Crawl Space Encapsulation Cost Breakdown
Line-by-line prices for vapor barriers, dehumidifiers, drainage and insulation, plus what makes quotes swing from $3,000 to $20,000.
The short answer
Angi puts a typical full encapsulation at $5,000 to $15,000, with an average near $5,500; HomeGuide gives $3,000 to $15,000, or about $3 to $10 per sq ft. A vapor-barrier-only job runs $1,000 to $3,000 (Angi) or $1,200 to $4,000 (HomeGuide). Big spaces cost more: HomeGuide lists $6,000 to $20,000 for 2,000 sq ft, and jobs with standing water, mold or structural repairs can go higher.
What each component costs
| Component | Typical installed cost | Source |
|---|---|---|
| Vapor barrier, installed | $2 to $4 / sq ft | HomeGuide |
| Barrier material only (6 to 20 mil) | $0.30 to $0.70 / sq ft | HomeGuide |
| Sealing vents and holes | $150 to $450 | HomeGuide; pro-installed vent covers $40 to $50 each (Angi) |
| Dehumidifier, installed | $1,000 to $3,000 | HomeGuide; Angi repair guide $1,500 to $3,000 |
| Rigid foam wall insulation | $1.20 to $3.70 / sq ft | HomeGuide |
| Drainage system | $800 to $3,000 | HomeGuide; interior drainage with sump $4,000 to $12,000 |
| Mold remediation | $1,500 to $4,000 | HomeGuide; Angi $1,000 to $3,500 as an add-on |
| Old insulation removal | $1 to $2 / sq ft | HomeGuide |
| Permits | $50 to $250 | Angi |
What makes quotes differ
Three things drive most of the spread: water (a dry crawl space needs no drainage), access (crews charge more when they work on their sides under 18 inches of clearance) and prep (removing old fiberglass batts, debris and moldy wood before anything new goes in). Ask every bidder to price these separately so you are comparing like with like.
Is it worth it?
Encapsulation is worth considering when you have musty odors, sagging or wet insulation, high indoor humidity, pest activity or cold floors. Its main job is keeping moisture away from floor framing. Energy savings are real but modest, so do not let a salesperson promise that the job pays for itself on utility bills alone. Budget for running costs too: HomeGuide estimates $10 to $30 a month in dehumidifier electricity.
Sources
Sources: Angi, Crawl Space Encapsulation Cost (updated Jul 10, 2026); HomeGuide, Crawl Space Encapsulation Cost (Jan 14, 2026); HomeGuide, Crawl Space Dehumidifier Cost (Dec 19, 2025); HomeGuide, Crawl Space Insulation Cost (Dec 19, 2025); HomeGuide, Sump Pump Installation Cost (Aug 26, 2023); Angi, Crawl Space Repair Cost (Oct 8, 2026). Retrieved Oct 11–13, 2026.
Prices are published US ranges from the sources listed on each page; anything we calculated ourselves is labeled as an estimate. Get at least three written, itemized local quotes. Run the estimator to build your own range.