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Fully Flush Casement Window

The fully-flush casement extends the streamlined flush shape to both the interior and exterior of the window. It’s the ultimate in minimalist styling and ideal for the most modern styles of architecture.

WER up to
band A++

U-Values as
low as 0.9W/m2K

Air permeability
tested to 600Pa

Water tightness
tested to 600Pa

Wind load resistance
to 2000Pa

Double or
triple glazed

Combining ultra-slim sections with simple shapes, Stellar’s fully flush casements are versatile. The frame simply isn’t allowed to dominate the view and the clean simple shape allows other architectural elements in your home to shine.


Flush inside and out, this is a high-performing window with graceful looks that hide remarkable strength. You’ll enjoy more comfort with Stellar’s insulation, more reassurance with its secure design, and more time to yourself because these windows are virtually maintenance free.


Every fully-flush casement window is a bespoke product. Made to your exact specification, with your choice of layout, glass, finish and hardware.

  • Side-hung sash – max 700mm x 1300mm
  • Top-hung sash – max 1200mm x 1200mm
  • WER up to Band A++ with triple glazing
  • U-value as low as 0.9W/m2K
  • Meets Building Regs without foams or special polyamides
  • 40mm and 45mm polyamide thermal breaks to compensate for larger sightline.
  • True flush sash indoors and out (no stepped frame)
  • Astragal bars
  • Market-leading slim sightliness
  • Thicker cill to replicate timber
  • Needs no dummy sashes.
  • Reverse butt joint
  • Pre-inserted gaskets
  • Takes fast-fit espagnolettes
  • No corner ties
  • No drain preparation on cill.
  • Flat backed frames
  • Flat rebates for easy-fit glazing packers
  • Up to 44mm triple glazing
  • Same bead as fixed light
  • Knock-in beads.
  • 10-year mechanical performance guarantee
  • 25-year surface paint finish guarantee
  • Lifetime security guarantee on hardware

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