75 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Riverhead: A & A Basement Waterproofing, CR Score 58/100; 5.0★ from 128 Google reviews; open 24/7.
Best for emergencies (open 24/7): Pappy's Ultimate Construction, Drainage & Waterproofing, posts 24/7 hours; ranked #6 of 75.
Most-reviewed: Connecticut Basement Systems, 1,655 Google reviews at 4.8★, the most of 75 ranked; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
75 Riverhead foundation repair companies are ranked here by CR Score, from ten published factors. 14 are open 24/7, 56 open Saturdays and 34 open Sundays, based on posted hours. The median Google rating is 4.9★ across 75 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 | Chris Landscaping & Basement Waterproofing corp | 58 | 5.0★ (74) | West Hills, 26 mi away | Sat · Sun | — |
| 3 | Connecticut Basement Systems | 56 | 4.8★ (1,655) | Seymour, 39 mi away | — | Most reviews |
| 4 | Apollo Basement Waterproofing Queens | 56 | 5.0★ (13) | Forest Hills, 13 mi away | Sat · Sun · Evenings | — |
| 5 | Long Island Basement Waterproofing Pros | 56 | 5.0★ (15) | Amityville, 16 mi away | Sat · Sun · Evenings | — |
| 6 | Pappy's Ultimate Construction, Drainage & Waterproofing | 56 | 5.0★ (102) | Centereach, 26 mi away | 24/7 | Emergencies |
| 7 | Budget Dry Basement Waterproofing | 56 | 4.8★ (435) | Wallingford Center, 30 mi away | — | — |
| 8 | A DeLuca Basement Waterproofing | 56 | 4.8★ (16) | Branford, 29 mi away | 24/7 | — |
| 9 | TPS Home Improvements | 56 | 5.0★ (10) | Hell's Kitchen, 16 mi away | Sat · Sun · Evenings | — |
| 10 | Foundation Crack Repair LLC | Basement Crack Repair | Basement Waterproofing | French Drains | 55 | 5.0★ (15) | Sayville, 25 mi away | Sat · Sun | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 128 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in West Hills, 26 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 74 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Seymour, 39 mi away
Ranked #3 because of its Google rating and review volume: 4.8★ from 1,655 Google reviews, the most in Riverhead.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Forest Hills, 13 mi away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 13 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Amityville, 16 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Centereach, 26 mi away
Ranked #6 because of its Google rating and trade focus: 5.0★ from 102 Google reviews, listed on Google as “Construction company”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wallingford Center, 30 mi away
Ranked #7 because of its Google rating and trade focus: 4.8★ from 435 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Branford, 29 mi away
Ranked #8 because of its Google rating and trade focus: 4.8★ from 16 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hell's Kitchen, 16 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Foundation”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Sayville, 25 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bayport, 10 mi away
Ranked #11 because of its Google rating and trade focus: 3.4★ from 7 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Port Jefferson, 21 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Medford, 20 mi away
Ranked #13 because of its Google rating and review volume: 4.9★ from 126 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Coram, 17 mi away
Ranked #14 because of its Google rating and review volume: 5.0★ from 408 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Coram, 12 mi away
Ranked #15 because of its Google rating and trade focus: 4.6★ from 16 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Medford, 17 mi away
Ranked #16 because of its Google rating and review volume: 4.8★ from 601 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Nesconset, 26 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 17 Google reviews, listed on Google as “Waterproofing service”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Maspeth, 22 mi away
Ranked #18 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Terryville, 18 mi away
Ranked #19 because of its Google rating and review volume: 5.0★ from 89 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in West Haven, 30 mi away
Ranked #20 because of its Google rating and review volume: 4.9★ from 120 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in North Haven, 33 mi away
Ranked #21 because of its Google rating and review volume: 4.9★ from 390 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Riverhead
Ranked #22 because of its Google rating and review volume: 4.8★ from 60 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ronkonkoma, 25 mi away
Ranked #23 because of its Google rating and review volume: 5.0★ from 53 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Far Rockaway, 13 mi away
Ranked #24 because of its Google rating and review volume: 4.9★ from 45 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Medford, 17 mi away
Ranked #25 because of its Google rating and review volume: 5.0★ from 43 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
National price ranges in USD, not adjusted for Riverhead. 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 75 Riverhead 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 Riverhead 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 |