The ultra slim 59mm sightlines* of the innovative Classic window system maximises the light flooding into your home, creating a refined architectural look. We’ve also designed out the misalignment of corners seen on lesser aluminium systems, using our patented construction method. Allowing each Classic window to be individually hand tuned to perfection. Leaving you with the perfect balance of understated refinement and exacting quality standards.

Featuring Our Unique Thermlock^®  Technology

Clean, 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. These 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.

Inbuilt Security

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.

Create Light, Airy Interiors

Our ultra slim aluminium windows are available in casement, French and fixed styles, with sightlines as slim as 36.5mm for picture windows, and 59mm for opening windows*. Classic lets light flood in, opening up interiors helping to create that important sense of space and tranquillity.

*Beadless sashes, 60.5mm for beaded sashes