Frame material options

Are you still weighing up whether to use wood or PVC-U? Is so, click here.

If, like us, you feel wood is the best choice all round, you still need to consider some options, depending on the exposure the windows and doors will be subject to.

All wood used by our members is certified as legally sourced from sustainably-managed forests and is the most environmentally-friendly window frame material you can buy. Our members' wood windows are durable (with an estimated service life of 56-65 years) and have long maintenance intervals (typically, an initial 8-10 years, followed by a 7-year cycle).

For windows in exposed conditions, or where maintenance access is difficult, such as coastal areas or high-rise buildings, some members offer 'Wood-Plus' alternatives, such as modified wood (e.g. acetylated, such as Accoya™) or aluminium-clad wood. These premium solutions offer extended service life expectations of up to 80 years or more and longer maintenance intervals of 10 to 30 years.

All windows within the Wood Window Alliance scheme get the best available ratings in their class in BRE's Green Guide to Specification:

  • All WWA-standard timber windows are rated A+
  • WWA-standard aluminium-clad windows with a translucent coating on the wood frame are rated A+
  • WWA-standard aluminium-clad windows with a solid colour coating on the wood frame are rated A

Typical maintenance intervals - Moderate climate

Moderate: typically non-coastal areas at low altitude

Sheltered

e.g. beneath porch or large roof overhang

  • 8 years for timber
  • 12 for modified timber
  • 30 for Alu-clad timber

  • Partly sheltered

    e.g. window built back in reveal.

  • 8 years for timber
  • 12 for modified timber
  • 30 for Alu-clad timber

  • Not sheltered

    e.g. face of building

  • 7 years for timber
  • 10 for modified timber
  • 30 for Alu-clad timber

  • Typical maintenance intervals - Harsh climate

    Harsh: exposed inland locations and areas within 0.5 miles of the coast

    Sheltered

    e.g. beneath porch or large roof overhang

  • 7 years for timber
  • 9 for modified timber
  • 30 for Alu-clad timber

  • Partly sheltered

    e.g. window built back in reveal.

  • 6 years for timber
  • 9 for modified timber
  • 30 for Alu-clad timber

  • Not sheltered

    e.g. face of building

  • 5 years for timber
  • 7 for modified timber
  • 20 for Alu-clad timber

  • Typical maintenance intervals - Extreme climate

    Extreme: areas of high altitude and exposed coastal sites

    Sheltered

    e.g. beneath porch or large roof overhang

  • 7 years for timber
  • 9 for modified timber
  • 30 for Alu-clad timber

  • Partly sheltered

    e.g. window built back in reveal.

  • 5 years for timber
  • 7 for modified timber
  • 20 for Alu-clad timber

  • Not sheltered

    e.g. face of building

  • 4 years for timber
  • 6 for modified timber
  • 20 for Alu-clad timber