170 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Williamstown: Four Leaf Restoration Waterproofing and Mold Remediation, CR Score 62/100; 5.0★ from 51 Google reviews; open 24/7.
Best for emergencies (open 24/7): Waterproofing 4 Less LLC Mold Remediation And Waterproofing Specialist, posts 24/7 hours; ranked #2 of 170.
Most-reviewed: Jamison Basement Waterproofing, 1,583 Google reviews at 5.0★, the most of 170 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
170 Williamstown foundation repair companies are ranked here by CR Score, from ten published factors. 38 are open 24/7, 117 open Saturdays and 73 open Sundays, based on posted hours. The median Google rating is 4.9★ across 170 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Four Leaf Restoration Waterproofing and Mold Remediation | 62 | 5.0★ (51) | Williamstown | 24/7 | Overall |
| 2 | Waterproofing 4 Less LLC Mold Remediation And Waterproofing Specialist | 61 | 5.0★ (72) | Hammonton, 11 mi away | 24/7 | Emergencies |
| 3 | Finally Dry Waterproofing | 61 | 5.0★ (50) | Lindenwold, 9 mi away | 24/7 | — |
| 4 | South Jersey Waterproofing | 61 | 4.7★ (35) | Williamstown | 24/7 | — |
| 5 | Jamison Basement Waterproofing | 60 | 5.0★ (1,583) | Oreland, 31 mi away | Sat | Most reviews |
| 6 | Groundworks | 60 | 4.8★ (1,286) | Montgomeryville, 39 mi away | Sat · Sun · Evenings | — |
| 7 | ABSOLUTE Waterproofing & Renovations | 59 | 5.0★ (99) | Bridgewater, 30 mi away | 24/7 | — |
| 8 | A Waterproofing Solution Inc | 59 | 4.9★ (189) | King of Prussia, 36 mi away | 24/7 | — |
| 9 | Jersey State Waterproofing llc | 59 | 5.0★ (15) | Atco, 9 mi away | 24/7 | — |
| 10 | Philadelphia Foundation Repair & Waterproofing | 58 | 5.0★ (61) | Philadelphia, 20 mi away | Sat · Sun · Evenings | — |
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 in Williamstown
Based in Williamstown
Ranked #1 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Waterproofing service”.
Based in Hammonton, 11 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 72 Google reviews, listed on Google as “Waterproofing service”.
Based in Lindenwold, 9 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 50 Google reviews, listed on Google as “Waterproofing service”.
Based in Williamstown
Ranked #4 because of its Google rating and trade focus: 4.7★ from 35 Google reviews, listed on Google as “Waterproofing service”.
Based in Oreland, 31 mi away
Ranked #5 because of its Google rating and review volume: 5.0★ from 1,583 Google reviews, the most in Williamstown.
Based in Montgomeryville, 39 mi away
Ranked #6 because of its Google rating and trade focus: 4.8★ from 1,286 Google reviews, listed on Google as “Waterproofing service”.
Based in Bridgewater, 30 mi away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 99 Google reviews, listed on Google as “Waterproofing service”.
Based in King of Prussia, 36 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 189 Google reviews, listed on Google as “Waterproofing service”.
Based in Atco, 9 mi away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based in Philadelphia, 20 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 61 Google reviews, listed on Google as “Waterproofing service”.
Based in Sicklerville, 3 mi away
Ranked #11 because of its Google rating and trade focus: 3.9★ from 14 Google reviews, listed on Google as “Waterproofing service”.
Based in Philadelphia, 27 mi away
Ranked #12 because of its Google rating and trade focus: 4.8★ from 371 Google reviews, listed on Google as “Waterproofing service”.
Based in Radnor, 31 mi away
Ranked #13 because of its Google rating and trade focus: 5.0★ from 46 Google reviews, listed on Google as “Waterproofing service”.
Based in Wilmington, 31 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 283 Google reviews, listed on Google as “Waterproofing service”.
Based in Pennsville, 17 mi away
Ranked #15 because of its Google rating and trade focus: 4.7★ from 368 Google reviews, listed on Google as “Waterproofing service”.
Based in Glassboro, 8 mi away
Ranked #16 because of its Google rating and trade focus: 4.7★ from 15 Google reviews, listed on Google as “Waterproofing service”.
Based in Chester, 28 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 51 Google reviews, listed on Google as “Waterproofing service”.
Based in Bellmawr, 12 mi away
Ranked #18 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “Waterproofing service”.
Based in Newark, 39 mi away
Ranked #19 because of its Google rating and trade focus: 4.8★ from 196 Google reviews, listed on Google as “Waterproofing service”.
Based in Pennsauken, 23 mi away
Ranked #20 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Waterproofing service”.
Based in Atco, 30 mi away
Ranked #21 because of its Google rating and trade focus: 5.0★ from 43 Google reviews, listed on Google as “Waterproofing service”.
Based in Cinnaminson, 26 mi away
Ranked #22 because of its Google rating and trade focus: 5.0★ from 27 Google reviews, listed on Google as “Waterproofing service”.
Based in Carneys Point, 15 mi away
Ranked #23 because of its Google rating and review volume: 4.9★ from 142 Google reviews.
Based in Audubon, 14 mi away
Ranked #24 because of its Google rating and trade focus: 4.8★ from 89 Google reviews, listed on Google as “Waterproofing service”.
Based in Claymont, 26 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 10 Google reviews, listed on Google as “Waterproofing service”.
#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 170 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 |
|---|---|---|
| Airtight Design Advanced Waterproofing | 5.0★ (1) | 17 mi |
| American Specialists LLC | 5.0★ (1) | 16 mi |
| Anthony Dambro General Contractor, Inc. | 5.0★ (2) | 27 mi |
| Barretta Masonry LLC | 5.0★ (2) | In Williamstown |
| Basement Waterproofing One | 5.0★ (2) | 38 mi |
| Basement Waterproofing Specialists | 5.0★ (2) | 15 mi |
| D&S Tamburro Construction | 5.0★ (1) | 18 mi |
| Delco Contracting | 4.5★ (2) | 30 mi |
| French Drains USA, LLC | 5.0★ (2) | 15 mi |
| Koering Excavating Inc | 5.0★ (1) | 16 mi |
| Laszlo Masonry & Restoration | 5.0★ (2) | 38 mi |
| Marc Rossi Waterproofing | 5.0★ (2) | 27 mi |
| Perfect Dry Basement | 5.0★ (2) | 39 mi |
| Rahn Companies Inc | 3.6★ (30) | In Williamstown |
| Ridley Concrete & Masonry | 5.0★ (2) | 22 mi |
| Roofed Right America LLC | 5.0★ (1) | 16 mi |
| Smith's Chimney Service, LLC | 4.7★ (196) | In Williamstown |
| The Basic Companies - Basements, Bathrooms, Kitchens, Waterproofing | 4.5★ (2) | 29 mi |
| US Construction and Waterproofing LLC | 3.0★ (2) | 23 mi |
| Waterproofing 4 Less, LLC Mold Remediation And Basement Waterproofing Specialist | 5.0★ (1) | 15 mi |
National price ranges in USD, not adjusted for Williamstown. 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 170 Williamstown 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 Williamstown 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 |