:

• Trench length. A 30-foot run along one wall costs less than a system wrapping two sides of the house.
• Depth to clay. The drain must sit at or below the layer that moves water sideways. Deeper clay means a deeper trench and more excavation.
• Discharge distance. Water needs a legal, designed outfall. A longer carry to daylight or to an approved discharge point adds pipe and labor.
• Access and restoration. Fenced yards, mature landscaping, and hardscape crossings take more care and more time.
• Permitting. New Castle County requires sediment and stormwater review for any disturbance over 5,000 square feet. Most residential French drains fall well under that threshold, and we confirm before work begins.

Every estimate is free, written, and specific to your property. No allowances, no surprises at the end.

A French drain handles water moving underground through soil. A catch basin collects concentrated runoff at a low point. A surface drain captures sheet flow across patios and driveways. Many Wilmington yards need one, and some need a combination.

The quick test: if the ground is wet but you never see flowing water, the problem is subsurface and a French drain is the tool. If water visibly collects in one low spot, catch basin installation is usually the answer. If water races across pavement toward the house, look at surface drain installation.

For a full breakdown with local examples, read our guide: French drain vs catch basin vs surface drain. And if you are not sure which problem you have, that is exactly what the free water-path walkthrough is for.

A French drain in Delaware soil must sit at or below the clay layer that carries water sideways. In much of New Castle County that layer starts 10 to 14 inches down, so most residential trenches run roughly 18 to 30 inches deep.

The depth is not a standard number. It is set by your soil. Talleyville and Montalto subsoils, common around Claymont and much of northern New Castle County, carry a clay layer starting about 10 to 14 inches down that moves water at roughly 0.60 inches per hour. Rain soaks the first foot, hits that layer, and travels sideways toward your foundation.

Around Hockessin, a dense fragipan layer sits deeper, around 19 to 30 inches down. A drain trenched above the layer that is actually moving the water will miss most of it. This is why we check where the restrictive layer sits on your property before we quote a depth, rather than digging to a default.

Every storm sends the same water to the same low spot beside your house. The soil under your yard is not going to change, but the path the water takes can. An exterior French drain, built right, moves that water away for decades.

Rain Drainz designs and installs French drains across Wilmington and New Castle County, roof to ground, one crew, one company standing behind the work.