Crawl space encapsulation Cost in Arlington, Virginia
The crawl space floor and foundation walls are lined with a heavy polyethylene vapor barrier and the vents are sealed, often combined with insulation, drainage, and a dehumidifier to control moisture.
In Arlington, the expansive shrink-swell clays common around here trap moisture under the home, which crawl space encapsulation seals out. Local labor rates, your home's age, and site access then set where in the crawl space encapsulation range your job lands.
Typical figures from local cost data, not a quote. Estimate your specific job →
When crawl space encapsulation is used
Used when a vented crawl space suffers from excess moisture, mold, musty odors, pests, or high indoor humidity that threatens air quality and framing.
Lifespan: A quality 12-to-20-mil barrier typically lasts on the order of 15 to 25 years, with thicker liners containing moisture and lasting longer than thin ones.
Crawl space encapsulation costs near Arlington
Local labor rates and soil differ across the region, so the same job prices differently a short drive away. These are the closest markets we cover.
- Alexandria4 mi$3,450 to $11,450 typical
- Fairfax10 mi$3,350 to $11,150 typical
- Manassas20 mi$3,350 to $11,150 typical
Why costs differ in Arlington
Soil & geology
Arlington sits astride the fall line: the eastern third is Atlantic Coastal Plain over the Cretaceous Potomac Formation (sand interbedded with gray-to-green sandy clay), and the west is Piedmont crystalline melange that weathers to clay-rich saprolite. The Potomac Formation clay beds are locally expansive and landslide-prone, and artificial fill is mapped across about 5% of the county, so fill and shrink-swell clay are the main foundation concerns.
Permits
Structural and foundation repairs require a building permit from Arlington County's Inspection Services Division. Alterations and repairs to one- and two-family dwellings are charged about $0.16-$0.17 per square foot of affected area (or the minimum permit fee), alternatively about 0.9% of contract cost, plus a 2% state levy, a 5% automation surcharge, and a 15% indirect-cost surcharge.
Local labor
Construction labor here runs 6% below the national average (RSMeans index 0.939), which is applied to every estimate on this page.
Housing stock
The median Arlington home is about 50 years old, in Arlington County. Older homes carry more unknowns behind a foundation repair.
Where these numbers come from
Every figure on this page traces to a published source, with the date we retrieved it. The Arlington soil, permit and labor figures come from USGS Mineral Resources, Arlington County Inspection Services Division, Virginia DMAS and US Census Bureau. The national crawl space encapsulation cost range and method guidance come from This Old House and Angi. Ranges are typical costs, not a quote.
- USGS Mineral Resources (State Geologic Map Compilation)
- Arlington County Inspection Services Division (Building Fee Schedule)
- Virginia DMAS, RS Means Data (Jan-2025 RSMeans location factors): Arlington (ZIP 222) = 93.9
- US Census Bureau, ACS 2024 5-year, table B25035 (via Census Reporter)
- US Census Bureau, 2023 Gazetteer (INTPTLAT/INTPTLONG)
- This Old House
- Angi
Frequently asked questions
How much does crawl space encapsulation cost in Arlington?
In Arlington, crawl space encapsulation runs about $3–$9 per sq ft, or roughly $3,400–$11,250 for a typical job. Exact cost depends on the extent of the work. Use the calculator for an estimate specific to your home.
When is crawl space encapsulation the right fix?
Used when a vented crawl space suffers from excess moisture, mold, musty odors, pests, or high indoor humidity that threatens air quality and framing.
How long does crawl space encapsulation last?
A quality 12-to-20-mil barrier typically lasts on the order of 15 to 25 years, with thicker liners containing moisture and lasting longer than thin ones.
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