530 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Cos Cob: Bonded Waterproofing Solutions, CR Score 61/100; 5.0★ from 130 Google reviews; open 24/7.
Best for emergencies (open 24/7): United Waterproofing, posts 24/7 hours; ranked #2 of 530.
Most-reviewed: Connecticut Basement Systems, 1,655 Google reviews at 4.8★, the most of 530 ranked; ranked #20.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
530 Cos Cob foundation repair companies are ranked here by CR Score, from ten published factors. 140 are open 24/7, 427 open Saturdays and 326 open Sundays, based on posted hours. The median Google rating is 5.0★ across 530 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Bonded Waterproofing Solutions | 61 | 5.0★ (130) | Bergenfield, 22 mi away | 24/7 | Overall |
| 2 | United Waterproofing | 60 | 4.9★ (86) | Ridgefield, 21 mi away | 24/7 | Emergencies |
| 3 | Rain King Waterproofing | 60 | 4.6★ (29) | Rye, 5 mi away | 24/7 | — |
| 4 | Full Basement Waterproofing Westchester | 60 | 5.0★ (26) | Briarcliff Manor, 11 mi away | 24/7 | — |
| 5 | HRC Waterproofing | 59 | 4.9★ (77) | Jamaica, 27 mi away | 24/7 | — |
| 6 | ARD Waterproofing | 59 | 5.0★ (146) | Caldwell, 37 mi away | 24/7 | — |
| 7 | StrongBuild Masonry & Construction, Chimney repair, Foundation Waterproofing | 58 | 5.0★ (72) | Jersey City, 34 mi away | 24/7 | — |
| 8 | BOCCIA - Waterproofing & Masonry Specialists | 58 | 4.7★ (115) | Garden City Park, 21 mi away | Sat · Sun · Evenings | — |
| 9 | We Fix Cracks | 58 | 4.8★ (18) | Stamford, 5 mi away | Sat · Sun | — |
| 10 | Rain King Waterproofing | 57 | 5.0★ (4) | Stamford, 5 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 130 Google reviews, listed on Google as “Waterproofing service”.
Based in Ridgefield, 21 mi away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 86 Google reviews, listed on Google as “Waterproofing service”.
Based in Rye, 5 mi away
Ranked #3 because of its Google rating and trade focus: 4.6★ from 29 Google reviews, listed on Google as “Waterproofing service”.
Based in Briarcliff Manor, 11 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Waterproofing service”.
Based in Jamaica, 27 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 77 Google reviews, listed on Google as “Waterproofing service”.
Based in Caldwell, 37 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 146 Google reviews, listed on Google as “Waterproofing service”.
Based in Jersey City, 34 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 72 Google reviews, listed on Google as “Waterproofing service”.
Based in Garden City Park, 21 mi away
Ranked #8 because of its Google rating and trade focus: 4.7★ from 115 Google reviews, listed on Google as “Waterproofing service”.
Based in Stamford, 5 mi away
Ranked #9 because of its Google rating and trade focus: 4.8★ from 18 Google reviews, listed on Google as “Waterproofing service”.
Based in Stamford, 5 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Waterproofing service”.
Based in Carlstadt, 28 mi away
Ranked #11 because of its Google rating and trade focus: 4.8★ from 42 Google reviews, listed on Google as “Waterproofing service”.
Based in Albertson, 18 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 215 Google reviews, listed on Google as “Waterproofing service”.
Based in West Hills, 29 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 74 Google reviews, listed on Google as “Waterproofing service”.
Based in Melville, 18 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 69 Google reviews, listed on Google as “Waterproofing service”.
Based in Tarrytown, 13 mi away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Waterproofing service”.
Based in Hicksville, 21 mi away
Ranked #16 because of its Google rating and trade focus: 4.5★ from 23 Google reviews, listed on Google as “Waterproofing service”.
Based in Caldwell, 30 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 36 Google reviews, listed on Google as “Waterproofing service”.
Based in Greenburgh, 9 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “Waterproofing service”.
Based in New Rochelle, 19 mi away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 24 Google reviews, listed on Google as “Waterproofing service”.
Based in Seymour, 37 mi away
Ranked #20 because of its Google rating and review volume: 4.8★ from 1,655 Google reviews, the most in Cos Cob.
Based in Westbury, 19 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 93 Google reviews, listed on Google as “Roofing contractor”.
Based in Greenburgh, 7 mi away
Ranked #22 because of its Google rating and review volume: 5.0★ from 100 Google reviews.
Based in Yonkers, 16 mi away
Ranked #23 because of its Google rating and trade focus: 4.8★ from 19 Google reviews, listed on Google as “Waterproofing service”.
Based in Greenburgh, 2 mi away
Ranked #24 because of its Google rating and trade focus: 5.0★ from 12 Google reviews, listed on Google as “Waterproofing service”.
Based in Centereach, 25 mi away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 102 Google reviews, listed on Google as “Construction company”.
National price ranges in USD, not adjusted for Cos Cob. 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 530 Cos Cob 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 Cos Cob 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 |