How much does crawl space encapsulation cost in Charleston, SC?
Short answer: most full crawl space encapsulations land in the mid-four to low-five figures. A Charleston installer publishes $4,500–$12,000 for full encapsulation (Fortress Moisture Seal Charleston, crawl space encapsulation page), and Angi's 2026 national average is $5,500, with most homeowners paying $5,000–$15,000 (Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026)). A ground vapor barrier alone costs far less.
Charleston prices published by local installers
| Item | Published range | Source |
|---|---|---|
| Full encapsulation | $4,500–$12,000 | Fortress Moisture Seal Charleston, crawl space encapsulation page |
| 10 mil vapor barrier, installed, seams taped | $0.70 per sq ft | Coastal Crawlspaces (Charleston installer), published price list |
| 14 mil reinforced vapor barrier | $1.00 per sq ft | Coastal Crawlspaces (Charleston installer), published price list |
| 20 mil vapor barrier | $1.40 per sq ft | Coastal Crawlspaces (Charleston installer), published price list |
| Wall liner (encapsulation) | $5 per linear ft | Coastal Crawlspaces (Charleston installer), published price list |
| Pier wraps | $45 each | Coastal Crawlspaces (Charleston installer), published price list |
| Interior French drain | $55 per linear ft | Coastal Crawlspaces (Charleston installer), published price list |
Worked example from Coastal Crawlspaces' own page, for a 1,500 sq ft crawl space: a 14 mil barrier (about $1,500) plus 140 linear ft of wall liner ($700) and 12 pier wraps ($540) comes to about $2,740 before any cleanout or dehumidifier (Coastal Crawlspaces (Charleston installer), published price list).
National benchmarks
| Item | Published range | Source |
|---|---|---|
| Average encapsulation | $5,500 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
| Typical range | $5,000–$15,000 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
| Typical range | $3,000–$15,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| Per sq ft, basic | $2–$4 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
| Per sq ft, with cleaning and repairs | $3–$10 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
Cost by crawl space size
| Item | Published range | Source |
|---|---|---|
| 1,000 sq ft | $3,000–$10,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| 1,500 sq ft | $4,500–$15,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| 2,000 sq ft | $6,000–$20,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| 2,500 sq ft | $7,500–$25,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| 3,000 sq ft | $9,000–$30,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
Add-ons and repairs
| Item | Published range | Source |
|---|---|---|
| Dehumidifier, installed | $1,000–$3,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| Interior drain incl. pump | $800–$3,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| Insulation | $500–$3,700 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| Sealing vents and holes | $150–$450 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| Mold remediation (crawl space) | $1,500–$4,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
| Sealing cracks | $200–$1,000 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
| Water damage | $1,000–$10,000 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
| Structural repairs | $1,500–$16,000 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
| Permits, where required | $50–$250 | Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026) |
What moves the price
- Size and height. Total cost scales with square footage, and tight, low crawl spaces take longer to work in.
- Condition. Standing water, mold, rot or pests must be fixed first and can add thousands.
- Liner thickness and coverage. Floor-only vs. walls and piers, and 10 vs. 20 mil.
- Humidity control and drainage. A dehumidifier and sump pump are the biggest add-ons.
- Warranty. Longer, transferable warranties usually come with higher quotes.
How to compare quotes
Line quotes up item by item: liner thickness and coverage, vent sealing, drainage, dehumidifier model and size, mold or wood repair, permits and warranty. A low quote that leaves out drainage or a dehumidifier isn't the same job.
Questions
How much does it cost to encapsulate a 1,500 sq ft crawl space?
HomeGuide puts a 1,500 sq ft crawl space at $4,500–$15,000 installed (HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026)). A ground barrier alone on 1,500 sq ft is about $1,050–$2,100 at one Charleston installer's posted rates (Coastal Crawlspaces (Charleston installer), published price list).
Is crawl space encapsulation worth it?
It's usually worth pricing if you have moisture symptoms: musty smells, damp or falling insulation, mold or soft floors. Get a written quote that shows what's included and compare it with a basic vapor barrier.
Why are Charleston quotes so different?
Quotes often differ in what's included: liner thickness and coverage, drainage, the dehumidifier and repairs. A loose liner over the dirt isn't the same job as a sealed system (Fortress Moisture Seal Charleston, crawl space encapsulation page).
Sources
All pages accessed November 2, 2026. Published prices change and are not a quote for your project; your written quote is what counts.
- Angi, How Much Does Crawl Space Encapsulation Cost? (updated Oct 28, 2026): https://www.angi.com/articles/how-much-does-crawl-space-encapsulation-cost.htm. National average $5,500; most $5,000–$15,000; $2–$4/sq ft basic, $3–$10/sq ft extensive; repair, material and permit ranges.
- HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026): https://homeguide.com/costs/crawl-space-encapsulation-cost. $3–$10/sq ft, $3,000–$15,000 total; cost by size; component costs (vapor barrier, insulation, dehumidifier, drainage, mold).
- Coastal Crawlspaces (Charleston installer), published price list: https://coastalcrawlspaces.net/. Charleston installer's posted prices: 10/14/20 mil vapor barrier $0.70/$1.00/$1.40 per sq ft installed, wall liner $5/linear ft, pier wraps $45, interior French drain $55/linear ft.
- Fortress Moisture Seal Charleston, crawl space encapsulation page: https://fortressmoistureseal-charleston.com/services/crawl-space-encapsulation/. Charleston pricing stated as $4,500–$12,000 for full encapsulation.
- South Carolina Department of Labor, Licensing and Regulation (LLR): https://llr.sc.gov/. State agency for contractor and residential builder licensing; license lookups.
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