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The 10 Best Basement Waterproofing Companies in San Jose (2026)
This list is built from Google review data and updated for 2026 using a Bayesian-style score that balances average rating with review volume. We focused on businesses that appear in Google for related services and used public ratings to rank local options. In San Jose, a mix of older houses, newer developments and wet-season drainage issues means moisture control and crawlspace work come up frequently for homeowners. These entries reflect what people are saying on Google; use the list as a starting point for vetting contractors, getting written estimates, and checking licenses and warranties before you hire.
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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Attic Pros
Attic Pros tops our ranking primarily because of its combination of a very high 4.9 Google rating and a large review count (390), which gives it strong weight in our review-based method. Although listed on Google as a Pest control service, the business’s high rating and substantial number of reviews push it to number one under our scoring system. That level of reviewer volume reduces the chance that the score is skewed by a small sample.
The full ranking
GADI Construction
GADI Construction carries a 4.9 rating based on 162 reviews and is categorized as a General contractor on Cabrillo Avenue in Santa Clara. It shows strong reviewer support for its Google listing.
162 reviews
Hernandez Concrete
Hernandez Concrete holds a perfect 5.0 rating from 18 reviews and is listed as a Concrete contractor in the 95116 area of San Jose. The listing reflects a small but fully positive review sample.
18 reviews
Clean CrawlSpace Inc
Clean CrawlSpace Inc is listed as a Waterproofing service with a 4.9 rating from 27 reviews and is located near E Brokaw Road in San Jose (95112).
27 reviews
EXPERT Foundation Repair San Jose
EXPERT Foundation Repair San Jose posts a 5.0 Google rating across 12 reviews and is categorized as a Waterproofing service on W San Carlos Street in San Jose (95128).
12 reviews
Groundworks Foundation Repair San Jose
Groundworks Foundation Repair San Jose has a 4.7 rating from 334 reviews and is listed as a Concrete contractor at N Fair Oaks Avenue in Sunnyvale. Its large review count contributes heavily to its ranking weight.
334 reviews
R. Brothers Painting & Waterproofing
R. Brothers Painting & Waterproofing is recorded as a Painter with a 4.7 rating from 23 reviews and is located on W Hedding Street in San Jose (95110).
23 reviews
Golden Shield Construction INC
Golden Shield Construction INC appears as a Construction company with a 4.6 rating from 10 reviews, listed on S Almaden Boulevard in San Jose (95113).
10 reviews
Bill Brown Construction
Bill Brown Construction is listed as a Concrete contractor and carries a 4.6 rating from 11 reviews at an address on Phelan Avenue in San Jose (95112).
11 reviews
E-Mora Construction, The Crawl Space Specialists
E-Mora Construction, The Crawl Space Specialists has a 4.6 rating from 11 reviews and is categorized as a Contractor in Dublin, located on Regional Street (Dublin, 94568).
11 reviews
Frequently asked questions
How should I choose a basement waterproofing contractor in San Jose?
Start by checking licenses, insurance, and written references, then compare itemized estimates from multiple contractors. Review recent customer feedback on Google and other reputable sites, ask about warranties, and make sure the proposed solution matches the specific cause of moisture in your home.
What does basement waterproofing typically involve?
Common approaches include interior solutions like sealants, drainage channels and sump pumps, or exterior fixes such as grading, gutters, and excavation for membrane or footer repairs. The best method depends on the source of water, access around your foundation, and the severity of the problem.
How much should I expect to pay for basement waterproofing?
Costs vary widely based on the scope of work, the methods required, and site access; simple interior repairs are generally less expensive than exterior excavation or foundation work. Get several detailed, written estimates and compare what each covers, including materials, labor, and warranties.
How was this ranking built and updated?
This list uses public Google review data and a Bayesian-style score that balances average star rating with the number of reviews, helping to favor well-reviewed businesses with substantial feedback. The dataset was checked and the ranking refreshed for 2026 to reflect current Google ratings and counts.