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  • Financing Available
For over 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/working environment and addressing their unique fire protection requirements. We deliver these solutions with the most experienced staff in the industry. To achieve our goal of 100% customer satisfaction, we back all of our services with a satisfaction warranty, money back warranty, product warranty, and a sustainability warranty. We firmly stand by the statement that "There is more to insulating than just adding insulation". When selecting an insulation contractor, evaluate your options based on their experience, product expertise, customer service, and workmanship. Contact Great Northern Insulation today and experience what a true professional contractor can do for you! more...

Opening Hours


Products and Services

  • Blown Loose Fill Attic Insulation,
  • Spray Foam Insulation,
  • Cellulose,
  • Batt Insulation,
  • Blown-in Wall Insulation,
  • Crawl Space Insulation,
    • Fireproofing,
    • Thermal Barrier,
    • Insulation Removal,
    • Airsealing,
    • Acoustical System,
    • Cladding,
    • Firestop & Smoke Seal,
    • 3M Window Film,
    • Vapour Barrier,
    • Building Envelope Consultation,
    • Blower Door Testing,
    • Fibreglass,
    • Thermal Imaging,
  • more...
  • less...

Brands Carried

  • BASF Walltite Eco,
  • Honeywell,
  • Owens Corning,
  • Gaco Western,
  • Winroc,
  • 3M,


  • Highest Performing,
  • Environmentally Friendly Products & Services,
  • On Budget,
  • Installed Right,
  • One Source / Full Service,
  • On Time,

Languages Spoken

  • English,

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Ratings & Reviews

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    Neven G

    Our basement is a lot warmer now. The gentlemen cleaned up afterwards. They also left a window open for circulation (fumes) before they left. We enjoy using our basement now. I recommend Great Northern for spray foaming basements.

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    Came when they said, cleaned up afterward and were gone in short order. Excellent job.

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    Great company to deal with. Matt who did the quote was very knowledgable and answered all my questions. The two guys that came to do attic insulation were on time and did a good job. I've called them for another quote for the basement!!!

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    Another happy customer in London

    The overall experience was very good, the crew was polite & efficient. They cleaned up afterwards and the noise factor during the blown in attic insulation was not too bad at all. I did have to call the office to find out approximately when the crew was to arrive on the prearranged day and no one followed up to see if I was satisfied with the finished project. Two things that would be good additions for even greater customer service. Tom - London

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    Very professional and hard working staff. Arrived right on time. All knew their business and were very helpful in answering my questions. Would definitely recommend this company.

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    Professional and highly recommended!

    Dave and John arrived on time and gave me a call before they come so I could be ready for them. They were helpful in giving me a hand in moving the last few larger items before they began work. I felt comfortable leaving them to spray my basement walls, and they called me when the job was finished. They cleaned up and even reconnected a shelf that had to be moved! We returned home the next day to a clean, well-aired out space, ready to be set back up. We are very happy with the job!

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    I was really impressed with this company. They show up when they say they will. The guy who came to give me the quote and the guys who later came to do the installation were very personable and professional. They were punctual, efficient, neat and cleaned up. I'm very happy with the service.

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    Great work. Done quick and efficiently. Basement spray insulation looks great and seems to be doing it's job.

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    Both Jeff and Ross did an incredible job insulating my basement. They were both very kind and a pleasure to speak with as well as possessed a firm understanding of the trade. Upon completion of the job, had cleaned up very well. The quality of their work was extremely proficient! I would strongly recommend Great Northern to anyone who is looking for insulation work and would definitely be my first call should I require more work completed in the future.

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    Susan G

    Dave and John were very professional. They were respectful about entering my basement from the backyard which helped keep the tracking to a minimum. They cleaned up after insulating and left my home neat and clean. Great job by these two. They left the window open for me to help get rid of the fumes and also texted me when they were done. Thanks , my home is already warmer!

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    Jeff and Ross were very polite, arrived on time and did a very good job. They were happy to provide additional information about their company's products and answered all my questions in a professional manner. Thanks a lot!

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    Lisa D

    Having Great Northern Insulation insulate our basement and attic was a fabulous way to kick off a New Year. We are noticing such a drastic difference in temperature throughout our whole house. Can't wait to see the savings in our utilities. Jeff and Tyler were so professional and used extra care in our home while completing the job you would never have known they were here. Definitely look forward to recommending the Great Northern Insulation to anyone looking for similar services.

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    Jeff and Brendan were fast , courteous very professional . We sure appreciated the work they did . And our house is very warm Thank you

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    Dave, Aaron and Scott were very prompt and professional. They completed the work in good time and tidied up afterwards. Great Northern Insulation met our expectations!!

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    Janet P

    Excellent job. Jeff & Brendan arrived on time, worked quickly, offered to help move some of my furniture and cleaned up after themselves after the job was done. Highly recommend this company.

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    Brian L

    We found Jeff and Brendan to be both friendly and professional.They laid plastic down throughout the house to keep dust to a minimum and cleaned up after themselves. They were also quite thorough. I would recommend them to any of my friends or family

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    Workers came in put a lot of insulation and were here for over an hour but did a thorough job and left the place spotless. Highly professional and recommend them.

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    Brian P

    Knowledgeable advice on which applications work for sound insulating my home. Honest and detailed answers to specific questions, I appreciate their professional advice!

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    Jennefer C

    Matt and Ryan were informative and patient with my questions and both crews; attic and basement, were courteous, quick and didn't leave a mess behind. When there was a small issue in the basement Ryan promptly assessed it and a crew came back and corrected it the same day - very impressed! All my interactions with the office staff were also positive. I`m quite pleased with the service, results, scheduling and overall price. I wouldn't hesitate recommending GNI to family or friends.

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    Great northern rocks!

    The guys showed up on time. They were professional and friendly. They did the job as expected, left the place cleaner then when they arrived. Definitely would recommend them to my friends.

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