STRETTA Mechanically Jointed Flush Casement Windows

STRETTA Flush Casement Windows


STRETTA is a range of Mechanically Jointed uPVC windows featuring flush sashes, manufactured by Buildcon. STRETTA Suits contemporary properties and traditional homes. Each window is hand-crafted by our Joiners using high impact, durable uPVC. Because they so accurately replicated timber flush windows, they could be the ideal solution for sensitive period buildings and for properties in conservation areas.

Flush Casement Windows are ideally suited to modern-day living, with a sleek, contemporary appearance and almost zero maintenance. Each of the colour finishes is available with a woodgrain effect which adds depth and character, with the exception of Spectral which has a matt smooth finish.

Buildcon’s Flush Casement Windows feature a visible mullion, a vertical structural bar often seen between window sashes. With a French window, with two opening sashes side-by-side, we can now manufacture a stylish window incorporating an invisible mullion. From outside, the windows have a sleek finish, allowing 20% more light into your home and when the windows are fully open, you benefit from an unobstructed view.

You can be confident that whatever style you choose, your windows will provide warmth and security and will enhance your home for many years to come.

Key Features of STRETTA Flush Casement Windows

  • Mechanically jointed sash and frame to replicate timber
  • Lockable night vent facility
  • Sculptured Ovolo finish to the inside
  • 5 colours from stock
  • NEW Spectral matt finish in Anthracite Grey
  • Suitable for conservation areas
  • 3 elegant handle designs in various finishes
  • Excellent thermal performance - U-Value of 1.2 W/m2K
  • 10 year guarantee


  • Concealed Mullion - Invisimull
  • Georgian bars available to replicate timber windows
  • Windows can be top hung, side hung or fixed
  • French Windows
  • French Doors
  • Bay assembly
  • Many types of glazing
  • Easy clean fire escape hinges
  • Over-scribed beads available

General Description
Buildcon's Halo PVCu Flush Casement Windows are hand-finished with scribed and milled butt joints to closely replicate traditional timber windows.
Frame depth 70mm front to back.

A dummy sash is fitted to any fixed window, which gives the impression of an opening sash and provides a balanced appearance, with equal sight lines.

Astragal bars available
in traditional Georgian layouts or twin horizontals.

Welded corner joints will withstand up to 1.7 Kn of pressure.

Mechanically joined or Welded sash.
Over-scribed beads available.
Optional reinforced cill, please ensure this is requested when placing your order.
Sash Parameters
Top Hung Reinforced Max Width 1376 - Max Height 1376
Side Hung Reinforced Max Width 776 - Max Height 1526
Fixed Reinforced Max Width 3000 - Max Height 3000
Comprehensive range of configurations of fixed and opening sashes. Dummy sash to fixed windows creating a balanced appearance and equal sight lines.

Glass specification
28mm double glazing
Push-button locking in White, Chrome, Gold, Black, Antique Black or Graphite.

Antique Monkey Tail handle or Tear Drop handle in:
Chrome, Antique Black, Graphite or Gold

Fire escape hinge fitted to all side opening windows, as standard
U-Value 1.2 W/m2K
Multi-point locking, securing all 4 sides of the opening sash.
Fire escape/easy clean hinges fitted to all side openers.
Shootbolt locking.
Lockable night vent facility.
Security claw for additional security.

Wide range of colours including White, Light Cream, French Grey, Agate Grey or Anthracite Grey.

Spectral matt finish in Anthracite Grey outside and Smooth White finish inside.

Sculptured ovolo mould inside.

10 year warranty



Each STRETTA Flush Casement Window is hand-finished with scribed and milled butt joints to closely replicate traditional timber windows. The mechanical joints and slim appearance offer a truly authentic look and from a short distance away it is difficult to distinguish from timber windows, providing the ideal solution to replace existing timber windows in conservation areas.

Available in a huge range of finishes, including as standard: Anthracite Grey, Cream, Agate Grey, White and Pebble Grey, and introducing the Spectral Grey external finish which authentically replicates a smooth aluminium finish.




Material Information


uPVC is a versatile material being both light weight and easy to handle, coupled with having good mechanical strength. uPVC is resistant to weathering and corrosion, meaning it requires very little maintenance, which makes it ideal for windows and doors in your home.

uPVC’s long lifespan, low maintenance, and potential for high-quality reuse make it one of the most sustainable products currently available in the building and home improvement market.







When making a decision about your windows, it is worth spending some time considering the style and colour of the handles. As standard, we fit a push button locking handle, which operates the multi-point locking system. These are available in a choice of White, Chrome, Gold, Black, Antique Black or Graphite.

You can choose an Antique Monkey Tail handle or a Tear Drop handle in Chrome, Antique Black, Graphite or Gold.





Safety & Security


Every window is secured by a multi-point locking system, securing points on all four sides of the opening sash, for your safety and security. We fit fire escape hinges on all side opening windows, as standard.



Safety & Security

Colour Options


Our Flush Casement Windows are available in a luxury Spectral Grey finish which authentically replicates a smooth aluminium finish.

If you prefer a woodgrain effect which replicates timber, choose from 5 contemporary colours externally:



Agate Grey

French (Pebble) Grey

Anthracite Grey

Or a Smooth White finish








We pride ourselves in having some of the best products in the Bhopal. Learn more about the supplier of this product on our suppliers page.

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Questions? us today!

If you wish to find your Buildcon design partner, have any questions or would like to discuss our premium range of products then please contact us.