Sheerline Classic Windows offer an ideal fusion of traditional aesthetics and cutting-edge technology. These slimline aluminium windows feature sightlines as narrow as 59mm, allowing more natural light into your home while maintaining a sleek, stylish appearance. Read more about this product below or contact us for quotes.
Sheerline Classic Windows blend cutting-edge technology with elegant, timeless design. At Castle Windows, we’re proud to offer this premium aluminium window range to homeowners across Newbury, Reading, and Berkshire. Featuring ultra-slim frames, exceptional thermal performance, and robust security, Sheerline Classic Windows are the ideal choice for those seeking style, efficiency, and durability.

Slim Sightlines
Security Standards
Durable Aluminium Construction

These windows are engineered to meet and exceed current thermal efficiency standards, offering Part L compliance as standard. This makes them an excellent choice for energy-conscious homeowners.
Whether you prefer a modern look or a steel-inspired design with a stepped sash and glazing bars, these windows offer versatile aesthetic options to suit any project.
These windows are available in a selection of eight powder-coated matt colours, a high gloss white, and three anodised finishes, with the option for dual-colour configurations to match both the interior and exterior decor.

Experience Sheerline Classic Windows
Sheerline Classic Windows excel in energy efficiency, exceeding Part L regulations for thermal insulation. This translates to lower energy bills and a more comfortable home by effectively retaining heat during colder months.
Security is paramount, with these windows meeting PAS24 security standards and achieving Secured by Design accreditation. This ensures robust protection against break-ins, providing homeowners with peace of mind through advanced locking systems and strong construction.