How Much to Charge for Crawlspace Encapsulation
Crawlspace encapsulation typically runs $5–$9 per square foot for a basic 12-mil liner install and $9–$15+ per square foot for a full system with 20-mil reinforced liner, drainage, sump, and dehumidifier. Debris and old insulation removal adds $1–$3 per square foot, interior perimeter drain runs $30–$70 per linear foot, a sump pit and pump $900–$2,000, and a properly sized dehumidifier $1,200–$2,500 installed.
The working rates
- Basic encapsulation (12-mil) — $5–$9 per square foot
- Full system (20-mil, drainage, sump, dehu) — $9–$15+ per square foot
- Debris and insulation removal — $1–$3 per square foot
- Interior perimeter drain — $30–$70 per linear foot
- Sump pit and pump — $900–$2,000
- Dehumidifier installed — $1,200–$2,500
- Job minimum — $3,000–$5,000
What changes the number
- Headroom — an 18-inch crawl is a different job from a 4-foot one
- Access — hatch size determines how material gets in and debris gets out
- Standing water — drainage and sump become mandatory, not optional
- Existing conditions — mold, rot, failed piers, old fiberglass hanging down
- Liner spec — thickness, reinforcement, and termination method
- Pier count — every pier is wrapped and sealed individually
Price headroom, not just area
Square footage really does lie in this trade. A thousand square feet at four feet of headroom is a comfortable day; the same area at eighteen inches is a slow, punishing one. Use headroom bands as a multiplier and quote from a real inspection, never from a floor plan.
Quote the system, not the sheet
A liner alone in a wet crawlspace is basically a bag that holds water. Drainage, sump, and dehumidification are what actually make encapsulation work — quote them as a system so declining a component is a visible decision the customer makes in writing.
Let the photos do the pricing conversation
Nobody has seen their crawlspace. A picture of sagging fiberglass sitting in standing water justifies a five-figure number more effectively than any explanation could, and it’s why a documented bid beats a cheaper verbal one most of the time.
Frequently asked questions
Why does liner thickness change the price so much?
Because 6-mil sheeting and 20-mil reinforced liner are different products with very different lifespans, and material cost scales directly. It's also the main hidden difference between your bid and a cheaper one — state your mil thickness and let the customer ask what the other quote specifies.
How much does low headroom add?
A great deal. An 18-inch crawlspace is slow, exhausting work where every roll of liner and every bag of debris moves on someone's stomach. Price an access surcharge by headroom band rather than pretending square footage tells the whole story.
Should the dehumidifier be included in the per-square-foot rate?
No — quote it as its own line, sized to the space. It's a piece of equipment with its own warranty and a real price range, and it's also the component most likely to be value-engineered out by a customer who shouldn't be allowed to remove it silently.
What's a reasonable job minimum?
$3,000–$5,000. Mobilization, materials delivery, debris disposal, and a full crew day don't shrink much with a small crawlspace, and tiny jobs priced purely by area lose money reliably.