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About Gillan Construction, LLC

When you choose Gillan Construction, LLC you are choosing a second-generation, family owned and operated business. We have been serving greater Illinois for over 30 years under the name of AWSS – Area Wide Septic Service. Now under the umbrella of Gillan Construction, we have expanded our services to meet even more needs of our residential, commercial and municipal customers.

Gillan Construction specializes in turn-key site preparation, including clearing, underground utilities, and grading. We handle commercial and residential developments of most any scope and size. Gillan Construction provides infrastructure development for a number of different applications, including residential and commercial use, roads, parking lots, sanitary sewer systems, water service systems, flood control systems, pump stations, shoreline stabilization, residential and commercial certified septic tank installations, and underground utility installations. We also install fiberglass in ground pools and docks. Check out our service pages to learn more!

What sets Gillan Construction apart is the attention to detail on every project. Whether it is a fiberglass inground pool installation or a city block sewer installation, we will make sure we are on time and on budget!

Serving Greater North Central Illinois’

highly recommended



Call Now! 815-559-2088