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white aluminium flush casement window Flush Casement

Flush Casement Window

Stellar Aluminium casement windows have an immaculate, streamlined flush shape externally, the opening pane is aligned perfectly with the window’s frame. Inside, there’s a neat stepped appearance.

WER up to
band A++

U-Values as
low as 1.0W/m2K

Air permeability
tested to 600Pa

Water tightness
to 600Pa

Wind load resistance
to 2000Pa

Double or
triple glazed

The Flush window for every setting

Immaculate flush lines to the exterior with the neat square profile to the inside delivers an aluminium casement window that works in a wide range of properties. It is simple enough for modern architecture but has proportions and options that make it a great choice for more traditional homes too. There are Astragal bars for those who want detail, an alternative fully-flush sash, and cills designed specifically to match the dimensions of timber frames.

Why Stellar Aluminium?

Stellar is strong. The aluminium window sections can support the weight of large panes of glass without extra reinforcing, allowing individual panes to be larger. Without the complexity of transoms and mullions, views are unrestricted, and more light can flood into your home. Stellar also offers the benefit of equal sightlines for opening and non-opening panes without resorting to adding dummy sashes to the layout.

Casement Window Options

You can choose almost any configuration of fixed and opening panes, any colour and hardware finish, and the result will be a stunning window that looks fabulous and protects your home.

  • Side-hung sash – max 700mm x 1300mm
  • Top-hung sash – max 1200mm x 1200mm
flush aluminium window cross section
  • WER to Band A++ with triple glazing
  • U-value to 1.0W/m2K
  • Meets Building Regs without foams or special polyamides
flush aluminium window cross section
  • Market-leading slim sightlines
  • Astragal bars
  • Thicker cill to replicate timber
  • Needs no dummy sashes
  • Flush sash
flush aluminium window cross section
  • Reverse butt joint
  • Pre-inserted gaskets
  • Takes fast-fit espagnolettes
  • Flat rebates for easy-fit glazing packers
  • Corner ties only on the flush sash
  • No drain prep on cill
flush aluminium window cross section
  • Flat back to frames
  • Flat rebates for easy – fit glazing packers
  • Knock-in beads
flush aluminium window cross section
  • 10-year mechanical performance guarantee
  • 25-year surface paint finish guarantee
  • Lifetime security guarantee on hardware
flush aluminium window cross section

Standard Colours

Signal White
RAL9003 Flat Matt

Anthracite Grey
RAL7016 Flat Matt

Anthracite Grey / Signal White
RAL7016 / RAL9003 Flat Matt

Non-Standard Colours

RAL9001Flat Matt

Agate Grey
RAL7038Flat Matt

Slate Grey
RAL7015Flat Matt

Chocolate Brown
RAL8017Flat Matt

Anthracite Grey

Jet Black
RAL9005Flat Matt


Stellar’s quality demands an equally high-quality range of hardware.

aluminium casement window handle in white

Casement Window

Tilt & Turn Window

aluminium door handle

Flush Door

lift and slide door handle

Lift & Slide Door

Bifold Door

Colours and Finishes

Handle finishes have been selected for scratch resistance and durability as well as their ability to complement the finish of frames.

silver handle

Satin Silver

chrome handle

Polished Chrome

white handle


black handle