Dachfenster Keller GmbH — Im Buck 20, 8478 Thalheim an der Thur, Switzerland

Perfekter Service und sehr professionell!

Lara Wolf

Stresserfirma.

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Ausgezeichnete Arbeit!! Ich bin mit der Installation und dem Service meiner neuen Oberlichter sehr zufrieden. Die Mitarbeiter arbeiten sehr präzise und sauber und sind zudem unglaublich freundlich. Absolut empfehlenswert, wenn Sie Professionalität, Präzision und Qualität wünschen.

Luca Paolillo

Five skilled workers replaced all the skylights in one day. Some of the work had to be done in very difficult-to-access locations. Everything was finished by 4 p.m. The old windows were gone, the rooms were cleaned, and even the stairwell was spotless. I was able to fully enjoy my evening. I can only say, "THE BEST EXPERIENCE I'VE EVER HAD WITH TRADESPEOPLE." Many thanks to the hardworking men. Susanne B.

Susanne Bernardi

We had our Velux roof windows replaced by Keller GmbH. Everything went perfectly from start to finish. Excellent! Competent advice, professional service, friendly and clean work by the installers Daniel & Michael. We can highly recommend Keller GmbH.

Doris Gillard

I have Roto roof windows (luxury version). Technically challenging, but top-quality products, and I value them very highly. While looking for a suitable partner for sales/service, etc., your company was highly recommended to me. I received prompt service, and they were very competent, friendly, and courteous. You can tell that these employees still put a lot of heart and soul into their work and conduct themselves in an exemplary manner. A Mr. Bojan was on-site and exceeded all previous expectations! Simply unique and highly recommended; thank you very much. Be proud of this exemplary company and keep up the good work!

Markus Kaufmann