Build Commercial Infrastructure with Precision and Care

From excavation to final construction, every phase is handled with experienced crews and specialized equipment.

Support Large-Scale Development with Full-Service Civil Work

Infrastructure built right, with documented steps and steady oversight

Gillan Construction LLC brings full-service commercial construction to the Illinois Valley and the surrounding region, with a focus on heavy civil and infrastructure projects that require precision from the ground up. Whether you're managing a municipal contract or a private development, you need a contractor who understands the scope and scale of the work involved. Our team handles excavation, foundations, concrete, underground utilities, and bridge construction—all delivered with the equipment and expertise your project demands.

You'll know what to expect at every stage, from site preparation through final construction. We coordinate directly with project managers and municipalities, so timelines stay clear and your crews stay informed. When you're working across multiple phases or managing a long-term build, having a contractor who keeps pace with the schedule makes a measurable difference in how smoothly your project moves forward.

Gillan Construction LLC supports every phase of commercial development with a direct approach and a crew that's worked through complex civil projects before. We're licensed, bonded, and insured, and we take the same care with a curb installation as we do with bridge work or pile driving. You get results that meet code and hold up over time.

Reach out to discuss your project—we're ready to walk through your scope and timeline.

Deliver Heavy Civil Projects That Meet Standards

Code-compliant results backed by safe practices and direct experience with government contracts.

How Civil Projects Unfold from Start to Finish

When you're coordinating a commercial build or municipal infrastructure project, knowing who's handling what—and when—keeps the entire job on track. We work directly with you to clarify scope, equipment needs, and phasing before crews arrive on site. You'll have a clear understanding of how excavation ties into utilities, how concrete schedules align with site access, and what documentation is required at each milestone. That level of coordination matters when inspections, permits, and contractor handoffs all need to happen in sequence.

Every phase is managed with attention to safety protocols and code compliance. From demolition and pile driving to sanitary sewer installation and bridge construction, our crews follow documented procedures that keep the work predictable and the site secure. You won't be left guessing where things stand or what's coming next.

Here's what working with a full-service civil contractor makes possible:

• Excavation, foundation, and concrete construction handled by the same experienced team
• Underground utility installation for storm drainage, water main, and sewer systems that meet municipal standards
• Pile driving and bridge work managed with specialized equipment and trained operators
• Site preparation and demolition across the Illinois Valley area and a sixty-mile service radius

If you're planning a project in, let's talk through your site conditions and project goals.

Dependable Performance Across Complex Builds

Gillan Construction LLC has worked on government contracts and large-scale private developments, so we understand what it takes to deliver on time and within spec. The Illinois Valley's commercial growth depends on contractors who show up prepared, follow through on commitments, and don't cut corners when the work gets complicated. Our reputation is built on doing exactly that—whether it's a curb and sidewalk installation or a multi-phase infrastructure project that spans months.

You can count on crews who respect the scope of the job, equipment that's suited to the task, and a company that stands behind its work. We're bonded and insured, and we treat every project with the same level of accountability. When deadlines matter and quality can't be negotiated, you need a contractor who's built to handle both.

For safe, efficient, and code-compliant results on your next civil or infrastructure project, call Gillan Construction LLC- we'll provide a straightforward assessment and a plan that works.

Areas We Serve