How Much Does Crawl Space Encapsulation Cost? (2024)

By Amanda Lutz Updated January 9, 2024

Typical costs range from $1,500 to $15,000.

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A crawl space encapsulation installation costs $8,250 on average but can run you between $1,500 and $15,000, depending on the project. Encapsulation is a form of crawl space or basement waterproofing that keeps moisture and humid air from entering your house and compromising your foundation and air quality. Read our guide to learn more about the cost factors of crawl space encapsulation.


Note: Cost data in this article was sourced from Angi, HomeAdvisor, and Fixr.


Crawl Space Encapsulation Major Cost Factors

The main factors determining this project’s cost include crawl space size, crawl space condition, and the materials required for waterproofing.

Size of Crawl Space

Larger crawl spaces require more materials and labor to fully encapsulate. The larger the surface area that needs waterproofing, the more you’ll pay.

Cost by Size

Depending on the project, you may pay anywhere from $2 to $10 per square foot. Here’s a cost breakdown by square footage:

Size in Sq. Ft.Cost Range













Features and Materials

An encapsulation system requires a variety of materials depending on your crawl space’s moisture levels. Low humidity levels may only require the installation of thin plastic moisture barriers, while more substantial issues could call for a new drainage system. Here are some of the most common materials necessary to complete a project:

Cost by Features and Materials

Here’s how these encapsulation materials break down by price:

MaterialCost Range

Vapor barrier

$0.50–$0.70 per sq. ft.


$0.60–$4.50 per sq. ft.

Vent covers

$15–$22 each

Bond tape

$50 per roll

Ductwork (incl. installation)


Sump pump (incl. installation)


Dehumidifier (incl. installation)


Condition of Crawl Space

Your project will cost more if your crawl space has suffered water damage or needs repairs. Neglected crawl spaces may require the following services that come with additional costs:

Cost by Condition

Here’s how much you can expect to pay for the above services:

ServiceCost Range

Termite control


Pest control


Radon mitigation


Mold remediation


Exterior french drain


Foundation repair


Interior french drain


Joist replacement


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How to Estimate the Total Cost of Your Crawl Space Encapsulation Project

To approximate crawl space encapsulation cost, measure the dimensions of your crawl space and multiply your findings by $2 and then by $10. The lower end of that range is likely to get you a thin vapor barrier and some basic insulation and ventilation. The high end of that range will likely cover vapor barriers, drainage, spray foam insulation, and thorough dehumidification.

Many crawl space and waterproofing contractors offer free inspections and estimates if you want a better idea of what you need and what it will cost. If you suspect you have foundation damage, you may want to hire an independent structural engineer—an expert who doesn’t do repairs—to provide an unbiased report.



Professional vs. DIY Crawl Space Encapsulation

Some facets of an encapsulation project are DIY-friendly, but we recommend hiring waterproofing professionals for the heavy-duty work.

Professional Crawl Space Encapsulation 

Hiring professional contractors means paying more, but contractors know the permits, equipment, and materials that are necessary to complete your encapsulation project. Some manufacturers’ warranties require professional installation of the waterproofing system for the warranty to be in effect, and many contractors offer workmanship warranties of their own. If the stability of your home’s foundation is at all in question, hiring a pro is essential.

DIY Crawl Space Encapsulation

If you want to get a head start on the project, clean the crawl space and remove water-damaged materials. You can also take on some of the finishing tasks, such as applying waterproof paint. You may save money by purchasing heavy-duty waterproofing materials ahead of time for the contractor to use.



How to Reduce Crawl Space Encapsulation Costs

You can save on the project’s total cost with the following tips:



How to Hire a Professional

When comparing waterproofing contractors, here are some things to keep in mind:



Our Recommendation

Most homeowners find that this waterproofing job is worth the cost to protect their home’s foundation from water, mold, and pests. It is ultimately less expensive than fixing a severely damaged foundation. Insulating this space also increases your home’s energy efficiency by reducing heating and cooling costs, so crawl space encapsulation is a good choice for homeowners who live in damp or extreme climates.

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Crawl Space Encapsulation FAQ

What is crawl space encapsulation and why is it important?

Encapsulating a crawl space means lining it with plastic sheeting to make it as waterproof as possible. This protects the crawl space from water damage, mold, mildew, and pest infestations.

How does crawl space encapsulation improve air quality and energy efficiency?

Crawl space encapsulation seals out air leaks and prevents respiratory health hazards by eliminating the buildup of mold. Encapsulation also includes insulation, which helps regulate your homeu0026#8217;s temperature and prevents your HVAC system from overworking.

How does crawl space encapsulation prevent mold, mildew, and pests?

Encapsulating the crawl space seals it off and ventilates it. This means humidity won’t build up and standing water will be pumped away. Consequently, mold and pests are less likely to make their homes there.

How does crawl space encapsulation protect the foundation and structure of the home?

A crawl space encapsulation project includes improving drainage in and around the home’s foundation, which helps protect it from erosion, hydrostatic pressure, soil shifting, and other damaging phenomena. The crawl space walls are less likely to bow or develop cracks, and the home will remain properly supported.

How long does crawl space encapsulation last and what kind of warranty is available?

Most waterproofing contractors offer 15- to 20-year warranties on crawl space encapsulation jobs. In the absence of catastrophic events, the encapsulation is likely to last 20 years or more.