How to hire a basement waterproofing contractor

Start with written quotes

Get at least two or three written quotes on the same scope. A phone number or a door-to-door discount is not a substitute for a site visit and a written proposal.

Have the contractor show you where water is getting in, or how they will find out, before you agree to a system.

Ask whether the warranty covers the system, labor, and a dry basement or crawl space — and whether it transfers if you sell.

Confirm who pulls any required permit and who is responsible if the discharge point is not allowed.

Questions to ask

• Where exactly is the water coming in, and how do you know?
• What does the system include, and what is not included?
• Is the warranty transferable if I sell the house?
• Who pulls permits, if any are needed?
• Can I see proof of insurance and any required license?

Licensing, insurance and references

Ask for license and insurance details and confirm them with the issuing agency where your state or city requires them. We confirm a listed company's business name, contact details and service area before publishing; we do not inspect work, endorse contractors or publish reviews, so check references yourself.

See also what affects cost and permits and local rules, or find basement waterproofing contractors by city.

This directory lists contractors; it does not inspect homes or give engineering advice.