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License Number: 104-000554


All photos are examples of our work, check out the gallery for more.


About Us

Locally owned and operated since 1971, Theisen Roofing & Siding has been providing quality, professional roofing services and more for generations. Third generation roofers, owners Jeff and Brian Theisen took on the family business from their father Ray. Today, Theisen Roofing has a team of experienced roofers who, together, provide quality workmanship on every project.


Over our decades of experience in the industry, we’ve worked hard to build and maintain relationships with our customers. For some, we’ve re-roofed their home and been able to come and re-roof their home again 25 years later. It’s this commitment to our customers that has helped us thrive over the years and we are dedicated to continuing the tradition of customer service, along with the highest standard of work and professionalism.


We Are Members Of:


Better Business Bureau since 1993  •  Dekalb Chamber of Commerce   •  US Chamber of Commerce  •  Sycamore Chamber of Commerce  •  Genoa Chamber of Commerce

The Theisens at our original facility in DeKalb.

Our new facility in Cortland.

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