Business Details
22 Years
experience
Emergency
services
Trusted Roofing & Siding Experts in McHenry, IL
Gen Ex Construction, established in 2004 by Paul Antonou and David Johnson, has built a reputation as McHenry County's premier exterior renovation provider. Our team of licensed professionals brings over 15 years of combined experience in residential and commercial roofing, siding, and gutter solutions. We maintain strict safety protocols including job site protection, documentation of pre-existing conditions, and comprehensive checklists for every project. As an Owens Corning Preferred Contractor, we combine industry-leading materials with personalized service to ensure lasting results.Our commitment to quality is underscored by a 10-year workmanship warranty and a 24-hour emergency hotline for urgent storm damage needs. We work directly with insurance companies to maximize client reimbursements while maintaining transparent communication throughout the process. Our A+ BBB rating and Google Guaranteed status reflect our dedication to customer satisfaction, with financing options available for qualifying projects. Through community involvement and military/veteran discounts, we continue to serve our local area while maintaining a 5-star rating across multiple review platforms.
Services
Roof Repair
Siding Installation
Gutter Replacement
Storm Damage Remediation
Commercial Roofing
Insurance Claim Assistance
Emergency Services
Exterior Renovations
Multi-Unit Projects
Financing Options
Details
- Year established: 2004
Highlights and features
- 15+ years of local exterior renovation expertise
- Google Guaranteed with verified background checks
- A+ rating with Better Business Bureau
- 24/7 emergency storm damage response
- 10-year workmanship warranty included
Associations and certifications
- Google Guaranteed
- Better Business Bureau
- Owens Corning Preferred Contractor
What people say
Prompt, professional service
Knowledgeable, responsive staff
Excellent cleanup
Transparent process
Timely completion
Services
Roof Repair
Our residential and commercial roof repair services address hail damage, leaks, and storm-related issues using premium Owens Corning materials. With 24/7 emergency response and insurance claim assistance, we ensure rapid restoration while maintaining structural integrity. Our team provides detailed inspections and transparent pricing for both residential and commercial properties.
Siding Installation
We offer comprehensive siding repair and replacement solutions for storm-damaged properties. Our licensed professionals handle insurance coordination and provide durable, weather-resistant installations. The service includes material selection guidance and precise installation techniques to enhance property value and energy efficiency while maintaining aesthetic appeal.
Gutter Replacement
Our gutter solutions prevent water damage through proper drainage system installation and repair. We address clogs, misalignment, and storm damage while ensuring proper soffit and fascia integration. The service includes material selection and precise installation to protect foundations from water intrusion while maintaining property aesthetics.
Storm Damage Remediation
Emergency storm damage services cover roof, siding, and gutter restoration with 24/7 availability. We document damage, coordinate insurance claims, and provide temporary protection measures. Our rapid response team uses specialized equipment to secure properties and prevent further damage while maintaining detailed documentation for insurance purposes.
Commercial Roofing
Specialized commercial roofing services handle multi-tenant properties, industrial buildings, and retail spaces. We offer TPO flat roofing solutions and complete system replacements with minimal business disruption. Our team works directly with property managers to coordinate large-scale projects while maintaining compliance with commercial building codes and insurance requirements.
People
Paul Antonou
Co-Owner
Co-founder with 20+ years in exterior construction, overseeing project execution and quality control. Prioritizes hands-on involvement in complex installations and customer relations while maintaining industry safety standards.
David Johnson
Co-Owner
Co-founder managing operations and team development, with extensive experience in commercial roofing projects. Ensures compliance with licensing requirements and maintains relationships with material suppliers like Owens Corning.
Greg
Project Manager
Senior estimator with expertise in insurance claim navigation, providing transparent assessments and repair options. Handles customer consultations and coordinates emergency service dispatch for storm-damaged properties.
Questions
What areas do you service?
We serve McHenry County and surrounding areas including Fox Lake, Crystal Lake, Cary, and Huntley, with emergency services available 24/7.
Do you work with insurance companies?
Yes, we handle insurance claims directly, including documentation and adjuster coordination to maximize your coverage benefits.
What warranties do you offer?
We provide a 10-year workmanship warranty covering labor errors, with material warranties handled through manufacturers like Owens Corning.
Are financing options available?
Yes, we offer financing programs for qualifying projects to help manage exterior renovation costs.
How quickly can you respond to emergencies?
Our 24/7 emergency service typically responds within 2 hours for storm damage situations across Northern Illinois.
Are you licensed and insured?
We maintain full licensing and insurance coverage as required by Illinois regulations for residential and commercial exterior contractors.
Videos
Reviews (4)
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.
Tom D.
Oct 12, 2020
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Positive:Professionalism,Punctuality,Quality,Responsiveness,Value
The company did a great job. They completed the work in a timely manner as promised. I would highly recommend them.
Service:Roof installation
The company did a great job. They completed the work in a timely manner as promised. I would highly recommend them.
Service:Roof installation
