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 almost 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 inground pools and docks.