Strong partners

In Flex windows we believe in quality. To ensure that we deliver consistently the best products, we’ve chosen ROTO, one of the largest and best German suppliers for our window and door hardware. We also work together with other German brands.

German Engineering and Technology

Flex Windows doors and windows come with the most refined German technology available today. Years of research and extensive testing have gone into our products. Features such as a multi-point locking system are standard across our line and offer increased security and tightness of the windows and doors.

AIT50 Profile with thermal break and Tilt & Turn ROTO Hardware

Unparalleled attention to detail

German brands combined with superior craftsmanship and Flexwindows quality control guarantee that you will get a product that brings satisfaction and lasts for many years to come. Every single window and door is custom made and fit to your individual needs, project location and budget. Our priority is to deliver an outstanding product. To make sure we consistently reach our goal, every window and door goes trough several steps of quality control before the final delivery to our clients. That way we can make sure that you’re getting what you expect – The best, Flexwindows Quality.

Flexwindows and door frames are engineered by REHAU using only the highest quality uPVC (Unplasticised Polyvinyl Chloride). This uPVC has been specially formulated for the harsh climate here in Qatar and together with the very high standards of manufacture that we at Geothermal pride ourselves on, this produces a superior quality product for your home. That's why all our windows and doors come with a 10 year guarantee.