Crawl Space Cost per Square Foot (2026)

HomeGuide's 2026 cost guide puts installed crawl space encapsulation at $3–$10 per square foot. That single band is the whole of the per-square-foot claim this site will print. A typical total in the same guide is $3,000–$15,000. Figures are published US cost ranges from HomeGuide's 2026 guide, not quotes. Your contractor's price will differ. The crawl space encapsulation cost calculator multiplies the area you type by that $3–$10 band, then adds only the optional lines you select.

The size table in the guide is the same arithmetic, written out for five areas. One thousand square feet is $3,000–$10,000. Fifteen hundred is $4,500–$15,000. Two thousand is $6,000–$20,000. Twenty-five hundred is $7,500–$25,000. Three thousand is $9,000–$30,000. If you type 1,000 and leave every extra off, including a thicker sheet, the calculator's vapour-barrier line and its sanity check are both $3,000–$10,000. That is not a promise that your 1,000 square foot space will bid at the low end. It is the published band.

The per-square-foot line is the installed job

Do not add the materials table on top of $3–$10 for a 6 mil sheet. Six mil material is published at $0.30–$0.35 per square foot, and a 1,200 square foot roll at $360–$420. Those are materials. The installed encapsulation range already prices the job. HomeGuide also says a vapour barrier with installation is about $2–$4 per square foot, and lists vapour-barrier installation at $1,200–$4,000. Using $2–$4 and $3–$10 as two charges for the same liner would double-count. This site keeps $3–$10 as the installed line and treats $2–$4 and $1,200–$4,000 as the guide's separate description of the barrier job.

Thickness does change the line once you leave 6 mil. Eight mil material is $0.35–$0.40 per square foot, 10 mil is $0.40–$0.50, 12 mil is $0.50–$0.60, and 20 mil is $0.60–$0.70. The calculator adds the gap between the selected thickness and 6 mil. On 20 mil that gap is $0.30–$0.35 per square foot. On 2,000 square feet that is $600–$700 of material difference, on top of the $6,000–$20,000 installed band. The roll prices — $420–$480, $480–$600, $600–$720, and $720–$840 for 8, 10, 12, and 20 mil — are the same materials table for a 1,200 square foot roll. They are not a second installed total.

Optional lines are not inside the $3–$10

Sealing vents and holes is $150–$450. An inspection is $100–$250. Insulation installation is $500–$3,700. The guide also notes insulation at $1.00–$4.50 per square foot; the calculator does not multiply that note, because the installation range is the line with an input. Old insulation removal is $1–$2 per square foot, so 1,500 square feet of removal is $1,500–$3,000. Drainage is $800–$3,000. A dehumidifier is $1,000–$3,500 and is not part of encapsulation until you select it. The dehumidifier guide stays on that one line.

Mould remediation is the line that breaks a per-square-foot intuition. The guide publishes $15–$30 per square foot, and also $1,500–$4,000 as a typical crawl-space job. This calculator uses $15–$30 times the area you typed. On 1,200 square feet that is $18,000–$36,000, which is larger than the encapsulation band for that area and dominates the total. The $1,500–$4,000 figure is not a ceiling. Cleaning or repairs, if required, are $500–$8,000. Minor foundation cracks are $250–$800. Major foundation repair is $4,500–$20,000. None of those three is a calculator input. If a bid cites them, the bid should name them.

Labour is the dominant share, and accessibility, clearance, and local labour rates move the price. That is why $3 and $10 can both be serious numbers for the same square footage. This site does not publish a state multiplier. A quote below the low end of the lines you selected, or above the high end, is a comparison, not a verdict. Type the quote into the calculator and read which side of the range it lands on.

Per square foot is a useful check only after the scope is the same scope. A 1,000 square foot price that includes mould remediation is not a $3–$10 job, and dividing that invoice by 1,000 will not recover the encapsulation rate. Divide only the liner line by the area, or let the calculator do the split. DIY changes the labour share, not the published materials table. The DIY comparison uses those materials figures and does not invent a weekend discount.