Cost calculator
Encapsulation is a bundle, not a product — which is why two honest quotes for the same crawl space can differ threefold. Tick what each quote actually includes, and this prices the bundle line by line and gives you the installed cost per square foot to compare them on.
Planning ranges, not a quote. Standing water and combustion appliances change the job before price enters it.
Square footage drives almost every line. Height matters because the wall liner is priced off it.
Tick what the quote actually covers. This is where two “encapsulation” prices stop being comparable.
Enter the total and see where it falls against the scope you ticked above.
The band table
Four different jobs get sold under the word 'encapsulation'. Divide your quote by your crawl space square footage and find the row — this single step resolves most 'is this too high?' questions.
| Scope | Installed cost per sq ft | What that includes |
|---|---|---|
| Sealed ground cover only | $1.20-$2.50 | Liner over the soil, seams taped. No wall coverage, vents still open. This is a vapor barrier job. |
| Liner plus wall coverage | $2.50-$4.00 | Ground and stem walls lined and sealed. Vents may or may not be closed. The lower end of real encapsulation. |
| Full encapsulation with humidity control | $4.00-$7.00 | Liner, walls, vents sealed, rim air sealed, and a sized dehumidifier. The specification most people mean. |
| Encapsulation with drainage or structural work | $7.00-$12.00 | Adds interior drainage, a sump, or repairs carried in the same contract. Should always be itemised separately. |
A $9,000 quote is $6.00 per sq ft on a 1,500 sq ft crawl space — ordinary for full encapsulation. The same $9,000 on a 3,000 sq ft crawl space is $3.00, which is liner and walls without humidity control. Neither number means anything until it is divided.
Read the quote
A single total is the reason encapsulation pricing feels impossible to judge. These are the pieces a comparable quote breaks out.
Ground liner, wall liner and its termination, clear-out of the old material, vent sealing, rim joist air sealing. This is the part that is actually encapsulation, and it should be priced as a unit.
The dehumidifier, its capacity, and where the condensate drains. Size it yourself with the dehumidifier sizing calculator before accepting whatever unit is proposed.
Drainage, a sump, insulation, structural repair. All legitimate, all commonly folded into one encapsulation number, and all things you cannot compare between contractors unless they are itemised.
Sequence
Two conditions change the job itself rather than its price, and both are cheaper to find now than after the liner is down.
Related planning pages
Price the pieces separately, then judge the bundle.
Cost ranges, regional context, and what drives the price.
Learn moreWhether encapsulation is the right fix before pricing it.
Learn moreCheck the capacity your quote proposes is actually right.
Learn moreThe cheaper option, and when it is genuinely enough.
Learn moreFAQs
Short answers for homeowners using the calculator before comparing quotes.
Full encapsulation — liner, walls, sealed vents, rim air sealing and a sized dehumidifier — commonly runs about $4 to $7 per square foot installed, so roughly $6,000 to $10,500 for a 1,500 sq ft crawl space. A sealed ground cover with no wall work is a different job at $1.20 to $2.50. Always convert a quote to cost per square foot before deciding whether it is high.
Because 'encapsulation' is not a defined product. One contractor may be quoting a liner over the dirt, another a lined and sealed envelope with the vents closed and a dehumidifier installed, and a third the same plus interior drainage. Those are genuinely different jobs that can differ threefold, which is why a quote is neither high nor low until you know which bundle it describes.
As a planning guide: sealed ground cover $1.20-$2.50, liner plus wall coverage $2.50-$4.00, full encapsulation with humidity control $4.00-$7.00, and encapsulation carrying drainage or structural work $7.00-$12.00. Divide any total you are given by your crawl space square footage and see which band it lands in.
Work out the per-square-foot figure first. A quote above the range for the scope described is not automatically padded — difficult access, structural repair, or drainage folded into the same number all raise it legitimately. What matters is whether those things are itemised. A quote below the range usually means something is missing, most often the dehumidifier or the wall liner.
It should, and if it does not that is the first thing to ask about. Sealing a crawl space stops most outside moisture arriving, but a sealed space still needs active humidity control to hold 45 to 55 percent. A quote that seals the vents without providing humidity control has removed the old moisture path without adding the new one.
