Our triple glazed window ranges are available in two types of frame, two depth options and all ranges can be inward or outward opening.
The frame material can be Timber or Aluminium Clad Timber. *78 or 98 refers to the depth of the window frame. A- refers to the aluminium clad options.
Our GBS78 and GBS78-A ranges are suitable for most projects, from replacement right through to deep retrofits and low energy new builds.
Our GBS98 and GBS98-A ranges are Passivhaus suitable and can be used in projects seeking certification.
All of our windows are third party tested for security, air tightness and exposure and all U values are backed up with PHPP ready data and calculation reports. All the timber we use is responsibly sourced through FSC® certification.