We set out knowing we wanted to solve the issues aluminium customers faced


The first of our innovative window and door systems. Ultra secure, ultra slim beadless aluminium windows, built without compromise

We aim to transform the experience of buying aluminium systems and windows from start to finish. Our technical experts looked at every aspect of aluminium windows and doors, from how they’re made and installed, how they perform and look, to the service and support you need and get. And we’ve redesigned everything so they’re easy to fabricate, order, install, and sell.

Aluminium press


We’ve invested over £9m in a state-of-the-art factory to produce innovative residential aluminium window and door systems. The investment ensures quality is built into our foundations.

David Lennox and Phil Parry consult over the latest plans


Roger Hartshorn and the team have an unrivalled record of success in windows and doors. We assembled the best technical brains and the best industry experience to develop and supply the most advanced aluminium products.

Tablet showing our Integrated systems


From aluminium logs to On-Time-In-Full supply in industry leading responsive time, we’ve integrated our manufacturing and logistics for seamless efficiency, high quality, and outstanding service.  

Designed by a team with a proven track record

The industry’s leading experts have contributed a wealth of technical and operational expertise to Sheerline

The Sheerline system by Garnalex is a new venture from Roger Hartshorn, who has more than 40 years experience and successfully founded and sold two profile systems companies (Eurocell plc and Liniar). He has now turned his attention to aluminium and attracted a high-powered team of technical experts with decades of experience between them at companies such as HL Plastics, Synseal, Eurocell and Epwin. Together they are on a mission to re-invent aluminium windows and doors.

Proudly designed and manufactured in the heart of the UK

We are on a mission to transform what customers expect from aluminium windows and doors. From design and testing, to the manufacture of every major component at our state-of-the-art facilities, we are passionate about each element that goes into producing the Sheerline window system. Delivering windows that operate, perform and look exceptional, keeping you warm and secure for many years to come.

Made in Britain

We've set out to create a simply better window

Our new aluminium windows and doors solve current issues, while adding value and advantages you’ve never dreamt of

While PVC-U and timber windows and doors have been transformed over the past 30 years, there’s been little investment or development in residential aluminium windows and doors. Analysing current problems and opportunities, we’ve built plenty of innovation into Sheerline to create a product with improved energy efficiency, easier and faster fabrication, and stunning looks for installers and homeowners.