ULTRA triple glazed casement outward opening timber windows Green Building Store


Green Building Store ULTRA triple glazed timber window outward opening casement with Passivhaus certified option

Triple glazed timber outward opening casement windows, with Passivhaus-certified insulated frame option. Uw  0.75 – 0.68 W/m2K


  • Outward opening (inward opening also available)
  • High performance triple glazing
  • Passivhaus certified insulated frame option
  • FSC® redwood or oak timber
  • Secured by Design option
  • 98mm profile
  • BRE Green Guide A+
  • Made exclusively for Green Building Store by our partners in northern Europe

Glazing & U values

Solid frame:
Whole window U value: Uw 0.75 W/m2K (Redwood)
Whole window U value Uw 0.83 W/m2K (Oak)

Insulated frame:
Whole window Uw 0.68 W/m2K (Redwood – Passivhaus certified)
Whole window Uw 0.72 W/m2K (Oak)

Glazing U value: Ug 0.52 W/m2K
Triple unit: Argon fill 52 mm
Light transmission value: 74.1%

Typical maximum sizes

Fixed light: 2500 mm x 2500 mm
Side hung: 950 mm x 1520 mm
Top hung: 1300 mm x 1650 mm

Please see some sample styles below. If you can’t see the style you’re looking for, please get in touch, as everything we do is bespoke and made to your requirements.

Please get in touch if you require a specification clause for this product:

Affiliations & Accreditations