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Lignum Windows

High‑performance timber windows, fully certified

Derwen Joinery supplies Lignum timber windows for homes that demand modern performance without losing the character of real wood. Manufactured in the UK using the Lignum window system, each window is precision made, fully tested and designed to suit new builds, replacements and traditionally styled properties.
Lignum windows are engineered to meet the latest building regulations, including PAS 24 security, Part Q and Secured by Design. This allows security and compliance to be built in without altering the appearance of the window.
Every Lignum window is made to measure using engineered, sustainably sourced timber and finished in durable factory‑applied coatings. High‑performance glazing and modern locking systems ensure excellent thermal efficiency, long‑term reliability and a solid, reassuring feel in everyday use.
The result is a timber window that looks right, performs consistently and is built to last.

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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.

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Smarter design, Greener living, Warmer homes

With energy prices continuing to rise, efficiency has never been more important. Our windows can be specified with high‑performance glazing and naturally insulating timber frames to help retain warmth and improve overall energy performance.

Better than triple glazing: we offer advanced vacuum glazing technology that is thinner, warmer and quieter than traditional triple‑glazed units. This makes it an excellent choice for both retrofit projects and low‑energy new builds, delivering outstanding thermal performance without increasing the thickness of the window frame.

Secure design, Safer homes, Lasting confidence

Our windows are designed with both beauty and security in mind. All components can be specified to meet PAS24 standards, giving you complete peace of mind without compromising on timeless design. High‑specification locking systems are discreetly integrated into the frame, ensuring your security requirements and regulatory standards are fully met.

Whether you’re refurbishing a Georgian townhouse or completing a modern eco‑home, you never have to choose between form and function. Our windows deliver both.

Frequently Asked Questions (FAQ)

What is the Lignum timber window system?

 

Lignum is a fully engineered timber window system developed by The Joinery Network and manufactured by approved UK joinery specialists. It combines precision engineering, tested profiles and modern glazing standards with traditional timber craftsmanship, delivering consistent performance across new build, replacement and heritage projects.

 

How are Lignum windows tested for security and compliance?

 

Lignum windows are independently tested as complete window systems to meet current UK security and performance standards, including PAS 24 and Secured by Design where specified. Frames, glazing, ironmongery and fixings are assessed together to ensure the installed window performs exactly as tested and complies with Building Regulations Part Q.

 

Are Lignum windows suitable for new build applications?

 

Yes. Lignum windows are designed to meet the requirements of modern building regulations, including Part Q for security and Part L for thermal performance. This makes them suitable for new build housing, change‑of‑use developments and extensions, while retaining proportions appropriate for traditionally styled architecture.

 

Can Lignum windows be specified for heritage and conservation projects?

 

Lignum windows can be manufactured using heritage‑appropriate profiles, including flush casements and sash designs, with slim sightlines and traditional detailing. Specialist glazing options allow improved thermal and acoustic performance while maintaining appearances suitable for conservation areas and period properties, subject to local planning approval.

 

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