With over 40 years of experience and more than 300 fulltime employees across its eight locations in Ontario, Great Northern Insulation (GNI) services homeowners and industry professionals in the residential, commercial, industrial and agricultural sectors. GNI offers a complete list of building envelope products and services for new and retrofit projects to increase energy efficiency, comfort, and structural durability.
These solutions include insulation, air sealing, fireproofing, panel and cladding, building diagnostics, thermography, and more. GNI's head office is located at 935 Keyes Drive, Woodstock, ON. For over 40 years, Great Northern Insulation has increased the comfort, energy efficiency and durability of buildings and homes throughout Ontario.
These solutions include insulation, air sealing, fireproofing, panel and cladding, building diagnostics, thermography, and more. GNI's head office is located at 935 Keyes Drive, Woodstock, ON. For over 40 years, Great Northern Insulation has increased the comfort, energy efficiency and durability of buildings and homes throughout Ontario.
Services
GNI took care of arranging the energy audit beforehand so we could get a rebate on the work. The installers were quick, polite, and cleaned up after themselves! Professional, friendly, explained things, did a great job, and left my home as clean as it was when they came in! At GNI, we service your project with the most experienced staff in the industry.
From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction.
Great Northern Insulation is a premier sponsor of the 2017 ACMO/CCI-T Condominium Conference in Toronto, Ontario. Great Northern Insulation is a registered member of the National Fireproofing Contractors Association. Great Northern Insulation is a proud member of the Heating, Refrigeration and Air Conditioning Institute of Canada.
Build a safer, more sustainable future for our planet as a member of Ontario's largest building envelope provider. Great Northern Insulation offers a challenging and rewarding career in a fast-paced, rapid-growth environment. If you are interested in building a rewarding career within a growing industry, send your resume or questions to careers@gni.ca.
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 stand firmly behind the workmanship of our crews and we are 100% committed to delivering a reliable, high-quality service to all of our customers.
Reviews (14)
Linda Dench
Nov 30, 2021
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Don Hull
Nov 18, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
These folks are very professional. Quote was clear, booking was organized and confirmed at every stage. The Installers Tiffany and Sabrina were polite, diligent and cleaned up afterwards. They even added a required vent without asking. I was thoroughly impressed. Donald Hull
These folks are very professional. Quote was clear, booking was organized and confirmed at every stage. The Installers Tiffany and Sabrina were polite, diligent and cleaned up afterwards. They even added a required vent without asking. I was thoroughly impressed. Donald Hull
Beverley Shapardanis
Oct 19, 2021
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Rufus Dsouza
Sep 13, 2021
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Horrible after sales service.
We went with them because they were recommended by a family member. Upto the insulation everything went smoothly. After insulation we noticed that some lights started to flicker. This may have been caused by one of their people unintentionally messing with a pot light when they were insulating. Called up after sales and they sent over Aaron who took some pictures and 10 days later arrogantly tells me that the fault is mine and they are done with their services.
The least a customer who spent $2000 insulating their attic would expect is that recommend the right person
We went with them because they were recommended by a family member. Upto the insulation everything went smoothly. After insulation we noticed that some lights started to flicker. This may have been caused by one of their people unintentionally messing with a pot light when they were insulating. Called up after sales and they sent over Aaron who took some pictures and 10 days later arrogantly tells me that the fault is mine and they are done with their services.
The least a customer who spent $2000 insulating their attic would expect is that recommend the right person
Stuart Chambers
Aug 30, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
I just had my attic insulated by Great Northern Insulation out of Woodstock, Ontario. Chris and John were very polite, professional, on time, thorough, left our home clean, and allowed us to inspect the final product before closing up the attic. The price was right and we couldn't be happier! Stuart and Brenda in Brantford
I just had my attic insulated by Great Northern Insulation out of Woodstock, Ontario. Chris and John were very polite, professional, on time, thorough, left our home clean, and allowed us to inspect the final product before closing up the attic. The price was right and we couldn't be happier! Stuart and Brenda in Brantford
Tyler Westman
Jun 02, 2021
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Christina Jerome
May 05, 2021
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Andrew Tyrrell
Apr 27, 2021
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We recently completed a large new home insulation project with Great Northern and they did a spectacular job! Follow their recommendations and you will end up with an exceptionally well-insulated home. We are… so impressed with the quality of their work and the punctuality they demonstrated to get the job done on time. We’ve built a few places over the years, this is by far the best insulation job we’ve had done. Many thanks to the GNI team!
Gary Semeniuk
Mar 19, 2021
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We just had out attic spray foamed with closed cell foam and also had an attic top up with blown fiberglass, additional venting and attic hatch upgrade. Bother crews were fantastic, showed up on time, protected our floors covered the window sill that they piped the material in through and did a very thorough clean up after. Showed up on time and… call ahead, to make sure we were ready.
Highly recommend them. We have had a lot of reno's here in the last few months and these guys really understand, great customer care. Matt, Nick and the team will take great care of you...
Highly recommend them. We have had a lot of reno's here in the last few months and these guys really understand, great customer care. Matt, Nick and the team will take great care of you...
Katy R.
Jan 09, 2020
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I work in contracting and hired GNI for work on my own basement. The quote obtained was reasonably priced and I was able to schedule the installation on my preferred date with no issue. The work was completed quickly with no issues arising during installation. Items along the wall such as my sump pump and electrical panel were not damaged or sprayed over in any way and they did a good job protecting materials I had stored in the basement.
Dan H.
Jan 10, 2018
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I had a terrible experience with Great Northern. They had to be watched like a hawk, numerous areas that I was told were completed needed touch-up for example. When I say touch-up, some of these areas weren't touched to begin with. When they were done they left a substantial mess. Hundreds upon hundreds of staples left in the window frames, some windows were left with the poly-tarps still left on and the workers were gone. They left here so fast they forgot the broom and dust pan that they never used here whatsoever in the clean-up. Make sure they don't sweep the over-spray bits
Ryan M.
Mar 02, 2017
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We are very happy with the final finished product of our spray foam installation in our Basement. I would have given 5 stars, but the confusion and poor communication with the booking/scheduling department prevents.
Our Sales person Bill was excellent, he helped explain the process along with some tips and tricks to properly construct and prepare for the install (I was doing much of the framing etc.. myself) which was time and care no other sales person really took.
I received a couple other quotes and GNI came in at a reasonable price (not the lowest, not the highest), but I felt that Bill
Our Sales person Bill was excellent, he helped explain the process along with some tips and tricks to properly construct and prepare for the install (I was doing much of the framing etc.. myself) which was time and care no other sales person really took.
I received a couple other quotes and GNI came in at a reasonable price (not the lowest, not the highest), but I felt that Bill
Paul P.
Dec 15, 2016
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Paul S.
Dec 14, 2016
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We had attic insulation done. It was an easy and clean process that took about 4 hours. The fellas were both very professional and friendly. We had waited for 23 years to do this and cannot figure out why. We now have been upgraded to current requirements and feel good for this. Great Northern was quick and professional in taking care of us