114 roofers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in St. Thomas: Advanced Level Homes - Roofing & Exteriors, CR Score 89/100; 5.0★ from 133 Google reviews; open 7 days a week.
Best for emergencies (open 24/7): Aok Roofing Inc., posts 24/7 hours; ranked #2 of 114.
Most-reviewed: Elgin Roofing, 256 Google reviews at 4.9★, the most of 114 ranked; ranked #24.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
114 St. Thomas roofers are ranked here by CR Score, from 8 published factors. 19 are open 24/7, 58 open Saturdays and 39 open Sundays, based on posted hours. The median Google rating is 4.9★ across 114 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Advanced Level Homes - Roofing & Exteriors | 89 | 5.0★ (133) | London, 18 km away | Sat · Sun · Evenings | Overall |
| 2 | Aok Roofing Inc. | 88 | 4.9★ (230) | London, 34 km away | 24/7 | Emergencies |
| 3 | Southwinds Roofing | 88 | 4.7★ (71) | London, 28 km away | 24/7 | — |
| 4 | North London Roofing | 88 | 4.5★ (98) | London, 25 km away | 24/7 | — |
| 5 | Shockwave Roofing | 87 | 5.0★ (96) | London, 25 km away | Sat · Sun | — |
| 6 | Ryan McKay Roofing Ltd | 87 | 5.0★ (22) | Norfolk County, 23 km away | 24/7 | — |
| 7 | Gladiator Roofing & Solar | 86 | 4.6★ (48) | Norfolk County, 34 km away | 24/7 | — |
| 8 | LONDON HOME SERVICES INC | 86 | 5.0★ (13) | London, 19 km away | 24/7 | — |
| 9 | A & K Roofing Co Ltd | 85 | 4.9★ (12) | London, 17 km away | 24/7 | — |
| 10 | Legendary Exteriors | 85 | 4.6★ (19) | London, 24 km away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and trade focus: 5.0★ from 133 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 34 km away
Ranked #2 because of its Google rating and trade focus: 4.9★ from 230 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 28 km away
Ranked #3 because of its Google rating and availability: 4.7★ from 71 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 25 km away
Ranked #4 because of its Google rating and availability: 4.5★ from 98 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 25 km away
Ranked #5 because of its Google rating and trade focus: 5.0★ from 96 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 23 km away
Ranked #6 because of its Google rating and availability: 5.0★ from 22 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 34 km away
Ranked #7 because of its Google rating and availability: 4.6★ from 48 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 19 km away
Ranked #8 because of its Google rating and availability: 5.0★ from 13 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 17 km away
Ranked #9 because of its Google rating and availability: 4.9★ from 12 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 24 km away
Ranked #10 because of its Google rating and availability: 4.6★ from 19 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 25 km away
Ranked #11 because of its Google rating and availability: 5.0★ from 13 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 20 km away
Ranked #12 because of its Google rating and availability: 4.6★ from 14 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 40 km away
Ranked #13 because of its Google rating and availability: 5.0★ from 21 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 27 km away
Ranked #14 because of its Google rating and trade focus: 4.7★ from 77 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 16 km away
Ranked #15 because of its Google rating and trade focus: 5.0★ from 28 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 1 km away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 53 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 24 km away
Ranked #17 because of its Google rating and availability: 4.7★ from 12 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Huron East, 21 km away
Ranked #18 because of its Google rating and availability: 5.0★ from 8 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 16 km away
Ranked #19 because of its Google rating and trade focus: 5.0★ from 37 Google reviews, listed on Google as “Roofing contractor”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in London, 29 km away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 131 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 22 km away
Ranked #21 because of its Google rating and availability: 4.9★ from 78 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 19 km away
Ranked #22 because of its Google rating and trade focus: 4.8★ from 73 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 20 km away
Ranked #23 because of its Google rating and trade focus: 4.9★ from 16 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Aylmer, 16 km away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 256 Google reviews, listed on Google as “Roofing contractor”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 22 km away
Ranked #25 because of its Google rating and trade focus: 5.0★ from 65 Google reviews, listed on Google as “Roofing 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 #40, in CR Score order; each links to its profile. We publish the top 40 of 114 ranked roofers here; the rest are on their profiles.
| Rank | Business | CR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Best Investment Roofing & Sheet Metals | 82 | 4.2★ (9) | 20 km |
| 28 | Better Construction Co. | 82 | 5.0★ (3) | 26 km |
| 33 | Custom Contracting Roofing & Eavestrough Repair London | 81 | 2.7★ (7) | 24 km |
| 40 | James Mulligan Roofing | 80 | 5.0★ (5) | 40 km |
5 more roofers within 64 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| D & M Roofing | 5.0★ (3) | 18 km |
| King Quality Roofing | 4.0★ (4) | 21 km |
| Smaill Roofing | 3.9★ (11) | 33 km |
| Thomas Roofing London Ltd. | 4.1★ (9) | 24 km |
| Wolfe's Roofing | 4.4★ (26) | 60 km |
US national ranges converted to CAD, not adjusted for St. Thomas. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Roof replacement | CA$10,540 | CA$14,050 | CA$19,680 | Per project: asphalt shingles on a 1,700 sq ft home (about 2,000 sq ft of roof). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
| Roof repair | CA$560 | CA$1,650 | CA$2,770 | Per repair: typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
In Ontario, roofers are busiest from late spring to early fall, when shingles can be installed in mild, dry weather. After a big storm, get more than one quote and check the license or registration before signing.
We scored 114 St. Thomas roofers 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 St. Thomas 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 |