Product / Service Summary

Plug and Play solution for increasing energy efficiency of old windows.


Later Stage




Windows with unsufficient glazing and thus poor insulation effects are the weak spot of any older houses.

Up to 50% of a real estates losses in energy efficiency are due to obselecent windows. New windows are quite expensive though. X-Windows delivers a modular solution consisting of a revolutionary foil to be mounted on the old windows improving efficiency by up to 70%!


Patented innovation.

X-Window Team Members

Startbase Data

Added: 26.02.2019
Updated: 30.08.2019
  • Validated team members on Startbase
  • Registered at a German Handelsregister
  • Headquarter located in Germany
  • Scalable Business Model
  • Innovative Business Model


We deliver the greatest technical revolution in the window-business since glass was invented.
  • 2016
  • 1-10 Employees
  • X-Window GmbH
  • Handelsregister
  • Berlin, DE