High Quality UPVC Windows

O70 Gold® is a 5-chambered, highly energy efficient, ovolo window and door system, that’s been designed specifically for the UK market. With the option of a number of foiled finishes from stock, there’s a wide range of choice to suit any project

Like all of our window and door systems, they are packed with innovative product features. The 5 chambered design is far more energy efficient than the 3 chambered designs of yesteryear, resulting in better performance and and a stronger product. With Building Regulations planned to change again in the near future, our PVCu window and door systems will lead the way.

With over 40 rich colours and realistic woodgrains, there are a huge number of finishes in which to enhance your property, making it a feature on any home, apartment or commercial property.


  • High Quality Kommerling Profile - engineered in Germany!

  • Glazed with high performance 'A' Rated double glazing as standard 

  • high security locking mechanisms

  • Low line gaskets and weatherseals provide lasting performance and slimmer sightlines

  • The full depth, central eurogroove helps make the windows and doors more secure

  • Five chambered system is more energy efficient than the three chambered designs from many of our competitors

  • Steel reinforcement is used where needed, to add additional structural strength

  • The ‘ovolo’ design of O70 Gold® shows off soft sculptured lines in the frame, sash and glazing bead

  • Single leg glazing bead is highly secure and easy to install on site

All installations carried out by Castle Mews Windows will come with a building control certificate and a full 10-year guarantee.

View Our Gallery

why not take a look at some of our recent installations to give you some inspiration 

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Download a Brochure

Kommerling Window Brochure (pdf)