Koartis GmbH

Excellent employee sense of responsibility, goal orientation, and efficiency. Two years of working together demonstrate our satisfaction. We would definitely recommend them!! A big thank you!

...great.... I don't usually write reviews...but with such good service, I'll make an exception. Everything was top-notch... From the initial consultation to the adherence to deadlines and punctuality...at a good price... Keep it up...it couldn't be better. BO

This company deserves more than 5 stars! Koartis completed all the roofing work for our attic conversion (slate roofing, roof terrace construction, downpipes, skylights, etc.) to our complete satisfaction. From the very beginning, the quote, billing, and communication were transparent, and the two brothers had a solution for every problem. They were always available and immediately on-site, even in emergencies. We are simply grateful to have found such reliable and competent roofers and would hire this company again without hesitation. Thank you for your tireless patience and perseverance on

It's become rare to find tradespeople who truly understand their craft, are perfectly organized, and possess excellent communication skills. Koartis GbR left nothing to be desired, from the planning stage to final completion. We had our flat roof completely renovated to improve its energy efficiency. Even our special requests (three core drillings for the photovoltaic system's cable routing, a chimney, and a range hood) were implemented flawlessly. After consulting with them, we opted for a special membrane with state-of-the-art tapered insulation instead of tar paper. The advantages convince

Complete roof work, including new insulation, with beautiful panoramic windows. The arrangements worked out very reliably and on short notice. The neighbors also praised the fast, reliable, and clean work.