No Radiation Inc.
“I saved a huge amount of money cancelling the sale, with the knowledge that a cell tower two blocks away from the house would have bombarded my family with extreme levels of radiation based on Farzad's readings.”
Best Electricians in Thornhill, ON
24 contractors listed · 13 in Thornhill · 10 open 24/7 · 17 open weekends · 20 rated 4.5+
Data verified October 21, 2026
Sam Electric
“I made the mistake of hiring another electrician once and had to get Sam's guys to come and fix the issues later.”
RAH Electric Corp.
“He walks you through everything step by step and takes time to explain the work he does.”
Alex Bernadski Electrical Contractor
“He explained all of the issues in great detail and included me in decision making when doing the work.”
Hrc Group
“There aren't enough words to praise Shaw and his team for their construction of a new wood fence in our back yard and the repair of a broken wood gate.”
Home Vision Pros
The 24 contractors listed for Thornhill, ON handle panels, circuits, garage feeds and charger installs. What appears under each one about licensing, hours and advertised work is taken from that business's own site, with ratings and comments from public reviews.
Area overview: Thornhill, ON
13 of the 24 contractors we list are based in Thornhill; the other 11 serve Thornhill from towns including Toronto, Markham and Mississauga. 23 of the contractors on this page have a rating, from 3.7 to 5.0 across 4,470 reviews; 11 have 50 or more reviews and 20 are rated 4.5 or higher. When customers rate these contractors on specific qualities, they most often praise professionalism (95%), responsiveness (83%) and punctuality (80%). The topics that come up most in reviews of the contractors on this page are "efficient", "price" and "estimates". 10 are open around the clock; 17 are open on Saturdays and 14 on Sundays. 6 show a licence on their websites. 3 have ten or more years of experience, the longest 28 years. 10 offer emergency call-outs; 2 offer financing or payment plans; 5 give free estimates; 3 are family- or locally-owned and 2 list coupons or special offers. We have a website on file for 22 of the contractors on this page; 22 publish a contact page; 19 list a public email and 1 takes bookings online. We count these figures across the contractors on this page; hours and prices change, so confirm the details with the contractor before you book.
Do any electrical contractors listed for Thornhill quote without charging?
Free estimates are advertised by 5 of the 24 contractors here. That suits a defined job such as a panel change, a garage feed or a charger. Diagnosing an intermittent fault is billable time, and a contractor who offers to do that for nothing is planning to sell you something else.
Acceleration Electrical Services Inc.
“After everything was done, they visited our house twice to make sure that the house is ready for inspection and fixed minor issues that we have not noticed ourselves.”
Quantech Electrical Contractors Limited
Commercial Switchgear Ltd
“Was able to find me a 1600 amp breaker when no one else could.”
Bright Diamond Electric
“Ebi responded really fast to my questions and was very easy to work with.”
Mazda Electric
“Master electrician who provides excellent service at a fair price.”
Apollo Smart Inc
“Very good company who do good work.”
Benco Electric
Innovation Electric Inc.
“Provided detailed information regarding statement of work and answered any questions i had during the implementation.”
Longhouse Electric
“In addition to doing excellent work, I found Ali to be very honest and trustworthy, which is not easy to find.”
Refined Home Services
“These guys did an excellent job clearing my blocked shower drain from first call it was fixed in just a few hours.”
Ontime Electric
“Called on time electric, Sean came to our house and replaced the GFCI receptacles and power to our bathroom is back on.”
Mersey Heating and Air Conditioning
“I will highly recommend this company.”
Circuit Savvy Electric
“The installation is Efficient and timely.”
Quality Potlight
“He directed me to Dana, who was very professional and coordinated the estimate, installation, inspection, and payment without friction.”
Murtex Electric INC
“I don't know a ton about electrical, and Ali is always very good to answer all my questions and provide options for before going ahead.”
Hi-Lite Electric Inc
“Matthew from Hi-Lite come over, diagnosed and fixed the problem quickly and efficiently.”
Safe Electrical Solutions
“Also, they made sure that they didn't open and break so many walls in doing the bathroom wirings to make my next renovation steps faster and more economical.”
Bigguy Electric Inc.
“The price was more than fair for the job we required (soffit lights) & their work was exceptional.”
Why these companies made our list
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