Crawl space encapsulation cost in Jacksonville & Northeast Florida
Typical installed prices for encapsulation, vapor barriers, dehumidifiers, drainage and the rest of the work under a Florida house, what moves them, and a calculator to ballpark yours. They are market ranges, not our quote: the free inspection gives you the real number.
Typical prices
What each kind of crawlspace work costs
Installed prices for residential work, from cost guides published in 2026. Where a service has its own page, its name links to it.
| Service | Typical installed price | What it covers |
|---|---|---|
| Crawl space encapsulation | $3–$10 / sq ft | Liner on the floor and up the walls, vents and access door sealed, plus a dehumidifier. Most projects run $5,000–$15,000. |
| Vapor barrier | $2–$4 / sq ft | A sealed liner over the floor only. Most jobs run $1,200–$3,000; the liner itself is $0.30–$0.70 / sq ft depending on thickness. |
| Crawl space dehumidifier | $1,000–$3,000 | Installed, with a continuous drain. Running one costs about $10–$30 a month. |
| Sump pump | $650–$2,100 | Basin at the low point, pump and discharge line. A battery backup adds $600–$2,000. |
| French drain | $10–$35 / linear ft | Perforated pipe in a fabric-lined gravel trench, about $1,000–$3,500 per 100 feet. Most jobs run $2,000–$7,000. |
| Crawl space insulation | $1–$4.50 / sq ft | Batts between the joists at the low end, foam board or closed-cell spray foam at the high end. Most crawlspaces run $500–$3,700. |
| Removing old insulation | $1–$2 / sq ft | Wet, fallen or animal-soiled insulation taken out and hauled away before anything new goes in. |
| Crawl space clean-out | $500–$2,000 | Construction debris, old insulation and organic matter. Heavy jobs with animal waste and sanitizing run $1,500–$4,000. |
| Exclusion (sealing out animals) | $500–$1,500 | Wire mesh over every vent and opening, gaps sealed, access door fitted. Just a few openings run $150–$450. |
Typical ranges as of October 2026, where national cost guides agree; Northeast Florida labor runs below the national average. They are not quotes and not Firm Foundations’ price list. The free inspection and the written quote, with every solution priced on its own, give your real number.
Ballpark it
Crawl space cost calculator
Enter the size of the crawlspace, pick a vapor barrier or full encapsulation, and add what the job might need. The range updates as you go.
Roughly the footprint of the part of the house that sits over the crawlspace.
Typical range
$4,500–$15,000
- Full encapsulation, 1,500 sq ft$4,500–$15,000
A ballpark from published 2026 cost guides, not a quote and not our price list. Height, access, water and what the inspection finds all move it. The free inspection gives you the real number, with every solution priced on its own.
What moves the price
Six things that decide what your crawlspace costs
Size and height
Liner, sealing and labor scale with the square footage, and a low crawlspace where the work is done lying down takes longer than one you can kneel in.
Water comes first
Standing water means a French drain, a sump or both before anything is sealed. On river and coastal lots that can be the biggest line on the quote.
What has to come out
Construction debris, fallen insulation and animal remains are cleared before the liner goes down. A heavy clean-out is its own line.
Liner and walls
A floor-only vapor barrier costs less than a liner carried up the walls and sealed. Thicker, reinforced liners cost a little more and survive being crawled on.
Equipment
A dehumidifier is close to standard in a sealed Florida crawlspace. A sump, a battery backup and long drain or discharge lines add to it.
What the inspection finds
Rot, settled piers or cracked block are dealt with before anything is sealed, and they are priced separately, sometimes by a structural contractor.
Where you live changes the job
Four kinds of ground, four different quotes
Northeast Florida is wet in four different ways, and each one changes what goes into the job. Find your town for the specifics.
Barrier islands and the Intracoastal
On sand over a tidal water table, the usual extras are a sump where the water reaches the crawlspace floor in storm season and stainless or coated fasteners against the salt air.
St. Johns River and tidal creek lowlands
On river lowland, drainage usually comes first: a perimeter French drain and a sump sized for the volume, before the liner and dehumidifier.
Pine flatwoods and hardpan
On flatwoods ground, the liner and dehumidifier do most of the work, with grading, downspout extensions or a French drain added where water perches against the foundation.
Karst and clay uplands
On karst and clay ground, any settled piers or cracked block get assessed before anything is sealed, and that assessment can change the scope.
Cost questions
Questions about crawl space prices
Is crawl space work cheaper in Jacksonville than the national average?
Labor is. Mean hourly wages for construction laborers, insulation workers and plumbers’ helpers in the Jacksonville metro run about 11 to 16 percent below the national figures (U.S. Bureau of Labor Statistics, May 2025). What pushes a Northeast Florida job up is scope: a dehumidifier is close to standard here, and river and coastal lots often need drainage before anything is sealed.
What is included in a typical encapsulation price?
The ranges in this guide cover a light clean-up of the space, a reinforced liner on the floor and up the walls with sealed seams, sealing the vents, gaps and access door, and a crawlspace dehumidifier. Drainage, a sump, a heavy clean-out, insulation, removing old insulation and any structural repair are separate lines.
Why might my quote come in above these ranges?
Averages include plenty of small, dry, easy crawlspaces. A low or tight crawlspace, standing water, a heavy clean-out, a sump, drainage and replacing insulation all add to a job, and a good quote shows each one separately so you can see where the money goes.
Does a bigger crawlspace cost less per square foot?
Usually a little. The dehumidifier, setup and travel cost about the same for a small crawlspace as for a large one, so they are spread over more square feet. The liner and the labor still scale with the size, which is why a per-square-foot range is a better guide than one average.
Can I put down a vapor barrier myself?
In a dry, roomy crawlspace a handy homeowner can. Liner material runs about $0.30–$0.70 per square foot depending on thickness, plus seam tape. The hard parts are clearing debris first and sealing every seam and every edge at the walls and piers; a loose sheet over the dirt is not what Florida’s code describes for a sealed crawlspace.
How do I get a real number for my house?
Book the free inspection. Josh measures the crawlspace and takes photos and moisture readings, and the written quote prices each solution separately, so you can hold it up against these ranges line by line.
Each service page has its own questions, starting with what it costs, and general answers are on the FAQ page.
Get the real number on your crawlspace.
Free inspection, photos and moisture readings you keep, and a written quote with every option priced on its own.