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

Proud UA Local 130 & 597 Union Contractor

Proudly serving Northern Illinois!

Plumbing and Piping Construction Contractor 

We specialize in new construction. 


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.

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

Plumbing - Backflow Testing - Pipefitting - Hydronic Heating

Backflows/ RPZs


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