Patio Doors

Branch Locations
Express Trade Windows currently has 1 depot, with more planned before the start of 2022.


Alitherm windows and doors have been designed to reduce heat loss by the use of a thermally broken aluminium frame with a polyamide bridge.

We offer three ranges of aluminium windows and doors:

  • The Alitherm 300 range which offers slim sightlines, chamfered edges and a square bead – available as an A energy rated window.
  • The Alitherm 600 range, offers a more ornate finish with an ovolo finish to the external edge of the sash and outer frame. With a frame width of 59.5mm and frame to bead depth of 84.5mm the window is available as a B rated energy window
  • We also offer the Evolution range of windows which has been specially designed as a thermally broken direct replacement for old steel windows. It is ideal for listed buildings or where planning constraints are to be considered.

Energy Ratings

28mm double glazed units giving an overall u’value of 1.8 W/m2 K


All our aluminium products are available in a wide range of colours, from standard KL range and RAL colours through to the exclusive Sensation range.

Colours Available

We have a range of colours available in this product. See below for our colour options: