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Now hiring for roles across Ontario.

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Careers built here.

Warm up your future with Ontario's leading insulation contractor

When you work with us, no two days are ever the same, and there's no end to opportunities for growth and learning on the job. We're looking for conscientious, motivated people who face every day with a positive attitude. Whether you're new to construction or have years of experience under your toolbelt, you can build an amazing career in a growing industry.

Ontario's #1 building envelope service provider

Founded in 1980, we work across commercial, industrial, residential and agricultural sectors, with close to 350 employees across 8 branches. We work with some of the largest construction companies in the country and are backed by Ironbridge Equity Partners.

A commitment to values

  1. We're the biggest and most progressive company of our kind in Ontario, and we're growing fast. Our goal is to be #1 in the country – and help builders and homeowners build safe, sustainable, energy-efficient communities. We’re looking for employees who believe in our values as much as we do:
  1. We do the right thing.
    We work with integrity and are always open, honest and genuine. We demonstrate sound ethics and promise to grow our business in a way that shapes a better future – and makes us all proud.
  2. Be customer-obsessed.
    Putting others first comes first for us. By providing exceptional service, we build trust and strong relationships that make a positive difference in our customers’ lives.
  3. We lead the way.
    Every one of us has the power to engage and inspire others. We do our best every day and hold ourselves accountable. We’re building something bigger and better…together.
  4. We elevate others.
    By building a welcoming workplace and treating each other with respect, everyone has an equal opportunity to thrive.
  5. We deliver.
    Our customers and colleagues can count on our very best, every day. We’re committed to safety and quality – no compromises.

A culture of trust and growth

Our customers trust us to deliver exceptional service – and we trust our employees to manage each jobsite and provide the outstanding service customers expect.

With that trust comes support, training and opportunity for growth: we actively invest in our employees by promoting from within, providing training in state-of-the-art facilities, and encouraging constant learning and growth.

Read more about what it's like working as an insulation technician on our blog:

  1. Start a Career in Building Science with On-the-Job Training
  2. A Day in the Life of an Insulation Technician
  3. Women in the Trades: Meet GNI's Only All-Female Crew


We listen.

No matter what your role, you’ll always have a chance to be heard – and to make a difference. Bring your ideas and ask questions! We want to hear them. And we’ll share our ideas with you, too. At regular town halls, you’ll get updates on branch and company performance, outstanding individual achievements, and transparent communication on where we’re headed.


Employee benefits

You also get these benefits when you work in the field

There’s A Great Career Waiting For You At Great Northern Insulation.

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

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

Greater Toronto Area

2 Guided Court
Etobicoke, ON
M9V 4K6

TOLL FREE: 1-800-265-1914

GTA East

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

TOLL FREE: 1-800-265-1914

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

Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.

Homestars Best of 2021 Award

Best of 2021

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

Homestars Best of 2022 Award

Best of 2022

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


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

Trusted for Over 40 Years

Over 40 Years in Business

At GNI, we service your project with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best Installers, Sales Representatives, Customer Care Personnel, Field Superintendents, Estimating and Technical Support to your project.

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

January, 2021 regulatory phaseout of hydrofluorocarbons (HFCs) with the introduction of WALLTITE CM01. Using hydrofluorolefins (HFOs) with lower global warming potential (GWP) compared to HFCs, WALLTITE CM01 is the next generation of spray foam insulation.



Heatlok® Soya HFOTM leverages Honeywell’s latest Solstice® Liquid Blowing Agent technology. This new hydrofluoroolefin (HFO) blowing agent is the most environmentally conscious blowing agent produced to date, with a zero ozone depletion potential (ODP) and a global warming potential (GWP) of 1, which is more than two orders of magnitude (99.9%) lower than HFCs used in this industry.


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).

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 Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – 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.

As Seen on Love It or List It

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer Cellulose


CLIMATIZER PLUS cellulose insulation is manufactured from a minimum of 85% locally-sourced post-consumer recycled newsprint. Non-toxic additives are applied to the uniquely fiberized paper generating a building material with superior thermal and acoustic properties, as well as exceptional resistance to fire, moisture, mould and pests.

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