Basement waterproofing stops water getting into a basement and manages any that does. The right fix depends on where the water comes from: rain and runoff, cracks, or groundwater pushing up from below.
Most lasting solutions combine outside drainage fixes with an interior drain tile and sump pump, or exterior waterproofing when walls must be sealed from outside.
When you need basement waterproofing
- Water on the basement floor after rain
- Damp walls or white mineral deposits
- Musty smells or mold
- Water seeping at the joint between the wall and floor
- A sump pump that runs often or failed
What the job involves
- Find the source of the water.
- Fix gutters, downspouts and grading.
- Seal cracks or install interior drain tile and a sump pump.
- Consider exterior waterproofing for serious leaks.
- Add a dehumidifier and a battery backup for the pump.
What affects the cost
Sifixit does not quote prices, because every job is different. These are the things that move the price up or down, so you can compare quotes fairly:
- Outside drainage, interior or exterior waterproofing
- Length of drain tile around the basement
- Sump pump and battery backup
- Crack repairs
- Finished walls that must be opened
- Access around the house for exterior work
Insurance
Insurance rarely covers waterproofing, because it is maintenance. It may cover water damage from a sudden event, and sump pump failure often needs a water backup endorsement.
Licensing by state
Rules differ a lot between states. Here is who licenses this work in the states Sifixit covers most. Always ask for the license number and check it with the state.
- Texas: no state license for foundation repair. Ask for an engineer’s report on larger jobs.
- California: Contractors State License Board for most structural work.
- Florida: Construction Industry Licensing Board for structural work.
- Tennessee: state license for jobs of $25,000 or more.
- Virginia: Department of Professional and Occupational Regulation.
- Most cities require a permit for structural foundation repair.
Read our guides: basement waterproofing options and Northern Virginia older homes.
Local help for basement waterproofing
- Foundation repair in Alexandria, VA
- Foundation repair in Arlington, VA
- Foundation repair in Nashville, TN
- Foundation repair in Washington, DC
- Foundation repair in Chattanooga, TN
- Foundation repair in Dallas, TX
Quick answers: basement waterproofing
What is the best way to waterproof a basement?
Fix outside drainage first. Inside, drain tile with a sump pump is a common lasting fix.
Does waterproof paint stop leaks?
It reduces dampness but will not stop water under pressure.
Do I need a sump pump?
If groundwater collects under or around the basement, usually yes, with a battery backup.
Does insurance cover basement waterproofing?
Rarely. Water damage from a sudden event may be covered.
Who waterproofs basements?
A basement waterproofing or foundation company. Sifixit can connect you with a local provider.
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