HOW TO USE IT
How to use the Basement Waterproofing Cost Calculator
- 1
Measure the basement wall area to treat in square feet.
- 2
Choose the treatment (interior or exterior) and its price per sq ft.
- 3
Enter labor per sq ft (prep, drainage) and review the total.
THE MATH
Basement waterproofing formula
Total cost = wall area × (treatment + labor)Basement waterproofing is priced per square foot of wall and includes the treatment (coating, membrane, drainage board) plus labor: drying, surface prep and drainage installation when needed.
PRACTICAL EXAMPLE
A basement with 800 sq ft of walls
800 sq ft × ($5/sq ft treatment + $4/sq ft labor) = $7,200.
FAQ
Frequently asked questions
How much does basement waterproofing cost?
Interior runs $3-$8 per sq ft of wall; exterior $5-$12. Most basements cost $5,000-$15,000.
Interior or exterior waterproofing?
Interior is cheaper and handles most seepage; exterior is more effective against hydrostatic pressure but requires excavating around the foundation.
Do I need a drain system?
Often yes — if water pools around the foundation, an interior French drain or exterior drainage keeps the waterproofing effective long-term.