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About Our Vertical Sliding Windows

Whether replacing existing timber sliding sash in period buildings or adding character to any new development, they come complete with an easy clean facility for practicality as well as performance and aesthetics.

With frames from the market-leading Spectus, there is no doubt that a quality product is within grasp. Along with smooth functionality and incredible energy efficiency, our vertical sliding windows provide an enormous range of benefits.


Formed in 1982, Central Window Systems is currently one of the Midlands’ largest fabricators of PVCu and aluminium products.

Our vast range includes Deceuninck PVCu windows and doors, as well as aluminium windows and roof light systems from AluK.

We pride ourselves on delivering quality products matched with reliable service and outstanding customer care, and with a wealth of experience and knowledge, we’re a stable company that will support you continually.

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vertical sliding window costs
  • Specification
  • Product Options
  • Performance
  • QR Code System


  • Manufactured from fully featured suite in white and foil finishes
  • Internally glazed, multi-chambered
  • Central catch with additional corner sash locking
  • High performance weatherpile sealing
  • Aluminium reinforcement
  • 24mm Low-line glazing bead
  • Tilt restrictor and easy clean facility
vertical sliding window specification

Product Options

  • Options of increasing locking points for enhanced security
  • Concealed perimeter locking System
  • Gold, chrome locking handles
vertical sliding window


Energy Efficiency

  • Window Energy Rating available to A+ with 24mm sealed units
  • Low U Value achievable
  • Prevent draughts with seals on outer frame and sash
vertical sliding window costs

QR Code System

Our new QR code system offers a fast and easy way to find information about all of our PVCu windows and doors. It’s easy to use, and it lets our central installers find technical specifications and guides all on their smartphone!

  • Useful “How-To” Videos
  • BFRC Energy Rating Information
  • Product Simulations
  • Hardware & Glass Size Specifications

Become an installer, and find out more about our QR code system.

Colour Range

Making sash windows accessible

Timber sash windows have been an integral part of architecture across England and the UK more widely for hundreds of years.

However, as aesthetically pleasing as it is, wood is a hard material to keep looking its best – and timber windows require extensive and often costly maintenance.

That’s what makes twenty-first century alternatives like the Spectus vertical slider so popular. They’re able to offer the sought-after vintage aesthetics of a traditional window, but the low maintenance and easy cleaning of PVCu. A tilt option for both sashes makes keeping them spotless a breeze.

What’s more, thanks to their state-of-the-art double glazing, they deliver twenty-first century performance too – achieving U-Values as low as 1.3, and Window Energy Ratings of up to A+, making them highly energy efficient windows that can help reduce draughts and lower bills.

For installers looking to sell the benefits of greater energy efficiency, they’re an excellent choice.

vertical sliding window costs
sliding windows prices

Versatility that homeowners love

Spectus vertical sliders are also hugely versatile. They can come in a wide array of heritage features designed to make them indistinguishable from a timber sash window, such as sash horns and deep bottom rails.

However, while period properties in a conservation area might be your first thought when you hear the term ‘sash window’, they’re equally suited for more modern buildings too.

Spectus vertical sliders are available in an extensive range of colours, including popular contemporary choices like anthracite grey.

Why Choose Central Window Systems?

Experience Matters

With a wealth of experience and knowledge, we are a stable company who will be here to support you in the years to come.

Highest Quality

Exceptional product quality is a prerequisite at Central Window Systems. We offer the most advanced window and doors available on the market.

Professional Standards

Delivering products to you on-time, in full and in pristine condition ensuring your professional installation is completed with the support you expect from your supplier.

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For the busy glazing installer, our marketing support service is completely accessible via your Smart Phone. As a Central Window Systems partner, you get instant access to our full suite of technical information and promotional material.

  • Showroom Materials & support
  • Brochures, Downloads & Images
  • Latest News & Notification System
  • Plus much more
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