Basement waterproofing cost calculator.
Build a realistic budget for interior drainage, exterior excavation, crack injection or a polyurea coating — then compare it against real quotes from local specialists.
1. Repair method
2. Basement perimeter
Tip: a 30 × 40 ft basement has a 140 ft perimeter.
3. How bad is it?
4. Add-ons
Estimated project cost
$0–$0
Planning range based on typical U.S. contractor pricing. Soil, access, depth and local labor rates move the final number — a free inspection gets you an exact quote.
Get exact quotes freeWhat drives basement waterproofing cost?
The method. Interior drain tile avoids excavation and typically runs $45–$110 per linear foot. Exterior waterproofing requires digging to the footing and usually costs $120–$300 per linear foot, before landscaping restoration.
The size of the basement. Drainage and membranes are priced by the perimeter; coatings by the square foot. A 30 × 40 ft basement has a 140 ft perimeter and about 1,200 sq ft of floor.
Access and depth. Driveways, decks, mature landscaping and deep footings all add labor. Finished basements may require removing and replacing drywall along the walls.
Severity and soil. Clay soils, high water tables and structural movement call for more drainage capacity, wall reinforcement or both.
Add-ons. Sump pumps, battery backups, dehumidifiers and gutter and grading work are often bundled into the same project.
Want the full breakdown? Read our guide to what homeowners actually pay for basement waterproofing.
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