Classic Windows

Slim ultra-secure aluminium windows in a choice of 12 colours
Introducing the Classic

Transform your home with our high performance aluminium windows.

Designed to combine the latest technical innovations with peerless aesthetics

Choosing the right windows for your home is an important decision. An investment that makes a real difference to how warm and secure you feel; as well as changing the look of your property. This is why we have designed the Classic system from the ground up. Building on years of experience, we’ve incorporated many new innovative ideas; creating a warmer, slimmer and more secure window system. Designed for discerning homeowners who aren’t willing to compromise, our windows are tailored to those who demand more for their home. Built around an innovative Thermlock® multi-chamber thermal break, our windows use a patented construction method that offers unsurpassed levels of security. Creating windows that are strong and durable, yet with slim frames that maximise the light flooding into your home. Sheerline aluminium windows are also available in a wide range of colours, letting you express your home’s character

Made in Britain
Benefits for your home
Exceptional Security

The innovative construction method of the Classic system creates exceptionally strong frames, maximising the inherent strength of Sheerline’s aluminium windows. This coupled with our high security multipoint locking, helps keep you and your home safe and secure. Additional features like unique hinge protectors also help create outstanding levels of security. For ultimate security, a beadless option is also available in the Classic window system which eliminates the need for separate glazing beads. Instead, our patented† corner jointing method securely locks the glass away within a completely sealed unit. No window in its class is as secure.
All Sheerline windows carry PAS24:2016 enhanced security accreditation, so if you are looking for stylish aluminium windows with extra peace of mind as standard – then we have you covered.
For added peace of mind choose our laminate glass upgrade – for Secured by Design accreditation – the official UK Police initiative ‘designing out crime’ through physical security.


Cold, crisp lines on the outside hide away our innovative Thermlock® multi-chamber thermal design, helping keep you and your property well insulated against the worst of the UK weather. Their insulating chambers act as a thermal break and work in conjunction with high performance glazing to create class leading thermal performance, far superior to traditional polyamide thermal breaks. Sheerline’s cills also feature this same technology coupled with innovative in-built weather sealing that keep draughts and rain safely outside.

1.5 U-value W/(m²K) Double glazed

Thermal transmittance, also known as a U-value, measures the rate of transfer of heat. The better-insulated a window is, the lower the U-value will be.

Patented Construction

The ultra slim 59mm sightlines* of the innovative Classic window system maximises the light flooding into your home, creating a refined architectural look. While our patented construction method uses threaded screws to bind corners tightly together in perfect unison. We’ve also designed out the stepping of misaligned corners, allowing each Sheerline window to be individually hand tuned to perfection. Leaving you with the perfect balance of understated refinement and exacting quality standards.

Made in Britain
A range of contemporary colours

Classic windows are available in eight powder coated matt colours, as well as a high gloss white with the option of choosing a different colour for the interior to help you find the look that is perfect for your property. A further three metallic effect colours are available for the ultimate durable and stylish finish.

“Please note; due to the nature of the manufacturing process and the differences in the methods used to represent these colours on screen we cannot guarantee an exact colour match with the colours shown. The RAL colour references are also provided as a guide only.’‘


Flush Stepped

Flush Contemporary


Styling Options

With a choice of traditional or contemporary styling Sheerline aluminium windows are available in a choice of two opening sash styles; ‘Stepped’ – inspired by traditional steel windows and ‘Contemporary’ - with a more modern minimalist aesthetic.


Both styles are available in either our standard outer frame, or as a ‘Flush’ option that brings both the perimeter and the opening sash perfectly in-line with each other. You can draw on our experience if required to find the one that resonates best with your home’s character. A range of Georgian bar options are also available.

Classic Windows Brochure

Sheerline Classic Windows Consumer Brochure

Classic Installation Guide

Your guide to installing Sheerline Classic Windows

Beaded Classic Installation Guide

Your guide to installing Sheerline Beaded Classic Windows

Get in touch
Find Out More

Please contact us for more information about the Classic window range or any other Sheerline product, and to be put in touch with your closest Sheerline installer.

Contact us