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uPVC Sliding Sash Windows

Vertical Sliding Sash Windows

If you are looking to maintain the appearance of your home or introduce a period feel into our modern home, then our uPVC sash windows offer the perfect solution. Our vertical sliding windows give you classic style, authentic finishing and modern efficiency. With many houses in Britain still retaining their original wooden sliding box sash windows, and homeowners wanting to conserve the traditional appearance of their properties, our vertical sliding windows can help you take advantage of this profitable market opportunity.

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Aluminium Windows Prices

Our Spectus sliding sash windows have been designed to match the traditional look of a timber box sash window, whilst eliminating all the problems associated with wood such as rotting, warping and twisting.

Authentic Looks. Modern Benefits

Spectus Window Systems
uPVC Sash Windows

The Spectus sliding sash window will look fantastic in any setting thanks to a wide range of colours, finishes and glazing. Matching window to property has never been easier.

A Great Match For Heritage & Modern Properties

Spectus Window Systems

Spectus uPVC Vertical Sliding Sash Windows

upvc sliding sash windows

Not only do our sliding sash windows look great but they are also hugely practical. They combine a tilt facility and lift facility for excellent functionality and easy cleaning from the inside.

Tilt Open Facility For Easy Cleaning

Spectus Window Systems

Spectus uPVC Vertical Sliding Sash Windows

Sliding Sash Windows

They are also available with a range of optional extras allowing you to achieve a custom look for any property.

Hardware Options

Spectus Window Systems
Vertical Sliding Sash Windows

Our uPVC vertical sliding sash windows are built to slide vertically downwards and upwards. Traditional pulleys have been replaced with spiral balances and an advanced tilting mechanism to provide effective ventilation and ease of cleaning.

Vertical Sliding Mechanism

Spectus Window Systems
upvc sliding sash windows

Designed with a decorative sash horn for greater authenticity, our uPVC sliding sash windows will perfectly complement period style properties. We also offer astragal Georgian bars to further enhance your traditional look.

Decorative Sash Horn

Spectus Window Systems

Spectus uPVC Vertical Sliding Sash Windows

Sliding Sash Windows

A wide choice of coloured and foiled finishes, as well as being available in any RAL colour. We also provide Period window hardware in a choice of classic finishes.

Authentic Colours & Period Hardware

Spectus Window Systems
energy efficient double glazing

Thermally efficient (A rating) and highly secure, our precision engineered vertical sliding windows have been designed to deliver excellent performances and a smooth, effortless operation.

Energy Efficient

BFRC logo

Our uPVC sliding sash windows have been Kitemarked to BS EN 12608 and certified to PAS 24, as well as being approved by the British Board of Agrément. They conform to BS EN ISO 9001 and are recognised for responsible sourcing under BES 6001.

Accredited Design

high security sash windows

Spectus Vertical Sliding Sash Windows

  • Compatible with ‘off the shelf’ hardware
  • Customisble design
  • Wide choice of colours and woodgrain finishes
  • Available with trickle or glazed in vents
  • 128mm outerframe to match traditional timber sash dimensions
  • Maxmimum size of 1600mm wide and 3000mm high
  • All sash profiles are designed with equal sightlines to the top and bottom sashes
  • 150mm and 210mm cills
  • 10mm, 20mm, 50mm frame packers


  • Classic ovolo style to the frame, bead, sash and cill
  • Optional Georgian bars, sash horns, weather bars and deep bottom rail – all designed to provide the perfect period look
  • Flush gaskets which mimic traditional glazing
  • Approved by many planning boards for use in conservation areas



  • Can achieve A Energy Rating with 24mm sealed units
  • Pile seals to sash and outerframe to prevent draughts


Colour Options

Available in a choice of wood grain foils in traditional colours, our vertical sliding windows perfectly complement both heritage and modern buildings. They can also be specified in dual colour, with a different finish inside and outside. Choose from White, Cream, Irish Oak, Light Oak and Rosewood laminated foils. The authentic look of our windows is further enhanced by features such as the deep bottom sash rail, Georgian bars and decorative horns, as well as period hardware in a choice of finishes.

Golden Oak
Black Brown
Anthracite Grey
Irish Oak
Chartwell Green

Sash Window Prices

Contact us today for a free sash window quote. Sternfenster offer unbeatable sash window prices for both retail and trade, get in touch to find out more.

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