How Much Does Crawl Space Encapsulation Cost in Washington?
Washington pricing is above the national average. Updated for 2026.
Crawl Space Encapsulation Pricing in Washington
In Washington, the average cost for crawl space encapsulation is $7,475 per project, which is 15% higher than the national average of $6,500. Most Washington residents pay between $3,450 and $13,800.
Washington has a higher cost of living than most states, which translates to higher labor rates and material costs. Urban areas within Washington may be even higher.
Crawl space encapsulation seals your home's crawl space with heavy-duty moisture barriers on the floor, walls, and sometimes ceiling. Combined with a dehumidifier, it prevents moisture damage, mold growth, pest intrusion, and improves indoor air quality.
Washington vs National Average
What Affects Crawl Space Encapsulation Cost in Washington?
Crawl Space Size
Small (500 sq ft): $2,500-$5,000. Average (1,000 sq ft): $5,000-$8,000. Large (1,500+ sq ft): $8,000-$15,000
Scope
Floor only: $2,000-$4,000. Full encapsulation (floor + walls + sealed vents): $5,000-$12,000
Dehumidifier
Commercial-grade crawl space dehumidifier adds $1,000-$2,500 installed
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💡 Tips to Save on Crawl Space Encapsulation in Washington
- 1.Address water intrusion first — fixing grading or gutters may reduce the scope
- 2.A basic vapor barrier (6-12 mil) on the floor only costs $1,500-$3,000 and handles most moisture issues
- 3.Get quotes from waterproofing specialists, not general contractors
- 4.Check for energy efficiency rebates — some utilities offer them
📈 Crawl Space Encapsulation in Washington Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $6,349 | — |
| 2021 | $6,616 | +4.2% |
| 2022 | $7,046 | +6.5% |
| 2023 | $7,243 | +2.8% |
| 2024 | $7,475 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for Crawl Space Encapsulation in Washington
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Frequently Asked Questions
Is crawl space encapsulation worth the money?
Yes, especially if you have moisture problems. It prevents $10,000-$30,000+ in potential structural and mold damage, reduces energy bills 15-20%, and can increase home value by 5-10%.
How long does crawl space encapsulation last?
A properly installed encapsulation with 20-mil vapor barrier should last 20+ years. Dehumidifiers need maintenance and eventual replacement (8-12 years).
Crawl Space Encapsulation Cost in Other States
Related Cost Guides for Washington
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