Crawl space waterproofing in Wilmington costs from a few hundred dollars for grading and downspout corrections to $1,500–$5,000 for a full interior perimeter drain with a sump. Most properties need some of both, and the surface work is almost always the better value.
Surface fixes first, because they are cheap
Downspouts discharging at the foundation and ground sloping back toward the house cause a large share of crawl space water, and both are inexpensive to correct. Extending downspouts six to ten feet and re-establishing fall in the first ten feet of grade frequently costs a few hundred dollars.
A contractor selling interior drainage systems has no particular reason to look at your gutters. Ask about the exterior before agreeing to the interior.
What interior drainage actually costs
A perimeter drain at footing level, bedded in washed stone, running to a sealed sump with a pump and a proper discharge, runs $1,500–$5,000 on a typical Wilmington crawl space. The variables are perimeter length and clearance — everything costs more when it is done lying down.
The bottom line
Correct the surface water first and see what is left. On a meaningful share of Cape Fear properties that is the whole fix, at a fraction of the price of an interior system.
For a number against your own crawl space, use the cost estimator, or call (910) 886-2018 and we will come and measure it.