Nothing insulates better than spray foam

Great Northern Insulation is Canada's largest full service insulation contractor. Over the past 35 years our 100% Canadian owned and operated company has become the leader in the Home Comfort Industry.

  

GNI can help you Retro-Commission your House or Building to Meet Todays Standards and Codes.

UPGRADE YOUR HOME
AND SAVE BIG WITH GNI!

We are the 'industry professionals'

Great Northern Insulation is Canada's largest full service insulation contractor. Over the past 35 years our 100% Canadian owned and operated company has become the leader in the Home Comfort Industry.

  

WE INSTALL ANY KIND OF INSULATION
TO ANY TYPE OF BUILDING
anywhere in Ontario

  

Welcome to

Great Northern Insulation

At GNI, we service your project 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.

  • Trusted for 35 years

  • Industry Leading Professionals

  • Licensed & Certified

  • 100% Satisfaction Warranty

Select Your Business Stream

Building/Renovating your own Home?

Request a Free In-Home Assessment

Are you an Industry Professional?

Learn why GNI is the right fit for your professional needs! Click here

  • Customer Promise

    Great Northern Insulation is Canada's largest full service insulation contractor. Over the past 30 years our company has become the leader in the Home Comfort Industry.

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  • Watch What We Do

Proudly Serving all of Southern Ontario

GTA; South Central Ontario

450 Industrial Dr.

Milton, Ontario

Canada L9T 5A6

TOLL FREE: 1-800-265-1914