PROGRESSION Passivhaus-certified windows - Green Building Store Green Building Store


Green Building Store PROGRESSION Passivhaus certified timber window with narrow sightlines

Passivhaus-certified A-rated triple glazed timber inward opening window,  with minimalist, narrow sightlines and low maintenance design. Uw 0.68 W/m2K.


  • Passivhaus certified A-rated timber window
  • Contemporary ‘frameless’ appearance, with narrow sightlines
  • Inward opening with tilt & turn options
  • Ultra low maintenance Thermowood on exterior facings
  • Timber & cork* frame
  • Dual compression seals for long-term airtightness
  • Manufactured by Slavona in the Czech Republic
  • Exclusive to Green Building Store in the UK

*Or Compacfoam insulation

Glazing & U values
Whole window U value: Uw 0.68 W/m2K
Standard glazing U value: Ug 0.53 W/m2K (g value 0.50)
High g glazing U value: Ug 0.62 W/m2K (g value 0.62)

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Affiliations & Accreditations