How Timber Windows Help Offset Carbon in New Developments
Timber Windows: The Natural Choice for Lower Embodied Carbon
As developers and architects work toward net-zero targets, embodied carbon is becoming just as critical as operational performance. One of the simplest, high-impact choices you can make is in your window specification.
Timber vs Aluminium or uPVC: The Numbers
The embodied carbon of a typical window frame varies dramatically by material:
- Timber:40–60 kg CO₂e per unit (often carbon-negative when FSC-certified)
- uPVC:90–120 kg CO₂e
- Aluminium:150–250 kg CO₂e
Because wood stores carbon absorbed during tree growth, each cubic metre of timber locks away around 900 kg of CO₂. For a small development using just 1 m³ of joinery timber, that’s equivalent to offsetting a tonne of emissions.
Real Impact for Developers
Switching to timber windows on a 10-home development can cut embodied carbon by 20–30 tonnes CO₂e — roughly the annual emissions of 10–15 average UK residents. For schemes working to BREEAM, LEED, or RIBA 2030 Challenge standards, that’s a meaningful, reportable improvement with minimal design compromise.
Sustainable Craftsmanship from GK Joinery
Our Lignum timber window system, made in Stroud using precision Leitz tooling, combines the beauty of natural timber with modern performance — including vacuum glazing options for ultra-low U-values.
We source only sustainable, traceable timber and run our workshop on solar and biomass energy, further reducing the environmental footprint of every product we make.
Whether you’re designing for conservation areas, contemporary homes, or low-carbon developments, timber windows are an easy, authentic way to build sustainability into every project.
➡️ Discover environmental credentials:
https://www.gkjoinery.com/sustainability/
➡️ Visit our Developer and Architect Trade Portal to learn more about our Lignum range: