Key Construction Group is a licensed ILLINOIS DEPARTMENT OF PUBLIC HEALTH Plumbing Contractor 
Bonded and Insured

Proud UA Local 130 & 597 Union Contractor

It may not sound important, but licensed plumbers protect your drinking water from contamination!

Proudly serving Northern Illinois!

Plumbing - Backflow Testing - Pipefitting - Hydronic Heating

Plumbing and Piping Construction Contractor 

We specialize in new construction. 


Backflows/ RPZs


Backflows protect your health! Only plumbers with CCCDI certification can work on them. All Key employees are certified!

Plumbing Repair


Water's an essential ingredient to life, but when you have a problem with it, it's the last thing you want.

Call: 815-695-5352

It is simple, our whole staff is licensed!

At Key Construction Group,

we only have licensed plumbers. 

No corner cutters here!

  • Every member of our staff has been through a rigorous 5 year apprenticeship schooling program to learn all angles of the plumbing trade.
  • Every member has passed the Illinois Department of Public Health State Plumbing Exam and carries a current Illinois Plumbing License.
  • Every member is licensed to work on Backflow Assemblies! Our entire staff has also completed additional training to obtain a Cross Connection Control Device Inspectors License.