Classic Windows

With unrivalled security built into the heart of every window. The innovative construction of the Classic window system eliminates the need for separate glazing beads – often an area of weakness in traditional window design. Instead our patented corner jointing method securely locks the glass away within a completely sealed unit. This coupled with our high security multipoint locking and unique hinge protectors creates unparalleled levels of security. 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 security choose our laminate glass upgrade – for Secured by Design accreditation – the official UK Police initiative ‘designing out crime’ through physical security.

Thermlock® technology helps keep you and your home snug and warm. 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.

This closed-cell, insulating chamber acts as a thermal break and works in conjunction with our high performance double 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.

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.

With great looks from every angle - due to our unique construction method. 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 – using threaded screws to bind corners tightly together in perfect unison – creates perfect run through mitres on internal joints, doing away with the unsightly junctions of square cut beads seen on ordinary aluminium windows.

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.