Our best-selling triple glazed windows & door range for energy efficient projects
PERFORMANCE is Green Building Store’s cost-effective range for replacement windows/doors, retrofits and low energy newbuild projects. With FSC® certified timber, low U values and a range of designs and styles, our PERFORMANCE range will enhance your project at a competitive price.
- U value as low as 0.85 W/m2K
- FSC® certified timber in redwood & oak
- Alu-clad option for inward-opening windows
- Part Q compliant and Secured by Design options
- Triple glazed as standard