Drainage & Final Grading Solutions That Actually Work

Piedmont red clay drains at a fraction of the rate sandy soil does. A rain that would soak away in an hour somewhere else sits on the surface here, and on a graded subdivision lot where the topsoil was scraped off during construction, it sits even longer. That is why the same storm floods one yard on the street and not the neighbour’s.

Most of what we get called about is one of four things: water coming off a roof and staying at the foundation, a low spot in the middle of a lawn that never dries, water arriving from a neighbouring property that sits higher, or a crawlspace that smells damp in August. Each has a different fix, and the cheapest one is almost never the right one if the water is arriving from somewhere you did not look.

We walk the property during or right after a rain when we can. Fifteen minutes watching where water actually goes beats an hour of guessing at a dry yard.

• French drain. A gravel trench with perforated pipe wrapped in fabric, set below the wet zone and pitched to daylight. For a saturated area or a wall that needs relief behind it. Runs $25 to $55 per linear foot depending on depth and what it has to cross.
• Surface drains and catch basins. For water that is already on top and needs collecting — a low spot, a patio edge, the bottom of a driveway. Cheaper than a French drain and the right answer more often than people expect.
• Downspout extensions. The least glamorous item on this list and frequently the whole fix. A roof puts an enormous volume of water at your foundation; moving it ten feet away solves a surprising number of wet-basement calls for a few hundred dollars.
• Dry well. A buried reservoir that holds a surge and lets it soak away slowly. Useful when there is nowhere lower to send the water, which on a flat lot is often the case.
• Regrading. Reshaping the ground so water leaves on its own. The most durable fix when the land allows it, because there is no pipe to clog and nothing to maintain.

Whatever goes in has to end somewhere legal and sensible. Discharging onto a neighbour’s property creates a dispute and sometimes a liability, and a pipe that dead-ends into clay is just a buried bucket. We identify the outlet before we price the trench.

The rule is simple and widely ignored: the ground should fall about six inches over the first ten feet away from the foundation. On a lot where mulch has been topped up year after year, or where settling has pulled the soil back toward the wall, that slope is often gone or reversed. Restoring it is frequently cheaper than any drain and fixes the problem at the source.

Final grading before sod or seed matters for the same reason. If the ground is left with dips, the lawn will hold water in exactly those spots forever, and no amount of good sod fixes a bad grade underneath it.

Most residential drainage work is one to three days. A downspout run is a morning. A single French drain across a back yard is usually one day. A full regrade with drains and new sod is three or more, and we schedule those when the ground is workable rather than the week you call, because trenching saturated clay makes a mess that takes longer to repair than the drain took to install.

NC 811 is called before every dig. Trenches are backfilled and the surface restored, and we tell you at the estimate whether sod will need replacing over the trench line, because it usually will.