Crawl Space Encapsulation Cost Calculator
Estimated Encapsulation Cost
$5,500 – $11,000
$5.50 – $11.00 per sq ft
Total Cost
$5,500 – $11,000
Cost per Sq Ft
$5.50 – $11.00
Area
1,000 sq ft
Tip: Crawl space encapsulation can reduce energy bills by 15–20% and prevent costly structural damage from moisture. It also qualifies for some home energy efficiency rebates.
Disclaimer: Estimates are for budgeting purposes only. Actual costs vary by location, contractor, material availability, and project complexity. Always get professional quotes for exact pricing.
Crawl Space Encapsulation Cost Breakdown
| Encapsulation Type | Cost per Sq Ft | 1,000 Sq Ft Home |
|---|---|---|
| Vapor Barrier Only | $2.00 – $5.00 | $2,000 – $5,000 |
| Full Encapsulation | $5.00 – $10.00 | $5,000 – $10,000 |
| Full + Dehumidifier | $7.00 – $14.00 | $7,000 – $14,000 |
* Costs shown for damp condition (1.1× multiplier). Standing water conditions add 50%.
How We Calculate
Our crawl space encapsulation cost calculator estimates project costs based on crawl space area, encapsulation type, and moisture condition. Pricing is calculated per square foot with multipliers for moisture severity.
How the math works: Total cost = area (sq ft) × base cost per sq ft (by encapsulation level) × moisture condition multiplier. A contractor minimum of $1,500 applies for small spaces.
Encapsulation Levels
Vapor barrier only ($2–$5/sq ft) covers the floor with 6–20 mil polyethylene sheeting. Full encapsulation ($5–$10/sq ft) seals floor, walls, and piers with heavy-duty liner, drainage matting, and sealed vents. Full + dehumidifier ($7–$14/sq ft) adds a commercial-grade dehumidifier for active moisture control.
Moisture Condition Impact
Dry crawl spaces (preventive encapsulation) are the baseline cost. Damp conditions add 10% for additional moisture barriers. Wet conditions add 25% for drainage improvements. Standing water adds 50% and typically requires sump pump installation first.
Additional Costs
Common add-ons include: sump pump installation ($800–$2,500), French drain ($1,500–$4,000), mold remediation ($1,500–$5,000), insulation ($1.50–$3.50/sq ft), and structural repairs ($2,000–$10,000+).
Data Sources
Pricing data is compiled from HomeAdvisor, Angi, HomeGuide, and crawl space specialists across multiple US regions (2025–2026). Costs vary significantly by region, accessibility, and existing conditions.
Last updated: 2026-02-08
Frequently Asked Questions
How much does crawl space encapsulation cost? +
Crawl space encapsulation costs $5,000–$15,000 for an average home (1,000 sq ft). A basic vapor barrier runs $2,000–$5,000, full encapsulation $5,000–$10,000, and full encapsulation with a dehumidifier $7,000–$14,000. Costs increase with moisture severity and crawl space size.
Is crawl space encapsulation worth the cost? +
Yes, encapsulation typically pays for itself in 3–5 years through 15–20% energy savings, prevented structural damage, and improved indoor air quality. Up to 40% of indoor air comes from the crawl space, so moisture control directly affects your living space.
What is the difference between a vapor barrier and full encapsulation? +
A vapor barrier (6–20 mil plastic) covers only the crawl space floor and costs $2–$5/sq ft. Full encapsulation seals the floor, walls, piers, and vents with heavy-duty liner (12–20 mil), adds drainage matting, and may include a dehumidifier — costing $5–$14/sq ft.
How long does crawl space encapsulation last? +
A professionally installed encapsulation system lasts 15–25 years. The vapor barrier itself can last 20+ years, while dehumidifiers typically need replacement every 8–12 years. Annual inspections ($100–$200) help catch issues early.
Do I need a dehumidifier with encapsulation? +
In most climates, yes. Even with full encapsulation, residual moisture from concrete walls and seasonal humidity can accumulate. A crawl space dehumidifier maintains humidity below 55%, preventing mold growth. Homes in arid climates may not need one.
Can I encapsulate my crawl space myself? +
DIY vapor barrier installation is possible ($500–$1,500 in materials) but not recommended for full encapsulation. Professional installation ensures proper sealing around piers, ductwork, and pipes, and includes warranty coverage. Improper installation can trap moisture and worsen problems.
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