Both. Floor area drives the ground liner and most of the labour, while height drives the wall liner, since taller stem walls need more material and more fastening. Tight clearance works the other way and raises the price despite less material, because everything takes longer when a crew cannot move.
It should be priced, but as its own line. If water still reaches the crawl space, drainage has to happen before the space is sealed — plastic over an active water source traps it. Be wary of a single undifferentiated total that covers both; you cannot tell what you are paying for either job.
It earns its price in a humid climate with a genuine moisture, odour, or humidity problem, especially where ducts run through the crawl space. It is poor value for a crawl space that is already dry and performing, where a vapor barrier and good drainage may be all that is needed. Price the problem you actually have rather than treating encapsulation as automatic.
Watch
A 38-second version of the payback question — the cost range, the honest answer, and why the energy case alone rarely justifies the job.
How the estimate works
The savings aren't a percentage of your whole bill - they're a percentage of the part that heats and cools your home.
Roughly half of a typical home's energy goes to HVAC. The rest - appliances, water heating, lighting - encapsulation doesn't touch.
Sealing the crawl space cuts moisture load and, when ducts are down there, duct losses - so heating and cooling run a bit less.
Divide the encapsulation cost by the annual savings. For most homes that's many years - which is why energy isn't the reason to do it.
The real financial case
The number that justifies the cost isn't on your utility bill - it's the expensive damage a wet crawl space causes if you leave it.
Weigh encapsulation against those, not the energy trim. If you're still deciding, the should-you-encapsulate tool walks through whether you need it at all.
Related planning pages
These help you decide whether to encapsulate and what it will cost.
A neutral tool that says when you do and don't need it.
Learn moreThe full cost guide: planning ranges, per-square-foot bands, and what drives the price. Start here for the spend side of the payback.
Learn moreWhat a full sealed system includes.
Learn moreFAQs
Short answers for homeowners using the calculator before comparing quotes.
Yes, but modestly. Sealing and insulating a crawl space typically trims about 10 to 18 percent of heating and cooling energy - up to around 20 percent in a well-sealed, insulated crawl, per the DOE. Because heating and cooling are only about half your bill, that works out to a small share of the total in most homes.
It depends on your bill, your crawl space, and whether ducts run through it - the calculator estimates it for you. For a typical home it's often on the order of $15 to $40 a month, not the $50 to $150 some companies advertise. Homes with high bills or ductwork in the crawl space see more.
On energy savings alone it's usually long - commonly 15 years or more, and often several decades for a normal bill against a full encapsulation cost. The payback only looks fast when you also count the mold remediation and structural repairs it helps you avoid.
Usually not. The energy trim is real but small, and the payback on energy alone is long. Encapsulation earns its cost by controlling moisture, preventing mold and wood rot, protecting the structure, and improving comfort and air quality - the energy savings are a bonus on top.
Because that's the part of your bill encapsulation affects. Heating and cooling make up roughly 46 percent of a typical home's energy use, so the tool takes that slice of your bill and applies the savings rate to it, rather than to the whole bill.
Yes, quite a bit. When HVAC ducts run through an unconditioned, humid crawl space, they lose energy to it; sealing and conditioning the crawl space cuts those losses, so homes with crawl-space ductwork see larger savings. The calculator raises the estimate when you check that box.
Avoiding the expensive problems that a wet crawl space causes: mold remediation that can run $1,500 to $6,000, and structural repairs to rotted joists, sills, and subfloor that can run $2,000 to $10,000 or more - plus steadier comfort and better air quality. That's the case for doing it, not the utility bill.
No. This tool estimates the energy savings and payback side only, so you have to bring a price with you. For planning ranges - what a full system runs, what drives the number up, and the per-square-foot bands - use the crawl space encapsulation cost guide instead, then come back here to see how long those savings take to catch up.
Sources
These calculator assumptions use public cost references and crawl space building-science guidance. Results are planning ranges, not contractor quotes.
Last reviewed: August 4, 2026.