Business Details
50+ Years
experience
Family-Owned Roofing Experts in Cortland, IL
Founded in 1971, Theisen Roofing & Siding Co. has been a trusted provider of professional roofing services in Northern Illinois for over five decades. As a family-owned and operated business, we take pride in delivering quality craftsmanship in residential roofing, siding, and seamless gutters while maintaining the highest standards of professionalism. Our team of experienced roofers, including third-generation owners Jeff and Brian Theisen and their nephew Eric, ensures every project reflects our commitment to excellence. With an A+ rating from the Better Business Bureau and certifications from industry leaders like CertainTeed and Malarkey, we prioritize customer satisfaction through personalized service and durable solutions.Our dedication to local communities, spanning DeKalb County and surrounding areas, has allowed us to build lasting relationships with clients, many of whom return for repeat services after decades. By avoiding subcontractors and maintaining a skilled in-house crew, we guarantee consistent quality and accountability on every project, from small repairs to full roof replacements.
Services
Roofing
Siding
Gutters
Repairs
Seamless Gutters
Details
- Year established: 1971
Highlights and features
- Family-owned since 1971 with three generations of roofing expertise
- No subcontractors all work completed by our experienced in-house team
- Certified installers with extended warranties for all projects
- A+ rating from the Better Business Bureau since 1993
- Decades-long relationships with local homeowners and communities
Associations and certifications
- Better Business Bureau
- CertainTeed
- Malarkey Roofing Products
Services
Roofing
We provide comprehensive roofing solutions including tear-offs, reroofing, and repairs for residential properties. Our certified installers use premium materials from brands like CertainTeed and GAF to ensure long-lasting protection. With over 50 years of experience, we deliver expert craftsmanship for both minor fixes and complete roof replacements.
Siding
Our siding services cover repairs, replacements, and installations using vinyl, cedar, and aluminum materials. We specialize in window wrapping and soffit/fascia upgrades to enhance curb appeal while improving energy efficiency. Our team ensures precise installations that protect homes against Northern Illinois weather conditions.
Gutters
We custom-manufacture 5 and 6-inch seamless aluminum gutters in over 20 color options to match any home aesthetic. Our gutter solutions include aluminum soffits, fascias, and repair services that prevent water damage. Each installation is designed for optimal drainage and durability in local climate conditions.
Repairs
From emergency leak fixes to scheduled maintenance, our repair services address roofing, siding, and gutter issues promptly. We prioritize rapid response times and long-term solutions using industry-certified techniques. Our team ensures all repairs maintain the structural integrity of your home.
Seamless Gutters
Our seamless gutter systems eliminate leaks through continuous aluminum construction tailored to your home's specifications. Available in multiple colors, these low-maintenance solutions provide efficient water management while enhancing exterior aesthetics. We guarantee precise measurements and professional installations for lasting performance.
People
Jeff Theisen
Co-Owner
Jeff Theisen joined the family business in 1978, bringing decades of hands-on roofing experience. As co-owner, he oversees daily operations and ensures every project meets Theisen's quality standards.
Brian Theisen
Co-Owner
Brian Theisen has been with Theisen Roofing since 1989, contributing his expertise in residential roofing solutions. As co-owner, he focuses on customer relations and maintaining the company's commitment to excellence.
Eric Theisen
Third Generation Roofer
Eric Theisen represents the third generation of Theisen roofers, joining the company in 2010. He specializes in modern roofing techniques while upholding the family's traditional values of quality and service.
Questions
What services does Theisen Roofing & Siding offer?
We specialize in residential roofing, siding, seamless gutters, and related repairs. Our services include roof replacements, vinyl/cedar/aluminum siding installations, and custom gutter systems.
Are you certified by roofing material manufacturers?
Yes, we are certified installers for CertainTeed and Malarkey Roofing Products, qualifying us for extended warranties on our installations.
Do you serve areas outside DeKalb County?
While based in Cortland, we serve all of Northern Illinois including Sycamore, Genoa, and surrounding communities for residential roofing projects.
How long has Theisen Roofing been in business?
We've been family-owned and operated since 1971, providing roofing services for over 50 years with three generations of experienced roofers.
What makes your company different from other contractors?
We're a local, family-owned business with an A+ BBB rating that uses only in-house crews – no subcontractors – ensuring consistent quality and accountability on every project.
