35 general contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Thunder Bay: WINMAR Property Restoration Specialists - Thunder Bay, CR Score 93/100; 4.9★ from 29 Google reviews; open 24/7.
Best for emergencies (open 24/7): Cambrian Vacuum Corporation, posts 24/7 hours; ranked #3 of 35.
Most-reviewed: Massaro Construction Ltd, 48 Google reviews at 4.9★, the most of 35 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
35 Thunder Bay general contractors are ranked here by CR Score, from 8 published factors. 2 are open 24/7, 7 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.4★ across 35 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | WINMAR Property Restoration Specialists - Thunder Bay | 93 | 4.9★ (29) | Thunder Bay | 24/7 | Overall |
| 2 | The Shed Guy Ltd. | 88 | 5.0★ (22) | Thunder Bay | Sat · Sun · Evenings | — |
| 3 | Cambrian Vacuum Corporation | 87 | 5.0★ (7) | Thunder Bay | 24/7 | Emergencies |
| 4 | JB Brothers Developments Ltd. | 84 | 5.0★ (19) | Thunder Bay | Sat | — |
| 5 | Massaro Construction Ltd | 84 | 4.9★ (48) | Thunder Bay | — | Most reviews |
| 6 | Thunder Bay Multi Trades | 83 | 3.6★ (12) | Thunder Bay | — | — |
| 7 | DKI - TIL-KA | 83 | 4.7★ (46) | Thunder Bay | — | — |
| 8 | SRL Contracting Corp. | 82 | 4.9★ (32) | Thunder Bay | — | — |
| 9 | Nordex Contracting INC. | 81 | 5.0★ (9) | Thunder Bay | Sat | — |
| 10 | NORTHERN CRACK SEALERS INC. | 81 | 3.4★ (5) | Thunder Bay | — | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 in Thunder Bay
Based in Thunder Bay
Ranked #1 because of its Google rating and availability: 4.9★ from 29 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #2 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “Construction company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #3 because of its Google rating and availability: 5.0★ from 7 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #4 because of its Google rating and trade focus: 5.0★ from 19 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #5 because of its Google rating and review volume: 4.9★ from 48 Google reviews, the most Google reviews on this list (48).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #6 because of its Google rating and trade focus: 3.6★ from 12 Google reviews, listed on Google as “General contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Thunder Bay
Ranked #7 because of its Google rating and trade focus: 4.7★ from 46 Google reviews, listed on Google as “Construction company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #8 because of its Google rating and trade focus: 4.9★ from 32 Google reviews, listed on Google as “Construction company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #9 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #10 because of its Google rating and trade focus: 3.4★ from 5 Google reviews, listed on Google as “Construction company”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Thunder Bay
Ranked #11 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “General contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Thunder Bay
Ranked #12 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “General contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Thunder Bay
Ranked #13 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #14 because of its Google rating and trade focus: 5.0★ from 11 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #15 because of its Google rating and trade focus: 4.2★ from 12 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #16 because of its Google rating and trade focus: 3.9★ from 16 Google reviews, listed on Google as “Construction company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #17 because of its Google rating and trade focus: 3.7★ from 3 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #18 because of its Google rating and trade focus: 4.2★ from 10 Google reviews, listed on Google as “Construction company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #19 because of its Google rating and trade focus: 4.3★ from 11 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #20 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #21 because of its Google rating and trade focus: 4.1★ from 9 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #22 because of its Google rating and trade focus: 4.1★ from 9 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #23 because of its Google rating and trade focus: 4.4★ from 7 Google reviews, listed on Google as “General contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #24 because of its Google rating and trade focus: 4.0★ from 12 Google reviews, listed on Google as “Construction company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thunder Bay
Ranked #25 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
#1 to #25 are shown in full above. Here are #26 to #35, in CR Score order; each links to its profile.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Finnway General Contractor Inc | 75 | 3.1★ (10) | In Thunder Bay |
| 27 | Taranis Contracting Group Ltd. | 74 | 3.4★ (5) | In Thunder Bay |
| 28 | Kozak Construction TBay | 74 | 5.0★ (3) | In Thunder Bay |
| 29 | Tom Jones Corporation | 74 | 3.5★ (4) | In Thunder Bay |
| 30 | PDR Contracting | 73 | 3.7★ (3) | In Thunder Bay |
| 31 | Mirabelli Corporation | 73 | 3.7★ (3) | In Thunder Bay |
| 32 | Leo's Construction Services | 73 | 5.0★ (3) | In Thunder Bay |
| 33 | Thunder Contracting | 72 | 3.7★ (3) | In Thunder Bay |
| 34 | Tycon Construction Inc | 71 | 4.0★ (8) | In Thunder Bay |
| 35 | T D Owen Construction Inc | 71 | 4.6★ (9) | In Thunder Bay |
20 more general contractors within 40 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
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 |
|---|---|---|---|---|---|
| Kitchen remodel | CA$20,510 | CA$37,930 | CA$58,490 | Per project: typical range of customer-reported remodels (about $75 to $250 per sq ft). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
| Bathroom remodel | CA$9,350 | CA$17,080 | CA$24,820 | Per bathroom: typical range of customer-reported remodels. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 35 Thunder Bay general contractors on 8 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. Unknown factors are left out of the score, 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 | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |