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The 10 Best Basement Waterproofing Services in Philadelphia (2026)
Philadelphia’s mix of older rowhomes and suburban properties means basements are a common part of local homeownership, and keeping them dry is a year‑round concern. This list is built from Google review data and updated for 2026, using a Bayesian score — effectively the average rating weighted by number of reviews — so businesses with both high ratings and substantial feedback rise to the top. We focused on verified Google listings in the Philadelphia area to highlight companies people are actually using, rather than relying on advertising or self-reported claims. Read on to compare ratings and review counts before you call for an inspection.
This ranking is computed from Google reviews (our method). Listings marked Partner are paid advertising spots: they sit alongside the ranking without changing its order.
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Jamison Basement Waterproofing
Jamison Basement Waterproofing earns the top spot because it pairs a perfect 5.0 Google rating with an exceptionally large review volume (1,827 reviews), giving its score strong statistical weight. Listed as a Waterproofing service in Oreland, PA, it stands out in our weighted ranking method for both high satisfaction and broad customer feedback. That combination is the primary reason it tops this 2026 list.
The full ranking
Over the Top Waterproofing
Over the Top Waterproofing carries a 5.0 rating based on 188 Google reviews and is listed as a Waterproofing service in Philadelphia.
188 reviews
Philadelphia Foundation Repair & Waterproofing
Philadelphia Foundation Repair & Waterproofing has a 5.0 Google rating from 61 reviews and appears in Philadelphia as a Waterproofing service.
61 reviews
Basement Waterproofing Scientists
Basement Waterproofing Scientists maintains a 5.0 score from 53 Google reviews and is listed as a Waterproofing service in Radnor, PA.
53 reviews
Total Basement Waterproofing & Foundation Repair Philadelphia
Total Basement Waterproofing & Foundation Repair Philadelphia holds a 5.0 rating across 43 Google reviews and is listed as a Waterproofing service in Philadelphia.
43 reviews
Dry Max Basement Waterproofing
With a 5.0 Google rating from 37 reviewers, Dry Max Basement Waterproofing is categorized as a Waterproofing service in Philadelphia.
37 reviews
Queen Foundation Repair
Queen Foundation Repair holds a 5.0 rating from 30 Google reviews and is listed in Google as a Waterproofing service.
30 reviews
MBB Basement Waterproofing
MBB Basement Waterproofing has a 5.0 Google rating based on 28 reviews and appears under Google’s Waterproofing service category.
28 reviews
A Waterproofing Solution Inc
A Waterproofing Solution Inc carries a 4.9 Google rating from 219 reviews and is listed as a Waterproofing service in King of Prussia, PA.
219 reviews
Main Line Waterproofing
Main Line Waterproofing holds a 4.9 Google rating based on 102 reviews and is listed as a Waterproofing service in Paoli, PA.
102 reviews
Frequently asked questions
How should I choose a basement waterproofing company in Philadelphia?
Start by checking recent online reviews and the number of reviewers to gauge consistency, then ask for a written inspection and estimate. Verify that the contractor provides clear scope of work, timelines, and any warranty terms before signing.
What does basement waterproofing typically involve?
Waterproofing can include interior drainage systems, sealing cracks, exterior excavation for membranes, or sump pump installation depending on the problem. A professional inspection will identify visible issues and recommend fixes tailored to your foundation and moisture source.
What should I check before hiring a waterproofing contractor?
Confirm the company is properly insured, request references or recent project photos, and get multiple written estimates to compare methods and guarantees. Also ask how they diagnose the moisture source and whether their solution addresses root causes rather than only surface symptoms.
How is this ‘best of’ ranking built and updated?
This list is generated from public Google review data and updated for 2026, using a Bayesian scoring approach that weights average rating by the number of reviews. That method favors businesses with both high ratings and substantial feedback, rather than tiny sample sizes.