UNITED ASSOCIATION LOCAL 300
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UA Local 300 Signatory Mechanical Contractors

​The four offices of Local 300, and their respective mechanical contractors associations work together to give the customer the best possible service. Productivity is proven to be higher and results are consistently more satisfactory with union labor. Cambridge Massachusetts National Bureau of Economic Research conducted a study which found union construction workers to be 31% to 51% more efficient on retail and commercial buildings than non-union workers and the United Association sets the standard when it comes to industrial projects in the United States and Canada. Local 300 is very proud of its relationship with its signatory contractors and we look forward to many more years of this mutually beneficial relationship. Following is a list of the current UA Local 300 signatory mechanical contractors.​
Air Mechanical Inc
West Fargo, ND 
701 277-8061
 
August Winter & Sons
Appleton, WI 
920-739-8881
 
Azco
Appleton, WI
920 734-5791
 
Babcock & Wilcox
Akron, OH 
330 860-6394
 
Burnn Boiler & Mechanical
Fargo, ND 
701 318-8604
 
City Air Mechanical
Bismarck, ND 
701 223-3775
 
Cooling & Htg Unlimited
Bismarck, ND
701 223-8260
 
Corval Group
St Paul, MN
651 645-0451
 
Daikin Applied
Plymouth, MN
763 428-1700
 
DCT, Inc
McAlester, OK 
918 426-5902
 
Dirk Plb & Htg
Mandan, ND
701 663-3671
 
El-Jay Plumbing & Heating, Inc
St. Cloud, MN
320 251-8330
 

Harris Mechanical Contracting Co
St Paul, MN 
651 602-6500
 
Honeywell
Golden Valley, MN 
763 954-4489
 
Hussmann Corporation
Bridgeton, MO
314 291-2000
 
Industrial Contractors, Inc (ICI)
Bismarck, ND 
701 258-9908
 
Inglett & Stubbs
Smyrna, GA 
404 817-2313
 
Johnson Controls Inc
Milwaukee, WI 
800 333-2222
 
Map General Mechanical Con.
Sanford, MI
989 496-3456
 
Metropolitan Mech. Con. (MMC)
Eden Prairie, MN 
952 941-7010
 
Mowbray Plumbing & Heating
Minot, ND
701 852-1491
 
NorMinn Industrial
Clearbrook, MN
218 776-3875
Peterson Mechanical
Fargo, ND 
701 293-7201
 
Peterson Sheet Metal
Bemidji, MN 
218 751-4502
 
Pioneer Power, Inc
Woodbury, MN
651 488-5561
 
Precision Mechanical, Inc
West Fargo, ND
701 282-4020
 
Quality Underground Services (Q3)
Little Canada, MN 
651 224-2424
 
R.M. Cotton Co.
Brooklyn Park, MN 
701 532-3040
 
Robert Gibb & Sons
Fargo, ND 
701 282-5900
 
Schwab-Vollhaber-Lubratt Service Corp
St Paul, MN 
651 481-8000
 
Simoneau Sterling
Hudson, WI 
651 280-8702
 
Stainless Specialists, Inc
Wausau, WI
715 675-4155
 
Tessiers, Inc
Sioux Falls, SD 
605 336-3175
 
Walts Plb & Htg
Bismarck, ND
701 222-2682
 
Wrigley Mechanical
Fargo, ND 
701 277-8570
​
​UNITED ASSOCIATION LOCAL 300 - PLUMBERS AND PIPEFITTERS
NORTH DAKOTA AND EASTERN SOUTH DAKOTA
Email UA300
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