How much does basement waterproofing cost?

Interior drainage with sump pump runs $4,000–$10,000. Exterior excavation and membrane is $10,000–$25,000. Crack injection alone is $400–$1,000 per crack.

Interior vs. exterior waterproofing - which is better?

Exterior is the textbook fix (stops water before it enters) but requires excavation around the foundation and is expensive. Interior drainage with a sump is the standard for finished basements - much cheaper and just as effective for most homes.

How long does it take?

Interior drainage in a typical basement installs in 2–4 days. Full exterior waterproofing takes 1–2 weeks because of excavation, membrane application and backfill.

Is the warranty transferable?

Look for a transferable lifetime warranty - major selling point at resale. Basement Systems, B-Dry, Groundworks and Permaseal all offer one.

Will my insurance cover this?

Standard homeowners insurance typically does not cover gradual seepage, but does cover sudden plumbing leaks. A separate flood policy is needed for ground/storm water - most basement seepage falls in between.

Updated April 2026

Best Basement Waterproofing Companiesof 2026

Reviewed: the leading basement waterproofing networks - interior drainage, exterior membrane and sump systems compared.

5Pros
compared

Vetted &
insured

Editor
verified

?Quick Answer

Groundworks is the largest US foundation and basement waterproofing network in 2026, while Basement Systems pioneered interior drainage with the WaterGuard system. Permaseal leads in the Midwest, AquaGuard in the Southeast, and B-Dry is the longest-standing brand with a 60-year-old transferable lifetime warranty.

Top pick for Basement Waterproofing

Groundworks

BEST FOR LARGEST US NETWORK

4.3(4.5k reviews)★ Trustpilot

Owns Ohio Basement Authority, Indiana Foundation Service, JES and others
Transferable lifetime warranty
Free inspection with engineering report
Available in 35+ states

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350+ dealer network

Basement Systems

BEST FOR PATENTED WATERGUARD

4.2(2.9k reviews)★ Trustpilot

Patented WaterGuard sub-floor drainage
TripleSafe sump pump system with 3 pumps
Transferable lifetime warranty
350+ certified dealers

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Chicago-area pioneer

Permaseal

BEST FOR MIDWEST LEADER

4.3(1.9k reviews)★ Trustpilot

Family-owned since 1979
Transferable lifetime warranty
Fully insured + bonded technicians
Free in-home estimate

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Atlanta-based

AquaGuard Foundation Solutions

BEST FOR SOUTHEAST SPECIALIST

4.2(1.3k reviews)★ Trustpilot

Combines waterproofing with foundation repair
Lifetime transferable warranty
Engineer-stamped designs
BBB A+ rating

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Patented since 1958

B-Dry

BEST FOR ORIGINAL PATENTED SYSTEM

4.1(1.1k reviews)★ Trustpilot

Original patented waterproofing system
Transferable lifetime warranty (60+ year history)
Independent dealer network
Track record of warranty honoring

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Basement Waterproofing Comparison Table

Side-by-side overview of every pro we reviewed.

Pro	Rating	Best For	Starting Price	Method	Warranty	Install Time
#1Groundworks	9.1/10	Largest US network	From $4,500	Interior + sump + crack injection	Transferable lifetime	2–4 days
Basement Systems	8.9/10	Patented WaterGuard	From $5,000	WaterGuard interior drain	Lifetime transferable	2–3 days
Permaseal	8.7/10	Midwest leader	From $4,800	Interior + sump	Lifetime transferable	2–4 days
AquaGuard Foundation Solutions	8.5/10	Southeast specialist	From $4,800	Interior + exterior	Lifetime transferable	2–5 days
B-Dry	8.4/10	Original patented system	From $5,200	Interior B-Dry system	Lifetime transferable	2–4 days