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Why Choose GNI?

Over the past 35 years Great Northern Insulation has increased the comfort, energy efficiency and durability of buildings and homes throughout Ontario.

Our mission is to provide affordable solutions to each and every customer by reducing their energy costs, improving the acoustics of their living or working environment or addressing their unique fire protection requirements.

We deliver this with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best installers, sales representatives, Customer Care personnel, field superintendents, estimating and technical support to your project.

Our commitment to bring to our customers real value: the right products, prompt scheduling, installed right, guaranteed. Living up to this promise every day has earned the respect and trust of our loyal customers. Over 50% of our residential installations are repeat or referral customers.

There is a difference that quality makes. There is more to insulating than just adding insulation. Contact Us today and experience what a true professional contractor can do for you.

Proudly Serving all of Southern Ontario

GTA; South Central Ontario

450 Industrial Dr.

Milton, Ontario

Canada L9T 5A6

TOLL FREE: 1-800-265-1914