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Mill Street & Co.Western Ontario

Mill Street & Co. is a diversified investment company committed to creating sustainable, long-term growth through the intelligent application and management of capital.


Founded in 1954, Clarksburg Contractors, Ltd. provides HVAC, electrical, and mechanical contracting services to Northern Ontario. The company operates in commercial, industrial and residential markets.

BSGAll of Ontario

With six locations across Ontario and 30 years of experience, Barrier Sciences Group (BSG) is the leading building envelope consulting firm. Building managers, owners and contractors rely upon BSG to evaluate the best approaches to enhancing energy conservation and insulation. BSG specializes in deep energy retrofit for residential, industrial, commercial and institutional buildings.

Thorold Lumber & Home Centre Inc.Niagara Region

For over 100 years, Thorold has been serving the construction and renovation sector in the Niagara region of Southern Ontario. Along with a full range of tools and building supplies, Thorold supplies trim, decks, and fences, as well as windows and doors.

Uxport ToolsPort Perry Region

Located in Port Perry, Ontario, Uxport Tools is a full line supplier for the Industrial, Contractor, Commercial, Airline & Mining industries. Uxport supplies tools & equipment, abrasives & cutting, fasteners, anchors and welding supplies and accessories, with direct to site delivery.

SierraWest Toronto

Since 1964, Sierra has been supplying highly specialized tools, fastener and anchor systems to the commercial and industrial construction trades in Toronto’s west end. Sierra takes pride in the reputation it has established as the industry source for premium products, advanced concrete anchoring and drilling systems, and expert product knowledge.

TrinityGreater Toronto Area

Trinity Energy Innovations Inc. brings 25 years of buildings systems experience to some of the most noteworthy companies and building managers across the Greater Toronto Area. Trinity solutions include energy management and audits, engineering, installation, replacement/retrofit, maintenance/repair, building automation, variable frequency drives, solar/wind energy, and gas monitoring, among many others.

LumbermensAll of Ontario

Founded in 1915, Lumbermens is the largest provider of commercial credit information in North America. It offers specialized construction and commercial credit reporting products based on real-time data, enabling its members to improve their receivables risk and days sales outstanding.


Founded in 1988, Speed Fastening Systems serves the fastener, equipment and tool needs of Ontario’s construction industry through two Toronto locations. Recognized as a service leader, Speed Fastening delivers orders directly to customer sites, and provides mission critical tool repairs. 

ParliamentGreater Toronto Area

Parliament Building Supplies is a trusted partner to residential, commercial, and industrial builders, contractors, and homeowners. As a one-stop-shop for lumber and building supplies, Parliament provides expert advice, quality products and rapid turn-around time – hallmarks of the company’s service oriented approach.

AirconGreater Toronto Area

Aircon Mechanical Systems provides highly advanced turn-key HVAC solutions for various industrial and commercial applications, specializing in large and highly complex installations.

Sauve's LumberTimmins Region

Established in 1985, Sauve has become the destination of choice for lumber, construction,home and garden materials, tools, and accessories in Timmins, Ontario and surrounding area.

Tuque InsuranceAll of Ontario

Tuque is an insurance company that is leveraging advanced technology to enhance the customer experience. Along with this fresh approach to customer interaction and the transactional process of purchasing insurance, the company will be introducing innovative insurance products to the evolving Canadian marketplace.

Impact ToolsWest Toronto

For 42 years, Impact Tools has been providing industrial power tool equipment to a broad range of customers through its location in Toronto’s west-end and online. Its commitment to the highest levels of service has nurtured a loyal customer base who continue to rely on Impact for accessing a broad range of product and parts, and product knowledge in the power tools segment of the industrial and construction supplies market.

Nottawasaga MechanicalBarrie Region

For over 30 years, Nottawasaga Mechanical has been delivering comfort and peace of mind to the Barrie and Georgian Triangle Area of Ontario as a heating, air conditioning and refrigeration contractor of choice. 

The Lumber GuysGreat Toronto Area

The Lumber Guys is a fully equipped and resourced lumber supplier in all of the G.T.A. It is their mission to satisfy absolutely all of your lumber requirements, with the fastest service, best quality and at the lowest price.

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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