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The 10 Best Basement Waterproofing Companies in San Diego (2026)
San Diego homeowners face moisture and foundation concerns driven by coastal humidity, varied terrain, and occasional heavy rains. This list ranks the 10 Best Basement Waterproofing Companies in San Diego using Google ratings updated for 2026; our methodology applies a Bayesian-style score (the average rating weighted by review count) so businesses with strong reputations and sufficient volume rise to the top. We pulled live Google data to reflect current customer feedback across the county, then organized results by score. Read on for options across San Diego County, from downtown neighborhoods to North County and El Cajon, plus practical FAQs on hiring and timing.
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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Groundworks Foundation Repair San Diego
Groundworks Foundation Repair San Diego takes the top spot with a perfect 5.0 Google rating across 60 reviews, combining excellent scores with meaningful review volume. Categorized as a Concrete contractor and based in San Marcos, it benefits in our Bayesian weighting by pairing high marks with a sizeable number of customer ratings. Several other firms also show top scores, but Groundworks’ balance of rating and reviews places it ahead in this ranking.
The full ranking
Ground Up Construction Management Inc.
Ground Up Construction Management Inc. holds a 5.0 rating on Google from 59 reviews and is categorized as a Contractor located in San Diego.
59 reviews
Mighty Dry San Diego
Mighty Dry San Diego carries a 4.9 Google rating based on 684 reviews and appears as a Water damage restoration service with a San Diego address.
684 reviews
QUALITY Foundation Repair San Diego
QUALITY Foundation Repair San Diego is a Concrete contractor rated 5.0 on Google from 31 reviews; the business is listed in San Diego.
31 reviews
EZ DRY
EZ DRY shows a 4.9 Google rating across 63 reviews and is classified as a Water damage restoration service with a San Diego address.
63 reviews
Better Foundation Repair
Better Foundation Repair has a 5.0 Google rating from 26 reviews and is listed under the Concrete contractor category; no street address is provided in the Google listing.
26 reviews
MASTER Concrete Contractors San Diego
MASTER Concrete Contractors San Diego appears as a Concrete contractor with a perfect 5.0 rating based on 19 Google reviews and is shown in San Diego.
19 reviews
Ram Jack Pacific
Ram Jack Pacific is listed as a Contractor with a 4.8 Google rating from 114 reviews and has an address in El Cajon.
114 reviews
San Diego Footing Repair, Inc.
San Diego Footing Repair, Inc. holds a 5.0 Google rating from 12 reviews, is categorized as a Contractor, and is listed with an El Cajon address.
12 reviews
Waterproofing Contractor San Diego. Deck. Concrete Coating
Waterproofing Contractor San Diego. Deck. Concrete Coating is a Waterproofing service rated 5.0 on Google with 10 reviews and is shown with a San Diego address.
10 reviews
Frequently asked questions
How should I choose a basement waterproofing company in San Diego?
Look at verified customer reviews, the company’s history of similar projects, and whether they offer clear, written assessments. Compare multiple estimates and ask for details about materials, timelines, and warranties before making a decision.
What factors influence the cost of basement waterproofing?
Cost depends on the scope of work, materials used, accessibility, and whether the issue is surface-level moisture or structural foundation work. Request itemized estimates and make sure the contractor explains which problems are being addressed and why.
What should I check before hiring a waterproofing or foundation contractor?
Confirm licensing and insurance, ask for references or recent project photos, and verify written warranties or guarantees. Also check for clear scopes of work, permit handling if required, and a timeline that fits your needs.
How was this ranking of basement waterproofing companies built?
This list is derived from current Google review data and uses a Bayesian-style score—the average rating weighted by the number of reviews—so businesses with strong ratings and substantive feedback rank higher. The dataset was updated for 2026 to reflect recent customer ratings across San Diego County.