Sternfenster launches ‘Timberline’ – a timber-authentic PVC-U Flush Window

Sternfenster has expanded its premium PVC-U portfolio with the launch of Timberline, a next-generation flush sash system designed to deliver the warmth and authenticity of timber with the efficiency, practicality and consistency of modern manufacturing.

Developed to meet growing demand for high-end heritage and contemporary installations alike, Timberline replicates the refined proportions and subtle detailing of a traditional timber flush sash, but with a number of engineering innovations that set it apart in the market.

The most significant is its unique square-welded internal and external joints. While other manufacturers rely on a 45-degree internal mitre, Timberline achieves a clean, perfectly squared finish on both sides of the sash and frame. This not only enhances authenticity but creates a sharper, more architectural aesthetic that homeowners and designers increasingly favour.

“Timberline is a leap forward in timber-alternative design,” said Nathan Court, Sternfenster’s Chief Sales Officer. “Installers told us they wanted a flush sash that truly stood out – something with the craftsmanship and visual depth of timber but the efficiency and reliability of PVC-U. 

“Timberline delivers exactly that, and the square weld is a genuine USP that sets a new benchmark for the category.”

Available in an extensive palette of foiled finishes – including heritage woodgrains, contemporary matt textures and dual-colour options – Timberline can be specified with a wide range of hardware choices to suit traditional or modern properties. 

Performance has been engineered to match its aesthetics. Timberline achieves outstanding thermal efficiency, with U-values as low as 1.2 W/m²K, and has been designed to meet the latest security requirements, including PAS 24 options. 

Combined with Sternfenster’s advanced manufacturing capability, installers benefit from reliability, consistency and seamless integration with the company’s digital tools such as EasyAdmin+ and EasySales.

“Timberline gives our customers a product that is both beautiful and technically robust,” added Nathan. “It expands their ability to win work in the premium and heritage sectors while offering homeowners a window that combines authentic design with modern-day performance.”

For more information visit www.sternfenster.com  email sales@sternfenster.co.uk or call 01522 512525. Alternatively, join the conversation on LinkedIn.