240 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Lake Ronkonkoma: Chris Landscaping & Basement Waterproofing corp, CR Score 61/100; 5.0★ from 74 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Pappy's Ultimate Construction, Drainage & Waterproofing, posts 24/7 hours; ranked #2 of 240.
Most-reviewed: Connecticut Basement Systems, 1,655 Google reviews at 4.8★, the most of 240 ranked; ranked #15.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
240 Lake Ronkonkoma foundation repair companies are ranked here by CR Score, from ten published factors. 64 are open 24/7, 200 open Saturdays and 151 open Sundays, based on posted hours. The median Google rating is 4.9★ across 240 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Chris Landscaping & Basement Waterproofing corp | 61 | 5.0★ (74) | West Hills, 2 mi away | Sat · Sun | Overall |
| 2 | Pappy's Ultimate Construction, Drainage & Waterproofing | 60 | 5.0★ (102) | Centereach, 4 mi away | 24/7 | Emergencies |
| 3 | Magic Basement Services | 58 | 5.0★ (17) | Nesconset, 2 mi away | — | — |
| 4 | Foundation Crack Repair LLC | Basement Crack Repair | Basement Waterproofing | French Drains | 57 | 5.0★ (15) | Sayville, 7 mi away | Sat · Sun | — |
| 5 | Building Structures Unlimited Inc. | 57 | 5.0★ (69) | Melville, 15 mi away | Sat | — |
| 6 | HRC Waterproofing | 57 | 4.9★ (77) | Jamaica, 37 mi away | 24/7 | — |
| 7 | Long Island Basement Waterproofing Pros | 57 | 5.0★ (15) | Amityville, 10 mi away | Sat · Sun · Evenings | — |
| 8 | United Waterproofing | 57 | 4.9★ (86) | Ridgefield, 39 mi away | 24/7 | — |
| 9 | Vulcan Basement Waterproofing | 57 | 4.5★ (23) | Hicksville, 20 mi away | 24/7 | — |
| 10 | BOCCIA - Waterproofing & Masonry Specialists | 57 | 4.7★ (115) | Garden City Park, 28 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 in Lake Ronkonkoma
Based in West Hills, 2 mi away
Ranked #1 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 Centereach, 4 mi away
Ranked #2 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 Nesconset, 2 mi away
Ranked #3 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 Sayville, 7 mi away
Ranked #4 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 Melville, 15 mi away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 69 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Jamaica, 37 mi away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 77 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Amityville, 10 mi away
Ranked #7 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 Ridgefield, 39 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 86 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Hicksville, 20 mi away
Ranked #9 because of its Google rating and trade focus: 4.5★ from 23 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Garden City Park, 28 mi away
Ranked #10 because of its Google rating and trade focus: 4.7★ from 115 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Forest Hills, 12 mi away
Ranked #11 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 Medford, 6 mi away
Ranked #12 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 Hell's Kitchen, 10 mi away
Ranked #13 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 Port Jefferson, 9 mi away
Ranked #14 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 Seymour, 39 mi away
Ranked #15 because of its Google rating and review volume: 4.8★ from 1,655 Google reviews, the most in Lake Ronkonkoma.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Ronkonkoma, 2 mi away
Ranked #16 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 Maspeth, 4 mi away
Ranked #17 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 Westbury, 23 mi away
Ranked #18 because of its Google rating and trade focus: 4.9★ from 93 Google reviews, listed on Google as “Roofing contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Rye, 31 mi away
Ranked #19 because of its Google rating and trade focus: 4.6★ from 29 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Massapequa, 20 mi away
Ranked #20 because of its Google rating and review volume: 5.0★ from 479 Google reviews.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Albertson, 27 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 215 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Coram, 9 mi away
Ranked #22 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 Briarcliff Manor, 39 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 26 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Huntington, 16 mi away
Ranked #24 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 Bay Shore, 8 mi away
Ranked #25 because of its Google rating and trade focus: 4.7★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based on 8 of 10 factors; credentials and recency not yet collected.
#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 240 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 |
|---|---|---|
| Affordable Norwalk Roofers | 5.0★ (1) | 23 mi |
| American Dry Basement Systems | 5.0★ (2) | 28 mi |
| Aslam Roofing and Waterproofing. | 5.0★ (2) | 33 mi |
| Crown Waterproofing | 4.5★ (2) | 37 mi |
| Diamond NY Construction | 3.0★ (2) | 39 mi |
| GoNano of Long Island | 5.0★ (1) | 13 mi |
| Grant’s Customs Carpentry LLC | 5.0★ (2) | 40 mi |
| I.K Construction | 5.0★ (2) | 38 mi |
| Innovate Builders Inc | 3.0★ (2) | 31 mi |
| LI Landscaping And Tree Service | 5.0★ (1) | 7 mi |
| Maintenance Experts of Long Island | 3.0★ (2) | 2 mi |
| Norwalk Marine Contractors Inc | 5.0★ (1) | 23 mi |
| NYC DOB Local Law 11 Facade Repairs Contractors | 5.0★ (2) | 39 mi |
| Quality Masonry And Foundation Repair | 5.0★ (2) | 24 mi |
| Rain King Waterproofing, Inc. | 5.0★ (2) | 39 mi |
| Torres Line Construction | 5.0★ (2) | 23 mi |
| Tri Care Lawn Services | 5.0★ (1) | 8 mi |
| ValueDry Basement Waterproofing & Remodeling | 4.0★ (2) | 24 mi |
| Waterproofing Restoration of Baldwin | 5.0★ (2) | 28 mi |
| Yavas & Co. | 4.8★ (6) | In Lake Ronkonkoma |
National price ranges in USD, not adjusted for Lake Ronkonkoma. 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 240 Lake Ronkonkoma 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 Lake Ronkonkoma 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 |