General Contractors in Gravenhurst, Ontario

"I have worked with GNI many times over the years and have always been happy with the products and services. This..."

"I had Windows by Installer replace some windows& doors in my house 2 1/2 years ago. This spring, I went to open the..."

"Excellent company. I have never found any company that works with their customers as much as this company does. They..."

"If I had found Brent months earlier, my huge renovation job would have cost me a lot less and been done quicker...."

"Shows up really early (4:30am) every morning. Workmanship was the best I have ever had! My neighbour whish he started..."