70 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Southold: A & A Basement Waterproofing, CR Score 58/100; 5.0★ from 128 Google reviews; open 24/7.
Best for emergencies (open 24/7): A DeLuca Basement Waterproofing, posts 24/7 hours; ranked #4 of 70.
Most-reviewed: Connecticut Basement Systems, 1,655 Google reviews at 4.8★, the most of 70 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
70 Southold foundation repair companies are ranked here by CR Score, from ten published factors. 11 are open 24/7, 51 open Saturdays and 30 open Sundays, based on posted hours. The median Google rating is 4.9★ across 70 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | A & A Basement Waterproofing | 58 | 5.0★ (128) | Cheshire Village, 38 mi away | 24/7 | Overall |
| 2 | Budget Dry Basement Waterproofing | 57 | 4.8★ (435) | Wallingford Center, 21 mi away | — | — |
| 3 | Connecticut Basement Systems | 56 | 4.8★ (1,655) | Seymour, 40 mi away | — | Most reviews |
| 4 | A DeLuca Basement Waterproofing | 55 | 4.8★ (16) | Branford, 30 mi away | 24/7 | Emergencies |
| 5 | Apollo Basement Waterproofing Queens | 54 | 5.0★ (13) | Forest Hills, 28 mi away | Sat · Sun · Evenings | — |
| 6 | Long Island Basement Waterproofing Pros | 54 | 5.0★ (15) | Amityville, 31 mi away | Sat · Sun · Evenings | — |
| 7 | Expressway Roof Leaks and Siding Repair | 54 | 4.9★ (49) | Springs, 14 mi away | 24/7 | — |
| 8 | Groundworks | 53 | 4.9★ (390) | North Haven, 31 mi away | Sat · Sun · Evenings | — |
| 9 | TPS Home Improvements | 53 | 5.0★ (10) | Hell's Kitchen, 31 mi away | Sat · Sun · Evenings | — |
| 10 | The Builders & Cleaners | 52 | 4.9★ (120) | West Haven, 32 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 128 Google reviews, listed on Google as “Waterproofing service”.
Based in Wallingford Center, 21 mi away
Ranked #2 because of its Google rating and trade focus: 4.8★ from 435 Google reviews, listed on Google as “Waterproofing service”.
Based in Seymour, 40 mi away
Ranked #3 because of its Google rating and review volume: 4.8★ from 1,655 Google reviews, the most in Southold.
Based in Branford, 30 mi away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 16 Google reviews, listed on Google as “Waterproofing service”.
Based in Forest Hills, 28 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Waterproofing service”.
Based in Amityville, 31 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based in Springs, 14 mi away
Ranked #7 because of its Google rating and review volume: 4.9★ from 49 Google reviews.
Based in North Haven, 31 mi away
Ranked #8 because of its Google rating and review volume: 4.9★ from 390 Google reviews.
Based in Hell's Kitchen, 31 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Foundation”.
Based in West Haven, 32 mi away
Ranked #10 because of its Google rating and review volume: 4.9★ from 120 Google reviews.
Based in Port Jefferson, 34 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Waterproofing service”.
Based in Coram, 26 mi away
Ranked #12 because of its Google rating and trade focus: 4.6★ from 16 Google reviews, listed on Google as “Waterproofing service”.
Based in Medford, 35 mi away
Ranked #13 because of its Google rating and review volume: 4.9★ from 126 Google reviews.
Based in Coram, 31 mi away
Ranked #14 because of its Google rating and review volume: 5.0★ from 408 Google reviews.
Based in Bayport, 26 mi away
Ranked #15 because of its Google rating and trade focus: 3.4★ from 7 Google reviews, listed on Google as “Waterproofing service”.
Based in Bristol, 35 mi away
Ranked #16 because of its Google rating and trade focus: 4.7★ from 27 Google reviews, listed on Google as “Waterproofing service”.
Based in Medford, 33 mi away
Ranked #17 because of its Google rating and review volume: 4.8★ from 601 Google reviews.
Based in Riverhead, 12 mi away
Ranked #18 because of its Google rating and review volume: 4.8★ from 60 Google reviews.
Based in Terryville, 31 mi away
Ranked #19 because of its Google rating and review volume: 5.0★ from 89 Google reviews.
Based in Maspeth, 37 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Waterproofing service”.
Based in Hamden, 35 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Waterproofing service”.
Based in Stratford, 39 mi away
Ranked #22 because of its Google rating and review volume: 4.8★ from 69 Google reviews.
Based in Far Rockaway, 27 mi away
Ranked #23 because of its Google rating and review volume: 4.9★ from 45 Google reviews.
Based in Hebron, 39 mi away
Ranked #24 because of its Google rating and review volume: 4.8★ from 60 Google reviews.
Based in West Haven, 31 mi away
Ranked #25 because of its Google rating and review volume: 4.8★ from 68 Google reviews.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 70 ranked foundation repair companies here; the rest are on their profiles.
20 more foundation repair companies within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Acme Restorations LLC | 5.0★ (1) | 25 mi |
| American Dry Basement Systems | 5.0★ (1) | 33 mi |
| Concorde Remodeling, Inc | 5.0★ (12) | In Southold |
| Doss Foundations | 5.0★ (1) | 33 mi |
| GoNano of Long Island | 5.0★ (1) | 27 mi |
| Greenewal LLC | 5.0★ (1) | 21 mi |
| HomeWork Builders Inc. | In Southold | |
| Jay Roofing and Painting | 5.0★ (1) | 32 mi |
| Lanza Waterproofing and concrete | 5.0★ (1) | 40 mi |
| LJM Foundations & Masonry, LLC | 5.0★ (2) | 35 mi |
| Maintenance Experts of Long Island | 3.0★ (2) | 40 mi |
| Morton Buildings, Inc. | 5.0★ (2) | In Southold |
| New Haven Roofing LLC | 5.0★ (1) | 38 mi |
| Norwalk Marine Contractors Inc | 5.0★ (1) | 37 mi |
| Professional Basement Waterproofing, LLC | 5.0★ (1) | 24 mi |
| QXO | 4.0★ (1) | 30 mi |
| Sligo Construction Corp. | 5.0★ (1) | In Southold |
| Superior Epoxy & Waterproofing LLC | 5.0★ (1) | 37 mi |
| Tim Gray Masonry Construction | 5.0★ (3) | In Southold |
| ValueDry Basement Waterproofing & Remodeling | 4.0★ (2) | 40 mi |
National price ranges in USD, not adjusted for Southold. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Foundation repair | $2,225 | $5,174 | $8,133 | Per project: typical range of customer-reported repairs. US national range | October 2026 |
We scored 70 Southold foundation repair companies on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Southold data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |