11 solar installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in St. Thomas: Gladiator Roofing & Solar, CR Score 87/100; 4.6★ from 48 Google reviews; open 24/7.
Most-reviewed: Toews Power Inc, 25 Google reviews at 4.8★, the most of 11 ranked after Gladiator Roofing & Solar; ranked #10.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
11 St. Thomas solar installers are ranked here by CR Score, from 8 published factors. 1 is open 24/7, 3 open Saturdays and 1 open Sundays, based on posted hours. The median Google rating is 5.0★ across 11 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Gladiator Roofing & Solar | 87 | 4.6★ (48) | Norfolk County, 34 km away | 24/7 | Overall |
| 2 | The Solar Store | 81 | 5.0★ (3) | London, 26 km away | — | — |
| 3 | SunTap Technologies Inc. | 81 | 4.8★ (5) | Norfolk County, 42 km away | — | — |
| 4 | FowlerSolar (Solar Panel Installers/Repairs) | 80 | 5.0★ (9) | Norfolk County, 39 km away | Sat | — |
| 5 | Solcan | 76 | 4.7★ (12) | Norfolk County, 38 km away | — | — |
| 6 | Arntjen Solar NA Inc | 74 | 4.9★ (7) | Woodstock, 52 km away | — | — |
| 7 | Sciencetech Inc | Solar Simulator and Spectroscopy Instrumentation | 72 | 5.0★ (5) | London, 18 km away | — | — |
| 8 | Radiant Electric | 72 | 5.0★ (3) | Aylmer, 15 km away | Sat | — |
| 9 | Blake Group Ltd. | 70 | 5.0★ (3) | Huron East, 59 km away | — | — |
| 10 | Toews Power Inc | 70 | 4.8★ (25) | Huron East, 63 km away | — | Most reviews |
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 review volume: 4.6★ 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 London, 26 km away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Solar energy system service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Norfolk County, 42 km away
Ranked #3 because of its Google rating and trade focus: 4.8★ from 5 Google reviews, listed on Google as “Solar energy company”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Norfolk County, 39 km away
Ranked #4 because of its Google rating and trade focus: 5.0★ from 9 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Norfolk County, 38 km away
Ranked #5 because of its Google rating and trade focus: 4.7★ from 12 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Woodstock, 52 km away
Ranked #6 because of its Google rating and trade focus: 4.9★ from 7 Google reviews, listed on Google as “Solar energy company”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in London, 18 km away
Ranked #7 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “Solar energy equipment supplier”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Aylmer, 15 km away
Ranked #8 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Electrical installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Huron East, 59 km away
Ranked #9 because of its Google rating and trade focus: 5.0★ from 3 Google reviews, listed on Google as “Solar energy system service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Huron East, 63 km away
Ranked #10 because of its Google rating and review volume: 4.8★ from 25 Google reviews, 25 Google reviews.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Aylmer, 23 km away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 4 Google reviews, listed on Google as “Electrician”.
Based on 6 of 8 factors; credentials and recency not yet collected.
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 |
|---|---|---|---|---|---|
| Solar panel installation | CA$38,690 | CA$43,760 | CA$47,600 | Per system: about 12 kW at about $2.60 per watt, before incentives. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 11 St. Thomas solar installers 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 |