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Our History

We know what counts and our history backs that up.

We certainly have staying power — more than 100 years of it, if you’re counting. We are.

In fact, that’s one of the reasons we’ve grown from Walker Jamar Sr.’s initial $500 investment to a multimillion-dollar company with a rich history.

Helping you make every dollar of your investment count.

Interestingly enough, before making his investment, Walker found work counting hours – as a timekeeper with A.H. Krieger, a Duluth, MN, pipe-covering firm. Learning the business, honing his skills and, most importantly, counting his savings, he bought the company five years later.

In 1985, APi Group, a St. Paul-based private holding company, brought us into the fold. Acquisitions since, such as Arrowhead Refrigeration, further enhance our capabilities and enriched our history of success.

But through it all, we stayed true to our founder and our history – making every hire, every estimate, every project, every conversation, every day – count.

Jamar historical image of man
Jamar historical image of machine
Jamar historical image of boat launch
100 Years Strong

For more than 100 years, Jamar has built a reputation as a solid partner delivering solid solutions.

  • Headquartered in Duluth, MN.
  • Main offices in Green Bay, Wis., Spooner, Wis., Escanaba, Mich., Lewiston, Idaho, Watford City, N.D., and Arden Hills, MN.

As an expert specialty contractor, we solve extraordinary challenges for our industrial and commercial customers and execute those solutions flawlessly. With all of our complimentary services housed under one roof, we can act as our customers’ sole source solution provider.

Our customers consider us the premier provider in our areas of expertise because:

  • We believe safety is non-negotiable.
  • We hire only the best people, then empower them to do great work.
  • Our experts are closely aligned, bringing synergy to every project.
  • We create true partnerships with our customers by understanding and meeting their needs.
  • Our pursuit of excellence is tireless – we will never stop striving to get better at what we do.


AH Krieger Company was purchased


Walker Jamar Company was established


Additional operations under the Jamar Olmen name


Opened branch offices in Chicago, Kansas City & Houston


Renamed The Jamar Company


Acquired by APi


Acquired Asdco Distribution


Acquired Arrowhead Refrigeration Arrowhead Mechanical & Sonneman Constructor


Opened the Michigan operations of Jamar with acquisition of Pentecost Construction


Opened the Idaho operations of Jamar


Opened the Wisconsin operations of Jamar


Acquired Stout Mechanical


Asdco Arden Hills , MN, operations open


Asdco Watford City, ND, operations open


Asdco Spooner, WI, operations open


Asdco Shakopee, MN, operations open


Integrated Industrial Contractors Inc., an APi Group sister-company from Bismarck, ND, into our operations. Acquired CMS Mechanical Service in Windsor, CO.


Acquired Bartingale Mechanical Contractors in Eau Claire, WI.