Basement Waterproofing · Costs, budgets and timelines · Updated November 2026
Crawl Space Encapsulation Cost
Crawl space encapsulation seals the floor, walls and vents of a crawl space to control moisture. HomeAdvisor puts the average at about $15,750, with costs of $2–$10 per square foot.
Costs
| Item | Typical cost |
|---|---|
| Full encapsulation | $2–$10 per sq. ft. (about $15,750 average) |
| Vapor barrier only, installed | $2–$4 per sq. ft. ($1,200–$4,000 total) |
| Sealing vents | $150–$450 |
| Dehumidifier, installed | $800–$2,000 |
| Sump pump, if water collects | $1,200–$2,500 |
Encapsulation, barrier and vents from HomeAdvisor; dehumidifier and sump pump from our basement waterproofing cost guide.
What encapsulation usually includes
- Cleaning out debris.
- A heavy-duty liner over the floor and up the walls, with seams taped.
- Sealing vents and the rim joist area.
- A dehumidifier or conditioned air to control humidity.
- Drainage and a sump pump where water enters.
Fix these first
Encapsulation will not solve standing water or leaks. Address grading, gutters and plumbing leaks first, and have any mold or wood damage evaluated. See crawl space moisture causes and options and vapor barrier vs. encapsulation.
Sources
- HomeAdvisor: Crawl space encapsulation cost, accessed November 2026
Cost figures are national ranges from the sources listed above and in our basement waterproofing cost guide, not a quote from FixFinch or any contractor.