Crawl space encapsulation costs roughly $3–$9 per square foot in the Wilmington area, with about $5 typical. That figure is a sanity check rather than a quote: a 1,200 sq ft crawl space with standing water costs more in total than a dry 2,000 sq ft one.
What is inside the per-square-foot number
At the low end — around $3 — you are getting liner and vent sealing on an accessible, dry crawl space with good clearance. At the high end, around $9, the figure includes drainage, mold treatment, a dehumidifier and difficult access.
A quote materially below $3 per square foot generally means unreinforced 6 mil sheet, vents covered rather than sealed, or no conditioning.
Why area is the wrong variable
Crawl space pricing is driven far more by clearance and water than by floor area. Below roughly 24 inches of clearance, everything is done lying down and labour hours climb steeply for the same square footage.
Perimeter length also matters more than area, because termination at the walls and piers is where the labour concentrates. A long, narrow crawl space costs more than a square one of the same area.
The bottom line
Use $3–$9 per square foot to check whether a quote is in the right universe, then get a real measure. The number that matters is the scope, not the rate.
For a number against your own crawl space, use the cost estimator, or call (910) 886-2018 and we will come and measure it.