8 foundation repair companies ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Thunder Bay: Groundhogs™, CR Score 63/100; 4.9★ from 113 Google reviews.
Best for emergencies (open 24/7): Thunder Bay Outdoor Services, posts 24/7 hours; ranked #6 of 8.
Most-reviewed: Superior Yard Works, 33 Google reviews at 4.9★, the most of 8 ranked after Groundhogs™; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
8 Thunder Bay foundation repair companies are ranked here by CR Score, from ten published factors. 1 is open 24/7, 5 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.8★ across 8 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Groundhogs™ | 63 | 4.9★ (113) | Thunder Bay | — | Overall |
| 2 | AJ's Contracting & Rentals - Thunder Bay Waterproofing Service | 62 | 4.9★ (21) | Thunder Bay | Sat · Sun · Evenings | — |
| 3 | Superior Yard Works | 61 | 4.9★ (33) | Thunder Bay | Sat · Evenings | Most reviews |
| 4 | Giorgio Construction Inc | 61 | 4.9★ (29) | Thunder Bay | Sat | — |
| 5 | Contracting Kings Inc | 59 | 4.0★ (10) | Thunder Bay | Sat · Sun · Evenings | — |
| 6 | Thunder Bay Outdoor Services | 53 | 4.0★ (4) | Thunder Bay | 24/7 | Emergencies |
| 7 | Northwest Drainage Solutions | 50 | 4.6★ (11) | Thunder Bay | — | — |
| 8 | D S I Contracting Inc | 47 | 3.7★ (3) | Thunder Bay | — | — |
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 review volume: 4.9★ from 113 Google reviews, the most in Thunder Bay.
Based in Thunder Bay
Ranked #2 because of its Google rating and trade focus: 4.9★ from 21 Google reviews, listed on Google as “Waterproofing service”.
Based in Thunder Bay
Ranked #3 because of its Google rating and trade focus: 4.9★ from 33 Google reviews, listed on Google as “Waterproofing service”.
Based in Thunder Bay
Ranked #4 because of its Google rating and trade focus: 4.9★ from 29 Google reviews, listed on Google as “Waterproofing service”.
Based in Thunder Bay
Ranked #5 because of its Google rating and trade focus: 4.0★ from 10 Google reviews, listed on Google as “Waterproofing service”.
Based in Thunder Bay
Ranked #6 because of its Google rating and availability: 4.0★ from 4 Google reviews, open 24/7.
Based in Thunder Bay
Ranked #7 because of its Google rating and review volume: 4.6★ from 11 Google reviews.
Based in Thunder Bay
Ranked #8 because of its Google rating and trade focus: 3.7★ from 3 Google reviews, listed on Google as “Concrete contractor”.
US national ranges converted to CAD, not adjusted for Thunder Bay. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Foundation repair | CA$3,130 | CA$7,270 | CA$11,430 | Per project: typical range of customer-reported repairs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 8 Thunder Bay 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 Thunder Bay 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 |