PERFORMANCE

U values as low
as 0.85 W/m²K

Triple glazed
as standard

Nationwide fitting
or supply only

Choose from a wide
range of colours

FSC^® certified timber

Part Q compliant and
Secured by Design options

Our best-selling triple glazed windows & door range for energy efficient projects.

 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 GBS-78 formerly named Performance range will enhance your project at a competitive price.

• U value as low as 0.85 W/m²K
• Dual compression seals
• 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