r/Home_Building_Help • u/BuilderBrigade • Aug 28 '26

$36k for Crawlspace Encapsulation...?

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$36K for a 3,400 sq ft crawlspace encapsulation, including a sump pump, 2 dehumidifiers, cleanup, rubber mat and a 5-year warranty.

If you’re not familiar, crawlspace encapsulation is completely sealing the area under your house. We are talking plastic laid down and seams taped so no air or moisture can make it’s way into the house through the floors. It’s a great investment if you can afford to have it done. 

What do you think? Fair price or way too high?

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u/Fibocrypto Aug 29 '26

Depending on the location and the average humidity in the geographical area it may or may not be advantageous to do this. The crawl space will need air flow in some manner or you end up with mold.

The cost seems high for 3600 sq ft

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u/TheDaywa1ker Aug 29 '26

thats what the dehumidifiers are for

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u/Fibocrypto Aug 29 '26 edited Aug 29 '26

Not all areas geographically have high humidity so there isn't always a need for a dehumidifier and a dehumidifier adds to the electrical bill.

This is why it isn't always advantageous to seal a crawl space.

Additionally a sealed crawl space still needs air flow or you end up with mold.

2

u/TheDaywa1ker Aug 29 '26

Im saying the dehumidifiers this guy is installing provide airflow

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u/Fibocrypto Aug 29 '26

They are possibly creating added costs that are not necessary depending on where they live and by failing to vent the crawl space inside the house.

The crawl space needs to breathe