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The 10 Best Basement Waterproofing Companies in San Francisco (2026)
San Francisco’s older buildings, steep streets and rainy seasons mean that moisture management is a frequent concern for lower-level spaces. This list compiles the top local providers for basement waterproofing work based on Google review data, using a Bayesian-style weighting that balances average rating with review volume. The ranking was updated in 2026 to reflect current customer feedback across the Bay Area. Think of this guide as a starting point: use the ratings to narrow choices, then contact contractors directly to confirm scope, permits and guarantees for your specific property.
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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Matthew Kelly Construction
Matthew Kelly Construction tops our ranking because it combines a perfect 5.0 Google rating with a substantial review count (30), giving it strong weighted credibility in our Bayesian-style score. It is listed on Google as a Construction company and is based on Union Street in San Francisco. The blend of a flawless average and meaningful review volume is what pushes it ahead in this review-driven list.
The full ranking
Kingdom Concrete San Francisco.
Kingdom Concrete San Francisco. posts a 5.0 rating on Google based on 27 reviews and is categorized as a Concrete contractor located at 2 Sharon St in San Francisco.
27 reviews
Ultra Construction
Ultra Construction carries a 4.9 Google rating from 29 reviews and is listed as a Concrete contractor operating in South San Francisco.
29 reviews
Dryforce Water Damage & Roofing
Dryforce Water Damage & Roofing is rated 4.9 on Google with 29 reviews and appears in the Water damage restoration service category; its listed address is 427 35th Ave in San Francisco.
29 reviews
Behan Construction
Behan Construction has a 4.9 Google score from 28 reviews and is described as a Concrete contractor at 211 Genebern Way in San Francisco.
28 reviews
The Crew Concrete & Masonry
The Crew Concrete & Masonry maintains a 5.0 rating on Google across 13 reviews and shows up as a Concrete contractor with an Alemany Blvd address in San Francisco.
13 reviews
Golden City Pro
Golden City Pro holds a 4.8 Google rating based on 29 reviews and is categorized as a Water damage restoration service at 800 Haight St in San Francisco.
29 reviews
Oseguera Masonry Inc.
Oseguera Masonry Inc. is listed as a Masonry contractor with a 4.8 Google rating from 15 reviews; no street address is shown in the provided data.
15 reviews
Jim Gardner Construction Inc
Jim Gardner Construction Inc has a 4.7 Google rating from 42 reviews and is listed as a Construction company based in Oakland.
42 reviews
Universe Construction, Waterproofing and Painting
Universe Construction, Waterproofing and Painting is categorized as a Painter in Berkeley and has a 4.6 Google rating from 20 reviews at 3370 Adeline St.
20 reviews
Frequently asked questions
How should I choose a basement waterproofing contractor in San Francisco?
Start by comparing recent customer reviews and confirmed ratings, then look for contractors who clearly state their scope of work and whether they handle permits. Arrange an on-site inspection so you can get written estimates and a description of proposed methods before committing.
What should I check before hiring a waterproofing company?
Verify that the contractor carries appropriate liability insurance and any required local licenses, and ask for references or photos of completed projects. Get a detailed written contract that covers scope, timeline, materials, cleanup and any warranty or maintenance terms.
How much does basement waterproofing typically cost?
Costs vary widely depending on the size of the space, the source of water intrusion, access and whether repairs require excavation or interior-only solutions. Request multiple estimates and compare the proposed methods and materials rather than choosing solely on price.
How was this ranking created and updated?
This list is built from Google review data and uses a Bayesian-style weighting that balances average rating with the number of reviews to reduce volatility from small sample sizes. The results were refreshed for 2026 to reflect current public feedback, but you should still contact contractors directly for the latest availability and details.