Warm, secure and beautiful

The Crystal range of thermally efficient PVC-U/aluminium hybrid (WarmCore) residential doors are available in a traditional French door and a single door style, ideal for keeping a consistent look with the bi-fold door system.

Built to the same exacting standards as the larger doors, this range gives you all the benefits of warm aluminium, at a more modest size.

Download the WarmCore Door retail brochure below or visit the download page where you can download a huge range of brochures and technical guides.

WarmCore retail brochure draft v4_Page_01

Features and benefits

  • PVC-U thermal core
  • Superior thermal performance - U value of 1.4 W/m2K with 28mm double glazing and 1.0 W/m2K with 44mm triple glazing
  • Slim sightlines
  • Idea for residential and commercial building applications
  • Door leaves are triple sealed to eradicate draughts and ensure excellent weathertightness
  • PAS24 and Secured by Design compatibility
  • Easy to install - click here for an installation video
  • Four class aesthetic styles available: pencil round, chamfered, square and decorative
  • Available in a choice of 4 colours: white, cream black and grey
  • Flexible threshold options


Crystal offers a range of colour options and all of these choices are available in dual colour specification. All colours shown below are a guide. Before making your final decision please ensure you have seen a sample.


wc bi 7

wc bi 6

wc bi 5

wc bi 4

wc bi 3

wc bi 2

wc bi 1

Crystal Direct doors boast
huge benefits

  • Warranty

    Warmcore bi-folds come with a 10 year manufacturer's warranty

  • Energy efficiency

    Marketing leading thermal performance due to PVC-U core

  • Security

    PAS24 and Secure By Design compatibility as standard provides peace of mind for end users

  • Quality

    Manufactured to the highest quality standards, fully accredited and CE 

  • Recycling

    End of life PVC-U products are given a new lease of life via recycling

Crystal directAccreditations

To find your local supplier use the search box below to get
a list of Crystal approved and Platinum partner
supplier locations
within your area.