Designed specifically for the growing UK Passive House market, we’re proud to present these cost-effective Passive House windows engineered from aluminium clad timber.

These windows combine all the natural style of timber internally with the practical ease of maintenance of external aluminium cladding. Side-hinged, they offer a choice of inward opening styles - either tilt only or tilt and turn.

With first-rate performance for air and water tightness, this window system is certified and compliant with the German Passivhaus Institute standards.

To maximise solar gains these triple glazed windows can be created in sizes up to 3 metres high; and we offer a choice of four glass types, hardwood or softwood frames and RAL colours.


Product guidance - As Standard
Frame 86 x 108 mm – Standard. Manufactured using mortise and tenon joints, glued and mechanically fixed.
Sash 78 x 92 mm - Standard.
Sill projection 50 mm, 70 mm, 90 mm, 110 mm, 130 mm, 150 mm, 225 mm, 300 mm, 360 mm
Wood moisture content 12–19%.
Glazing beads Internally Beaded.
Product specification
Material Engineered redwood - Standard.
Internal Finish Three coat spray applied factory finish using water based micro-porous paint/ stain.
External Finish Polyester Powder coating.
Colour White - RAL 9016 - Standard. Any RAL - from RAL classic range. Stain - from TRC stain range.
Glazing Triple glazed 4 Low-E /18/4/18/4 Low-E - Standard.
U-value 0.8 W/m²K.
Perimeter spacer bars White warm edge perimeter spacer with white warm edge integral spacers - Standard. Silver and Black spacer optional.
CAD Drawings
Alu Clad Passivhaus Windows
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