Design-Build Construction Services
Hartwig Mechanical delivers turnkey design-build construction with single-source accountability and custom mechanical solutions.
Over 65 years of experience
Turnkey Design-Build Construction Services That Deliver Real Results
Hartwig Mechanical provides full-scope design-build construction solutions tailored to complex mechanical systems. For more than 65 years as top-quality design-build contractors, we’ve aligned our services with your end goals to ensure seamless, efficient, and performance-driven results.
Custom Metal Fabrication
Our precision-built structural and mechanical components are customized to meet the exact demands of your facility.
Ventilation System Servicing
Hartwig Mechanical provides complete HVAC design and air distribution solutions built to support airflow, function, and comfort.
Our Partners
We Offer a Smarter Path From Design to Delivery
Hartwig Mechanical’s general construction process starts with a comprehensive onsite assessment. We evaluate your current systems, meet with your team, and align our mechanical design approach with your operational goals. From there, we handle design and coordination under one roof, reducing delays, change orders, and miscommunication. Our in-house experts and experienced field crews work together to deliver a system that fits your space, giving you one point of contact, clear accountability, and a system that’s built to function, perform, and last.
24/7 service response
Two dedicated offices
Skilled field crews and plumbing engineers
VDC team support
Commitment to jobsite safety
Industries We Serve
Manufacturing
We design mechanical systems that meet production demands with efficiency, functionality, and full operational integration.
Multi-Family Properties
Our turnkey MEP solutions bring energy-efficient heating, ventilation, and plumbing to large residential projects.
Healthcare and Medical Facilities
Hartwig Mechanical specializes in precision ventilation and layout coordination for critical spaces where air quality, flow, and zoning matter most.
Education
Schools and campus facilities benefit from our streamlined construction process and high-performing mechanical systems.
Public Facilities
Our reliable, scalable mechanical solutions are tailored to municipal and community-driven infrastructure.
Retail and Hospitality
We develop systems that quietly and efficiently support occupant comfort and back-of-house operations.
Cold Storage and Processing Plants
Our solutions maintain precise environmental control with built-in energy efficiency and long-term performance.
Testimonials / Success
Fantastic service with quality work. Extremely professional. Arrived on time and took care of our problem quickly and efficiently. Our thanks to them.
Excellent service. I was referred to them by my friend. I couldn’t of been more pleased and at ease. Everyone I spoke with at Hartwig were kind and courteous.
Proudly Serving Northern Illinois
With offices in Harvard and Rockford, Illinois, Hartwig Mechanical provides design-build construction services across Northern Illinois and Southern Wisconsin. Our reach allows us to serve a wide range of facility types without compromising timeline, quality, or coordination.