- Willowdale
- Also solar battery storage and commercial solar installation
58/100 SolarPanelFinder Score
- Says it has been going since 2012
6/6 details published6 of 6 details published
Best Commercial Solar Contractors in Toronto & the GTA
Last updated By The SolarPanelFinder Rooftop Desk
What it costs20 commercial solar contractors serve Toronto and the GTA, compiled August 2026.
305 Google reviews · median 4.6★ · typical commercial rooftop solar, Ontario $2.15–$3.00 per watt installed (CAD), per Green Building Canada, What Commercial Solar Panels Cost in Canada 2026
- Acton
- Also solar design and consulting and commercial solar installation
56/100 SolarPanelFinder Score
- Says it has been going since 1991
5/6 details published5 of 6 details published
- Oshawa
- Also commercial solar installation
54/100 SolarPanelFinder Score
6/6 details published6 of 6 details published
- Markham
- Also commercial solar installation
53/100 SolarPanelFinder Score
6/6 details published6 of 6 details published
No rating collected- King West
52/100 SolarPanelFinder Score
- Says it is licensed
- Says it has been going since 2006
4/6 details published4 of 6 details published
- Willowdale
- Also solar design and consulting
52/100 SolarPanelFinder Score
6/6 details published6 of 6 details published
- Islington-City Centre West
- Also commercial solar installation
52/100 SolarPanelFinder Score
6/6 details published6 of 6 details published
- Bayview Village
- Also commercial solar installation
50/100 SolarPanelFinder Score
5/6 details published5 of 6 details published
- Leaside
- Also commercial solar installation
44/100 SolarPanelFinder Score
- Says it is licensed
6/6 details published6 of 6 details published
- Richmond Hill
- Also commercial solar installation
42/100 SolarPanelFinder Score
5/6 details published5 of 6 details published
20 commercial solar contractors cover Toronto and the GTA here, at a median 4.6★ across 305 Google reviews. Green Building Canada, What Commercial Solar Panels Cost in Canada 2026 puts commercial rooftop solar, Ontario at $2.15–$3.00 per watt installed (CAD). Order comes from one published score across reviews, what each company states on its own site, and how complete its record is. No company buys a position.
Every row names its source
Toronto pricing for commercial solar installation
Green Building Canada, What Commercial Solar Panels Cost in Canada 2026 puts commercial rooftop solar, Ontario at $2.15–$3.00 per watt installed (CAD), and commercial solar, Canada-wide, before incentives at $1.90–$2.80 per watt installed (CAD) (Green Building Canada, What Commercial Solar Panels Cost in Canada 2026). Posted figures normally exclude HST. The two headline rows are below; the remaining 8 line items, each naming its own source, are on the cost guide.
| Item | Typical range | Unit | Source |
|---|---|---|---|
| Commercial rooftop solar, Ontario | $2.15–$3.00 | per watt installed (CAD) | Green Building Canada, What Commercial Solar Panels Cost in Canada 2026 |
| Commercial solar, Canada-wide, before incentives | $1.90–$2.80 | per watt installed (CAD) | Green Building Canada, What Commercial Solar Panels Cost in Canada 2026 |
Arithmetic, not opinion
How does SolarPanelFinder rank commercial solar contractors?
No position is for sale. 25% of rated commercial solar contractors clear 4.8★, so the gaps here are narrow, and the published score is what separates them. The formula, in full.
Calculators
Price the job before you call anyone
Each of these works out a number from figures you enter, and names every source it uses on screen.
Questions to ask your installer
- Who carries out the structural review of the roof, and is it stamped?
- How does the utility connection review differ from a residential application?
- Has the roofing manufacturer approved your attachment method in writing?
- Where does your scope end and the electrical contractor's begin? How commercial scopes are priced
- What monitoring and service response is included after commissioning?
Frequently asked questions
Toronto and the GTA: what is commercial solar installation running to?
- Green Building Canada, What Commercial Solar Panels Cost in Canada 2026 puts commercial rooftop solar, Ontario at $2.15–$3.00 per watt installed (CAD), and commercial solar, Canada-wide, before incentives at $1.90–$2.80 per watt installed (CAD) (Green Building Canada, What Commercial Solar Panels Cost in Canada 2026). Those figures normally exclude HST. Every line item and its source sits in the commercial solar cost guide.
How do I choose a commercial solar contractor in the GTA?
- Get three itemized written quotes and read what differs between them, not just the total. SolarPanelFinder lists 20 commercial solar contractors at a median 4.6★, the middle company sitting on 13 reviews. Ask each one for proof of licence and insurance, plus recent local addresses you can call. SolarPanelFinder does not check licences or insurance.
Which permits apply to commercial solar installation in Ontario?
- An ESA permit and inspection for the electrical work, usually a municipal building permit for a roof-mounted array, and an application to Toronto Hydro, Alectra or Elexicon to connect to the grid. Who files each one is set out on our Ontario incentives and approvals page. Ask before you sign.
Can a company pay for a higher spot on SolarPanelFinder?
- No. Order comes from one published score out of 100: a review-weighted Google rating, what each company states about itself on its own site, and how complete its record is. Money changes nothing. 25% of rated commercial solar contractors clear 4.8★, so the gaps are narrow. The formula is published on our methodology page.
Elsewhere on this site
What should you read next?
The other Greater Toronto Area categories on SolarPanelFinder, plus what this work costs.
More than commercial solar installation? See the whole directory
This site does not take quote requests and passes nothing to anyone. Every profile shows the company's own phone number and website, so you contact whoever you want to, directly.