Crawl space encapsulation cost calculator

Enter the crawl space area, pick basic or extensive prep, add a dehumidifier or sump pump, and enter your ZIP.

$5,000Typical 1,000 sq ft, basic

$5,500Average project (HomeAdvisor, This Old House)

50% to 70%Of the cost is labor (This Old House)

Crawl space encapsulation cost

$3,000 to $7,000

Typical $5,000 (US average)

$5.00Per sq ft, all in, typical

$3,000Low

$7,000High

Free. Your numbers become an estimate you can send from your phone.

How we got this

Basic encapsulation, installed$3.00 to $7.00 a sq ft (typical $5.00)This Old House: basic projects $3 to $7 a square foot. Midpoint as typical.
Crawl space area1,000 sq ftLow, typical and high each times 1,000.
RegionUS average prices (no ZIP entered)Enter a ZIP to scale the labor part of the price to your state's wages.
Total$3,000 to $7,000, typical $5,000

Item	Qty	Low	Typical	High
Crawl space encapsulation, basic encapsulation	1,000 sq ft	$3,000	$5,000	$7,000
Total		$3,000	$5,000	$7,000

Sources: This Old House, crawl space encapsulation cost; HomeAdvisor, crawl space encapsulation cost; Bob Vila, crawl space encapsulation cost; Fixr, sump pump installation cost; HomeAdvisor, sump pump replacement cost; Bob Vila, sump pump cost; BLS Occupational Employment and Wage Statistics, May 2025 (state and national files); US Census Bureau, 2020 ZIP Code Tabulation Area to county relationship file. Checked 2026-10-09.

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Key takeaways

Basic encapsulation costs $3 to $7 a square foot, This Old House says, and up to $10 with extensive prep.
HomeAdvisor and This Old House both put the average project at $5,500.
A dehumidifier adds $800 to $2,000 on This Old House's numbers and $800 to $1,200 on Bob Vila's.
Standing water and mold have to be dealt with first.

Encapsulation cost per square foot

This Old House puts basic projects at $3 to $7 a square foot, up to $10 for crawl spaces needing extensive work, and says labor is 50% to 70% of the total, about $2,250 to $10,500 for a 1,500 square foot home. HomeAdvisor's range is $5,000 to $15,000 per project and Bob Vila's $1,500 to $15,000.

What the job includes

Vapor barrier. A heavy liner over the floor and up the walls, taped and sealed.
Sealed vents and rim joists.
Dehumidifier. Keeps the space dry once sealed.
Drainage. A sump pump where water collects.

Repairs first

HomeAdvisor says prep like mold inspections and foundation repairs can run $150 to $15,000. Bob Vila says repairing an existing encapsulation system averages $500 to $5,000.

A worked example

A 1,000 square foot crawl space with basic prep comes to $3,000 to $7,000, about $5,000 typical, or about $6,200 with a dehumidifier. Enter a ZIP to scale the 60% labor share.

Quoting encapsulation

Photos and moisture readings. Attach them.
Square feet of floor and wall.
Dehumidifier service. Offer a yearly check on a maintenance plan.

Last checked October 9, 2026. More for your trade: how trades run on Koira.

FAQ

How much does crawl space encapsulation cost?

HomeAdvisor and This Old House put the average at $5,500. This Old House says $3 to $7 a square foot for basic jobs.

Is crawl space encapsulation worth it?

In damp areas it can stop musty smells, mold and rot under the floor.

Do I need a dehumidifier after encapsulation?

Usually. This Old House puts one with wiring at $800 to $2,000.

How much is labor for encapsulation?

This Old House says labor is 50% to 70% of the total.

How long does encapsulation take?

A few days for most crawl spaces.

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