Business Details
22 Years
experience
Emergency
services
Expert Roofing & Siding Solutions in McHenry
Gen Ex Construction has been serving McHenry County and surrounding areas since 2004, founded by Paul Antonou and David Johnson. Our team of licensed professionals specializes in residential and commercial roofing, siding, and gutter solutions with a focus on integrity and quality craftsmanship. We maintain strict safety protocols including job site protection, documentation of pre-existing conditions, and comprehensive checklists for every project. Our 10-year workmanship warranty demonstrates our commitment to long-term customer satisfaction, and we offer 24/7 emergency services for storm damage remediation.As an Owens Corning Preferred Contractor with an A+ BBB rating, we combine industry expertise with personalized service through every insurance claim process. Our Google Guaranteed status reflects our dedication to transparency, with background-checked professionals who never require upfront contracts. With over 15 years of local experience, we've built a reputation for prompt service, meticulous cleanup, and solutions tailored to both residential and commercial property needs.
Services
Residential Roofing
Commercial Roofing
Siding Repair
Gutter Services
Storm Damage Remediation
Insurance Claims Assistance
Emergency Roofing
Soffit & Fascia Repair
Details
- Year established: 2004
Highlights and features
- 15+ years of local roofing expertise since 2004
- Google Guaranteed background-checked professionals
- A+ rating with Better Business Bureau
- 10-year workmanship warranty on installations
- 24/7 emergency storm damage response
Associations and certifications
- Google Guaranteed
- Better Business Bureau
- Owens Corning Preferred Contractor
What people say
Prompt, professional service
Knowledgeable, responsive staff
Excellent work quality
Thorough cleanup process
Reliable emergency response
Services
Residential Roofing
Our residential roofing services include complete roof replacement, shingle repair, and storm damage restoration for single-family homes. We use premium Owens Corning materials with precise installation techniques that enhance property value and energy efficiency. Our team handles insurance claims directly while maintaining strict safety protocols to protect your property during the entire process.
Commercial Roofing
Commercial roofing solutions cover flat roofs, TPO membranes, and multi-tenant property maintenance for businesses in McHenry County. We specialize in minimizing operational disruption while ensuring code compliance and long-term durability. Our experts work directly with property managers to coordinate large-scale projects across retail centers, churches, and industrial facilities.
Siding Repair
Siding repair and replacement services address hail damage, wind destruction, and general wear while improving energy efficiency. We match existing materials precisely while offering modern upgrades that enhance weather resistance. Our process includes careful documentation for insurance claims and complete cleanup of job sites to protect landscaping.
Gutter Services
Gutter and soffit repair services prevent water damage through proper drainage solutions and debris-resistant systems. We install seamless gutters and address rot issues while maintaining structural integrity. Our maintenance programs help commercial and residential clients avoid costly water intrusion problems during Illinois' seasonal weather changes.
Storm Damage Remediation
24/7 storm damage response includes temporary roof protection, water extraction, and permanent repairs for hail, wind, and lightning damage. We coordinate directly with insurance companies to maximize claim coverage while providing same-day assessments. Our emergency crews maintain full equipment readiness for rapid response throughout northern Illinois.
People
Paul Antonou
Co-Owner
Co-founder with 20+ years in exterior construction, Paul oversees project execution and quality control. He established Gen Ex's safety protocols and maintains hands-on involvement in complex installations.
David Johnson
Co-Owner
Co-founder specializing in insurance claim navigation, David ensures transparent communication with homeowners. He developed the company's customer satisfaction guarantee and warranty programs for long-term client relationships.
Greg
Project Manager
Senior estimator with expertise in storm damage assessment, Greg coordinates residential projects from inspection to completion. He provides detailed insurance documentation and personalized client support throughout the renovation process.
Questions
What areas do you service?
We serve McHenry County and surrounding areas including Crystal Lake, Cary, Algonquin, and Woodstock. Emergency services extend throughout northern Illinois.
Do you handle insurance claims?
Yes, we work directly with all major insurance companies to document storm damage and maximize claim coverage for roof and siding repairs.
Are financing options available?
Yes, we offer financing programs to qualified homeowners for roof replacement and major exterior renovation projects.
What warranties do you provide?
We offer a 10-year labor warranty on installations and coordinate manufacturer warranties for roofing materials through Owens Corning.
Do you offer emergency services?
Yes, our 24/7 emergency team responds to storm damage situations with temporary protection and permanent repair solutions.
Videos
Reviews (5)
R.
Jan 26, 2022
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We had some hail damage and did not want to use the "storm chasers" to inspect the roof/siding. Called Gen Ex and Josh came out and worked with us and our insurance company to determine what needed to be done. Josh was exceptional throughout the process and even the claims rep was complimentary of the integrity and professionalism of Gen Ex (Josh). We had a new roof completed in a day on a large, complex roof and they took care to ensure that everything was accurate and the yard 100% clean. We will use Gen Ex again and would recommend them to anyone doing exterior work.
Janice Rhodes
Jun 28, 2021
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We worked with Brad on re-siding our house and window replacement. His recommendation on siding color was spot on! The black shutters are the perfect style and size. And the windows are beautiful. The house looks amazing and the neighborhood compliments keep rolling in. Thank you Brad and Gen Ex for a wonderful job!
Paul McKenna
May 31, 2021
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An accident in my garage resulted in one of my garage walls and exterior siding needing repair. Since GenEx had done my siding and roofing work last year, I called Greg on a Saturday afternoon and he and Paul came right over. They jumped on the job and had my garage back in great shape the same day! I highly recommend GenEx for high quality, fairly priced service. Thanks again to Greg and Paul!
Jeremy Shaw
Feb 02, 2021
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Positive:Professionalism,Punctuality,Quality,Responsiveness,Value
Great people to work with. Accommodated our personal choice of roofing, promptly completed the work and everything was done professionally. I highly recommend these guys.
Service:Roof installation
Great people to work with. Accommodated our personal choice of roofing, promptly completed the work and everything was done professionally. I highly recommend these guys.
Service:Roof installation
Tina Rebman
Nov 17, 2020
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We needed our garage roof replaced, and I can't explain how happy we are with the results. Our roof looks amazing, and Paul and his crew fixed everything that was wrong with it or that was not done correctly the first time, which was before we purchased the house. Great job and I highly recommend them. They were prompt, professional, and did the job before we thought they could even fit us in. We will definitely use them again if we need them.
