Classic flush casement or fully flush casement

A classic flush casement

With flush lines to the exterior and a neat square shape indoors, our casement windows are simple, elegant and understated. The frames are slim, allowing more light into a home than comparable sized PVC-U or timber frames, but built from robust aluminium sections, they’re strong enough to support large panes without the need for reinforcing. The result is pure class.

Opening panes can be top or side hung, and you can choose almost any configuration. If symmetry is important, dummy sashes allow us to create equal sightlines for opening and non-opening panes. These windows are designed to work perfectly with high-security hardware, lock systems and hinges for your complete peace of mind. Choose the colours that best suit a property, handles in contrasting or matching colours and every detail will be made to your exact specification.

A fully-flush casement

The sleek fully-flush casement window offers the most streamlined look on the market with flush styling for both the interior and exterior. No angles, no overlaps, just pure clean shapes and ultra-thin frames that set our windows apart.
Hardware has been carefully selected. In addition to reliability and durability, every lock, stay, hinge and handle contributes to the high level of security. What’s more, all these practical qualities are delivered without compromising the remarkable lines.
Again, the configuration is up to you. Replicate the pattern of opening and fixed panes in your existing frames and enjoy improved light levels, better insulation and easier maintenance or throw caution to the wind and choose a radical pared-back style.

Fixed frame windows

Not every window needs to open, and there’s something very special about a window with a purpose that’s purely aesthetic. With our windows the frame doesn’t dominate. There’s more view, more light and more interest.

Features and benefits

  • WER up to Band A+ with triple glazing
  • U-values as low as 1.1W/m2K
  • Market leading slim sightlines
  • Astragal bars
  • Thicker cill to replicate timber
  • Needs no dummy sashes
  • Flush sash
  • 10 year mechanical performance guarantee
  • 25 year surface paint finish guarantee
  • Lifetime security guarantee on hardware


All aluminium sections are finished with a tough, durable polyester powder coat, certified to the Qualicoat standard, which surpasses European requirements. The finishes need next to no maintenance – just a quick wipe down to remove surface dirt. For more challenging environments, we can also supply special marine-grade finishes.  There’s a wide choice of stocked colours chosen to enhance all types of building materials and if you want to choose something different, it’s possible to have your windows or doors finished in any RAL colour.







Crystal Direct windows boast
huge benefits

  • Warranty

    Windows come with a 10 year manufacturer's warranty

  • Energy efficiency

    Marketing leading thermal performance

  • Security

    Lifetime security guarantee on hardware

  • Quality

    Manufactured to the highest quality standards, fully accredited UKCA Marked

  • Recycling

    End of life 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.