Ideal solution for medium to high construction projects

Crystal's fully reversible system meets the challenges of climate change head on with major design breakthroughs, which reduce heat loss and improve weather tightness. Windows meet Part L Regulations, plus security standard BS 7950 and egress requirements. Fully reversible windows are widely used for medium to high construction as the windows can be cleaned internally and externally from inside the property.

Twin weather seals are fused to the main profiles and are welded together at the corners ensuring a continuous homogeneous seal. This precision technology ensures exceptional air and water tightness. The profile design of the main sections has five independent chambers not the conventional three. This gives the profile greater strength and, importantly, enhances the thermal efficiency of the frame by up to 15%.

All profiles are manufactured to the environmental standard, BS EN 14001 and are fully recyclable.

Features and benefits

  • Meets Part L (England & Wales) and Part J (Scotland), plus Security Standard BS 7950 and Egress requirements
  • Enhanced thermal efficiency of up to 15%
  • Manufactured to BS EN 14001
  • Fully recyclable
  • Can achieve U values as low as 0.8Wm2K
Fully reversible window


Crystal offers a range of colour options and all of these choices are available in dual colour specification, eg Chartwell Green on outside faces and White on inside faces. All colours shown below are a guide. Before making your final decision please ensure you have seen a foil swatch.


Fully reversible image


Fully reversible image


Fully reversible image


Fully reversible image


Fully reversible image


Crystal direct Windows boast
huge benefits

  • Warranty

    Fully reversible windows come with a 10 year manufacturer's warranty

  • Energy efficiency

    Multi-chambered frames for greater strength and enhanced thermal efficiency

  • Security

    The latest high-performance multi-point locking technology installed as standard

  • Quality

    Manufactured to the highest quality standards, full accredited and CE Marked

  • 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.