Timber Windows

Bespoke timber windows for every style

We manufacture an extensive range of bespoke timber windows, including traditional sash and casement designs. Each window is crafted with exceptional care, using high‑quality timbers and meticulous workmanship to achieve a refined, seamless finish that enhances any property.

While rooted in classic joinery traditions, our windows also deliver the advantages expected from modern performance glazing. Every design incorporates advanced security features and meets the latest building regulations for energy efficiency, durability and overall performance.

Have a Project in Mind? Let’s Talk.

At Derwen Joinery, we believe every exceptional piece begins not with timber, but with a conversation. We are genuinely interested in your ideas, your questions, and the unique details that will make your project a perfect fit for your space. Understanding your vision is the most crucial part of our craft. Get in touch with us today to discuss your plans and let’s begin the journey of bringing them to life.

Casement Windows

Windows that Deliver Style and Performance

Timber casement windows remain one of the UK’s most popular choices, and at Derwen Joinery we offer three carefully designed options to suit a wide range of properties and project requirements.

Traditional Flush Casement An ideal solution for period homes and traditional renovations, offering authentic character and a beautifully understated appearance.
PAS24 High‑Performance Casement A modern, energy‑efficient design engineered for new builds and change‑of‑use developments, delivering enhanced security and compliance with current regulations.
Conservation Casement Crafted to replicate or complement existing windows, making them perfectly suited to properties within conservation areas or those listed as Grade I or Grade II.

explore our casement windows

Sliding Sash Windows

Windows Built for Charm and Functionality

Sash windows bring a timeless elegance and a sense of heritage to any property, from period country homes to contemporary townhouses. Featuring two vertically sliding glazed frames, or ‘sashes,’ set within a traditional outer frame, they are admired for their distinctive proportions and classic architectural appeal.

Our sash window range combines authentic detailing with modern performance. Each design offers the perfect balance of traditional character, smooth functionality and excellent energy efficiency, making it an ideal choice for both sensitive restoration work and high‑quality new build projects.

explore our sliding sash windows