Updated 2026-07-21 · Published 2026-07-15
Crawl space vapor barrier cost (installed)
A ground vapor barrier (liner over the soil) is the leanest moisture-control assembly MoistureCost prices. These figures are professional installed planning ranges from model version 1.0.0—not the price of a polyethylene roll on a retail product page. A vapor barrier is not encapsulation.
A crawl-space ground vapor barrier typically costs $2,550–$7,400 installed for planning purposes, with a typical 1,200 sq ft project around $4,300 ($3.59/sq ft) based on MoistureCost model 1.0.0. This is professional installed cost—not an Amazon liner roll price—and it is not encapsulation.
Low
$2,550
Typical
$4,300
High
$7,400
Installed planning ranges from the live cost model. Materials-only retail kits are a different product.
Installed planning cost ≠ buy-liner-online price
Search results for “crawl space vapor barrier cost” often mix three different intents: (1) buy a liner product or DIY kit, (2) hire a contractor for ground-liner installation, and (3) full encapsulation marketing that mislabels a liner as “encapsulation.” MoistureCost answers intent (2): installed planning cost for a ground vapor barrier scope.
A product PDP or marketplace listing shows materials only. Installed work adds crawl labor, seam detailing, access difficulty, disposal, mobilization, and often pier wraps if specified. Do not treat a $200–$800 retail liner kit as comparable to a contractor vapor-barrier quote—or to encapsulation.
What a vapor barrier project usually includes
Reinforced polyethylene or similar liner over exposed soil, seam detailing, and labor to install in the crawl. Pier wraps, debris removal, and insulation removal are optional add-ons—not automatic inclusions.
Wall liner, vent sealing, and dehumidifiers belong to sealed-crawl or full-encapsulation scopes. If a quote bundles those under “vapor barrier,” ask for a corrected scope label.
Planning ranges by size (Ohio baseline)
These low / typical / high totals assume single-family, average access, 36″ clearance, dry or seasonally damp conditions, and a ground-vapor-barrier-only scope in Ohio. Display totals round to the nearest $50.
When a liner alone may be incomplete
If outdoor air, wall moisture, or chronic humidity is the issue, sealed crawl or full encapsulation may be discussed after inspection. MoistureCost prices the work you select; it does not diagnose the correct moisture solution.
Standing water, structural damage, pests, and mold need separate evaluation. Those costs are excluded from core vapor-barrier totals.
Cost vs encapsulation at the same size
For the same footprint, moving from ground barrier to sealed crawl or full encapsulation adds wall work, sealing, and often equipment. Use the comparison table on the encapsulation-vs-vapor-barrier page, or run all three scopes in the calculator with identical size and state inputs.
Questions to ask before buying liner-only work
What mil thickness and reinforcement grade are specified? How are seams and piers detailed? Is the crawl dry enough for liner-only work? Will vents remain open? Who owns cleanup and disposal? Get answers in writing before comparing prices—and keep DIY material receipts separate from installed bid comparisons.
| Example | Low | Typical | High | Typical $/sq ft |
|---|---|---|---|---|
| 500 sq ft ground vapor barrier (OH) | $1,800 | $3,050 | $5,400 | $6.12 |
| 1,000 sq ft ground vapor barrier (OH) | $2,350 | $3,950 | $6,800 | $3.95 |
| 1,500 sq ft ground vapor barrier (OH) | $2,900 | $4,850 | $8,250 | $3.23 |
| 2,000 sq ft ground vapor barrier (OH) | $3,500 | $5,750 | $9,650 | $2.87 |
Totals rounded to the nearest $50 per MoistureCost display policy. Model version 1.0.0. Planning ranges only — not contractor bids.
| Example | Low | Typical | High | Typical $/sq ft |
|---|---|---|---|---|
| Ground vapor barrier | $2,550 | $4,300 | $7,400 | $3.59 |
| Sealed crawl space | $3,900 | $6,500 | $11,000 | $5.42 |
| Full encapsulation | $5,350 | $8,850 | $14,750 | $7.37 |
Totals rounded to the nearest $50 per MoistureCost display policy. Model version 1.0.0. Planning ranges only — not contractor bids.
FAQ
Does vapor barrier cost include a dehumidifier?
No. Dehumidifiers are part of full encapsulation or an explicit add-on—not part of a ground-barrier-only scope in this model.
Why are MoistureCost numbers higher than Amazon liner prices?
Because this page prices installed professional work (labor, detailing, project overheads), not a roll of plastic shipped to your door. Materials-only shopping belongs on product pages; planning a contractor scope belongs here.
Can I DIY a vapor barrier?
Some accessible, dry crawls may be within skilled DIYer reach for materials installation, but safety, code, and detailing still matter. See the DIY vs professional guide. The calculator models professional planning costs.
Before relying on any cost figure, read our methodology and disclaimer.
Sources
- Crawl-space vapor barrier product guidance (manufacturer technical literature) — Manufacturer technical literature + EPA moisture-control context (accessed 2026-07-01)
- HomeAdvisor / Angi cost guides — crawl space encapsulation & vapor barrier ranges — Angi (and cross-checked publisher cost guides) (accessed 2026-07-01)
- Gordian RSMeans construction cost data — assemblies & labor (industry reference class) — Gordian (RSMeans) (accessed 2026-07-01)