Business Details
50+ Years
experience
Expert Roofing Contractors in Cortland, IL
Founded in 1971, Theisen Roofing & Siding Co. has been a family-owned and operated roofing company serving Northern Illinois for over five decades. Our third-generation leadership, Jeff and Brian Theisen, continues the legacy established by founder Ray Theisen, who began operations with a pickup truck and hand tools. With a team of experienced roofers and a 20,000-square-foot facility in Cortland, we specialize in residential roofing, siding, and seamless gutters using premium materials from brands like CertainTeed and GAF.Our commitment to quality craftsmanship and customer relationships has earned us an A+ BBB rating since 1993 and membership in multiple local and national chambers of commerce. We maintain long-term client trust through consistent service delivery, having re-roofed homes for multiple generations of customers in DeKalb County and surrounding areas.
Services
Roofing
Siding
Gutters
Repairs
Seamless Gutters
Details
- Year established: 1971
Highlights and features
- Family-owned since 1971 with third-generation leadership
- Direct employment of experienced crew members for over 20 years
- No subcontracting ensures consistent quality standards
- Certified installers with extended warranty options
- Free estimates for all residential roofing projects
Associations and certifications
- Better Business Bureau (BBB)
Services
Roofing
We provide comprehensive roofing solutions including tear-offs, reroofing, and repairs for residential properties. Our certified installers use premium materials from CertainTeed and GAF, offering extended warranties. With over 50 years of experience, we ensure durable installations that protect homes in Northern Illinois against weather extremes while maintaining aesthetic appeal.
Siding
Our siding services cover vinyl, cedar, and aluminum options with complete installation and repair solutions. We handle soffit/fascia replacement and window wrapping to enhance home exteriors. Using high-quality materials and proven techniques, we improve energy efficiency and curb appeal while addressing damage from weather or aging for homes in DeKalb County and surrounding areas.
Gutters
We custom-manufacture seamless aluminum gutters in over 20 color options to match home aesthetics. Our 5 and 6-inch systems with soffit and fascia components provide effective water management. With professional installation and repair services, we protect properties from water damage while maintaining the longevity of roofing systems across Northern Illinois.
People
Jeff Theisen
Co-Owner
Joined the family business in 1978, bringing over 45 years of roofing expertise. Third-generation roofer committed to maintaining quality standards and customer relationships through hands-on leadership in Cortland operations.
Brian Theisen
Co-Owner
Has dedicated 35+ years to the company since joining in 1989. Oversees daily operations with focus on technical excellence and ensuring consistent application of industry best practices across all projects in Northern Illinois.
Eric Theisen
Team Member
Third-generation team member since 2010, contributing to project execution while learning from decades of family experience. Represents the future leadership of this long-standing DeKalb County roofing company.
Questions
What services does Theisen Roofing offer?
We specialize in residential roofing (tear-offs, reroofing, repairs), siding installation (vinyl, cedar, aluminum), and custom seamless gutters. Our services also include soffit/fascia replacement and window wrapping for homes in Northern Illinois.
Are you BBB accredited?
Yes, we've maintained an A+ rating with the Better Business Bureau since 1993, reflecting our commitment to ethical business practices and customer satisfaction in all roofing projects.
Do you offer financing options?
While we don't directly provide financing, we can discuss payment arrangements and help connect homeowners with trusted financing partners for major roofing projects in DeKalb County.
What areas do you serve?
We primarily serve DeKalb County and surrounding communities in Northern Illinois, including Cortland, Sycamore, and Genoa, with over 50 years of local experience and knowledge.
Do you handle emergency repairs?
We recommend contacting us during regular business hours for urgent roofing concerns. Our team prioritizes prompt response for storm damage and critical roof integrity issues in Northern Illinois.
How long have you been in business?
Founded in 1971 by Raymond Theisen, we've provided continuous roofing services for over 50 years as a family-owned company with three generations of leadership in Cortland.
