The KELLER guarantee: technically mature and functional as well as visually impressive with own design touch

One of KELLER AG's particular strengths is system maintenance. Even good products have to be optimised continually. The exchange of experience between the internal departments helps here, along with the global sales partner network and national and international architects. KELLER AG concentrates in particular on system maintenance and quality management.
This guarantees reliable function and durability.

Guarantee certificate

KELLER AG guarantees the durability and function of the KELLER construction as well as the performance of the surface refinement. Our know-how, the product conformity and quality controls guarantee top performance. Our experts give you security

The KELLER guarantees apply to:

  • construction, stability and sealing
  • Surface refinement
  • Mobile and mechanical parts
  • Electrical components
  • Glass


Approval and certification of the products stand at the end of every development. KELLER AG's products are assessed according to European standards. They are held in high regard both nationally and internationally. In order to test the standardised properties promptly during the course of the development phase, KELLER AG has installed its own window test stand that enables the testing of window and façade elements up to 6 m in width and 4.5 m in height. Air permeability is measured; extreme rain and wind speeds of over 300 km/h can be generated. Project-specific special conditions can also be simulated.

Brand awareness

Satisfied customers confirm a genuine trusting relationship with KELLER AG. They experience the design and realisation of their construction project as a real privilege. They search specifically for the branded product KELLER. At national and international trade fair appearances we aim to achieve a constantly outstanding representation of the KELLER trademark and the registered products. Its success and position as a trendsetter obligate KELLER AG to continuously re-invent itself and its products. Apart from elaboration and planning, plus quality and service, we attach the greatest importance to guarantees for our customers.

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