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Industry Professionals

Meeting the needs of industry professionals means the highest level of product and service satisfaction.

Home Builders – Drywallers - Renovation Contractors - Architects and Engineers

General Contractors - Building Inspectors - Property Managers - Condominium Corporations

When 75% of your business comes from repeat customers, something must be working. And across Canada, our trades agree - with homebuilders, general contractors and independent renovators finding themselves on the receiving end of product excellence, business and industry expertise, and the highest levels of customer service. For Great Northern Insulation, it’s really all about our clients - and that’s more than just a corporate slogan.

Based in Woodstock, Ontario, GNI works in practically every sector of the industry - from residential and commercial, to industrial and institutional. And we’re involved in every type of project: general construction; design/build ventures; renovations; and retrofits. We’ve been building our business for over three decades, having grown into six locations with over 200 employees – in short, we’ve built a well-respected reputation on our expertise, our reliability, and our professionalism.

For the real professional, doing it right the first time is worth the time, the effort, and the money. At GNI, it’s the only way we know, and our clients agree - this is a corporate philosophy that allows us to stand behind our workmanship 100%, and provide a commitment to the best service in the business. For today’s building inspector, property manager, or condo corporation, there is no other way – because performing a re-do, re-build, or re-make is costly and prohibitive.

Great Northern Insulation is Canada's largest full-service insulation contractor – a 100% Canadian owned and operated company, and a leader in the industry. Our service approach is unparalleled: with supervisory staff that expedite project inspections; trained technicians and certified installers; “Energy Star” trained sales teams; and a dedicated customer-care staff that affords industry pros the kind of service they expect and demand.

Unfortunately, today’s business environment is fraught with pitfalls: runaway contractors who just don’t finish; scammers who do half the job; and shady operators who promise, but don’t deliver. At GNI, there are no such scenarios – our range of products is warrantied, our installers are insured and covered by WSIB, and your satisfaction is guaranteed. Not to mention, we’re competitive - not the cheapest, but without doubt, the best value for your dollar.

For Great Northern Insulation, nothing appropriates more focus than our commitment to customer satisfaction. We strive for integrity and fair practices in everything we do; the products we install carry the manufacturer’s warranty; installations are ruled by industry codes and standards; and problem issues are resolved in the framework of our “fix or replace” policy. Above all, we project manage in a manner that is eco-friendly and sensitive to the environment.

So what can we do for you? There’s really no need to compromise on product quality, installation expertise, or service - so count on us for experienced and highly trained staff; the right product for the job; punctual scheduling and timetables; and a guarantee on all of the above. We’ll show you that quality truly makes a difference - with trusted brand names, affordable solutions, and technical know-how that is above and beyond the rest.

Trusted for 35 years

100% Satisfaction Guarantee

Industry Leading Professionals

Licensed & Certified


Proudly Serving all of Southern Ontario

GTA; South Central Ontario

450 Industrial Dr.

Milton, Ontario

Canada L9T 5A6

TOLL FREE: 1-800-265-1914