Commercial Plumbing, HVAC, Fire & Fabrication Services

Commercial contracting may seem like an easy task, but at A.G. O’Brien we know that every commercial job is unique to its property. There are plenty of commercial contractors but they are not all equal in terms of quality, reliability, and experience. Contact us directly to speak with one of our industry-leading contractors today.

Commercial Plumbing

  • Remodel
  • New Construction
  • water heater repair/replacement
  • tankless water heater repair/replacement
  • Faucet, shower, tub, toilet leaks, repair
  • and replacements.
  • RPZ testing, repair/replacements
  • Water/waste pipe repair/replacements
  • Water treatment
  • Water filtration
  • Sump pump install/repair/replace
  • Waste/grinder pump install/repair/replace
  • Booster pump install/repair/replace
  • Drain, snake/clog/removal

HVAC Services

  • Commercial heating
  • Cooling
  • Ventilation
  • Remodel
  • New construction
  • Heating/Cooling unit repair
  • Heating/Cooling unit service/tune up
  • Heating/Cooling unit replacement
  • Boiler
  • Furnace
  • Ductless mini splits for heating or cooling
  • Central heating & air conditioning
  • Humidification control
  • Air exchanger install/repair/service
  • Exhaust fans
  • Kitchen hoods
  • Steam equipment/system service

Fire Protection

  • Fire sprinkler system services
  • Engineering & Consulting
  • Installation
  • Fabrication
  • Inspection, testing & maintenance
  • 24hr emergency services

Metal Fabrication

Our extensive experience at A.G. O’Brien provides us with the capabilities to achieve all types of metal fabrication projects. We provide high-value custom components to all kinds of industries and work closely with our clients to guarantee 100% satisfaction with our services.


Office (218) 729-9662

Service Locations

Saint Louis County

Douglas County

Cook County

Carlton County

Pine County

Itasca County

Bayfield County