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Customer Promise

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. We are a proud equal opportunity employer.

Service Commitment – At Great Northern Insulation we are committed to achieving customer service excellence and we will work hard wherever possible to satisfy your home insulation requirements within 30 days of contacting our office.

If you contact us via our Customer Service Hotline 1-800-265-1914 or website, we will quickly have one of our Technical Service representatives contact you to set up a free in-home visit.

Here at Great Northern Insulation, we have an experienced, skilled and committed team of specialists with a well-earned reputation for integrity and fair dealing within the industry.

Efficient Customer Billing - If you experience a billing problem call 1-800-265-1914 and our Customer Service Team we will make every attempt to resolve it on the spot. Where an instant resolution is not possible, your Technical Service Representative will call you within two working days with an action plan to resolve your query.

If the solution offered is not to your satisfaction, one of our experienced management team will personally call to resolve your query.

Installation Problem Resolution - If you are not 100% satisfied with our insulation install service please contact us immediately on 1-800-265-1914 to report your concern. We will endeavor to give you a solution on the spot and if we are not able to do so, we will arrange for your Technical Service Representative to visit your property to audit the work performed.

If, during this audit, an issue is identified immediate repair work will be scheduled and carried out at our cost.

Money Back Warranty
If your new insulation doesn't make your home warmer in the winter and cooler in the summer Great Northern Insulation will fix or replace it for free.

Product Warranty
All products installed by Great Northern Insulation are warranted by their manufacturer. The glass wool, castor-oil based spray foam and cellulose is warranted to last the lifetime of your property.

Sustainability Warranty
Our operating procedures aim to prevent pollution or any environmental harm through carefully prepared work and management practices. We are committed to not only the environmental laws, regulations, and codes of practice but also to the moral laws of caring for and looking after our environment.

At Great Northern Insulation we value our team ensuring all members have received adequate safety and confined workplace training, carry the required protective clothing and have been educated on the value of maintaining hydration.

Satisfaction Warranty
Our goal is 100% satisfaction. If a client has any issues with the service offered or quality of work undertaken Great Northern will replace or repair any issue to approved government standards at our cost.

Conditions of Guarantees and Warranties

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

GTA & South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!


Gold Certification promise

GREENGUARD® Gold Certification ensures the strictest criteria for low-level chemical emissions. Certified products are safe for individuals with sensitivities (children/elderly) and safe for use in school environments and health-care facilities. The product certification is widely recognized by the LEED Rating System (Leadership in Energy/Environmental Design).

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


Multi-attribute product certification

ECOLOGOTM is an accredited sign of environmental performance – holistic – green – sustainable - and compliant with strict, third party standards. Life cycle criteria for product certification may include manufacturing and operations; health and environment; product materials and performance; and product innovation, development, and management.


3MTM products.
Quality + Performance = Savings

3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).


Baeumler ApprovedTM
Professional, Certified and Insured

Baeumler ApprovedTM gives you peace of mind when connecting with contractors, trades and home service providers. All Baeumler Approved members have demonstrated high quality work for customers and other trade professionals. Members must also have Workers Compensation, liability insurance of at least $1,000,000 and prove professional certification.

Holmes and Holmes

Holmes and Holmes


Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


Enbridge Incentives

The Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


We are Verified & Bonded by eRenovate. When you choose to proceed with our services through their platform, you receive the gaurantees set forth through their program.

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