Cost to seal a basement in Billings, MT
Updated 2026
Estimate Breakdown
Add all required items to calculate the estimated cost for the completed work.
material
Waterproof Coating/Sealant
$5.50
×
1100.00
SF
$5.50
×
1100.00
SF
$6,050.00
Surface Preparation Materials
$1.25
×
1100.00
SF
$1.25
×
1100.00
SF
$1,375.00
Pressure Washer Rental
$95.00
×
102.00
DAY
$95.00
×
102.00
DAY
$9,690.00
Dehumidifier Rental
$65.00
×
103.00
DAY
$65.00
×
103.00
DAY
$6,695.00
labor
Waterproofing Application Labor
$69.00
×
40.00
HRS
$69.00
×
40.00
HRS
$2,760.00
Surface Preparation Labor
$69.00
×
16.00
HRS
$69.00
×
16.00
HRS
$1,104.00
$27,674.00
$5,534.80
Finish Level
Project Size
SF
Contractor Markup:
%
Avg. cost in Billings, MT
$33,208.80
Avg. cost per SF:
$33.21
Contractor Markup:
$5,534.80
The cost to seal a basement ranges from $6.97/SF to $14.72/SF. This price variation depends on the type of sealant used, the condition of the basement walls, the extent of surface preparation needed, and whether crack repairs are necessary. The estimate includes waterproofing materials, surface preparation, application labor, and any necessary equipment rental.
Coating and surface preparation
The listed scope covers waterproof coating or sealant, cleaning and patching materials, surface preparation, application labor, and equipment rentals. Confirm the selected coating system and surfaces to be treated.
Cracks and existing coatings
Wall condition, crack repairs, and removal of failed coatings affect preparation time. Corners, joints, and penetrations also need to be included when defining the treated area.
Confirm what the sealing bid covers
Agree on the crack-repair work, number of coats, preparation, and drying needs. The listed package describes surface treatment; it does not define an exterior excavation or drainage-system installation scope.
