Achieving a Uw of 0.79 W/m²K, our Passivhaus Aluclad windows are engineered from a timber core clad in durable aluminium. These windows address heat loss, thermal bridging, and air leakage at the frame level, making them an integral part of any building envelope designed to passive house standard.
Full specification for the Zyle Fenster Aluclad Passivhaus window – for use in passive house certification documentation and project specifications.
| Product guidance – as standard | . |
| Frame | 78 x 108 for Triple Glazed Europa window. Manufactured using mortise and tenon joints, glued and mechanically fixed. |
| Sash | 37 x 108 mm – Standard. |
| Sill projection | 110 mm, 150 mm, 180 mm, 210 mm. |
| Wood moisture content | 12-19% |
| Glazing Beads | Internally beaded. |
| Product specification | . |
| Material | Engineered redwood – Standard. |
| External finish | Polyester powder coating. |
| Glazing | Triple glazed 4 Low-E /18/4/18/4 Low-E – Standard. |
| Perimeter spacer bars | White warm edge perimeter spacer with white warm edge integral spacers – Standard. Silver and Black spacer optional. |
| Internal finish | Three coat spray applied factory finish using water based micro-porous paint/ stain. |
| Colour | White – RAL 9016 – Standard. Any RAL – from RAL classic range. Stain – from TRC stain range. |
| U-value | 0.79 W/m²K. |
The passive house building standard demands exceptional control over heat loss, air leakage, thermal bridging, and energy consumption throughout the building envelope. Windows and doors are among the most thermally vulnerable components in any façade, and achieving passive house certification requires glazing that genuinely meets passive house requirements – not merely approximates them.
Developed in direct response to the growing demand for certified low-energy construction across the UK, these windows are cost-effective without compromising on the high levels of insulation and air tightness that passive house design requires. They are equally suited to new-build passive house projects, EnerPHit renovation schemes, and any project targeting energy use and carbon reduction beyond current building regulation standards.
Thermal bridging at the window frame is one of the most common causes of underperformance in otherwise well-insulated buildings. Our Passivhaus window addresses this through careful frame geometry, warm edge spacer bars, and triple glazing with dual Low-E glass – all of which work together to minimise heat transfer at every point in the assembly. The result is a window that contributes measurably and consistently to the building’s overall thermal insulation and energy efficiency performance.
The aluminium exterior finish provides long-term durability and weather resistance, while the engineered timber core maintains a warm, natural internal character. Available across the full RAL classic colour range, these windows can be specified to complement any architectural palette – giving architects and clients both the technical performance of a passive house window and the design flexibility expected of a premium Aluclad product. For projects demanding the highest standards of energy efficiency, this is the specification to consider.
Key questions about our certified Aluclad Passivhaus windows, answered for architects, Passivhaus consultants, and self-build clients.
Contact UsOur Aluclad Passivhaus windows achieve a Uw of 0.79 W/m²K, meeting the thermal performance thresholds required by the German Passivhaus Institute for passive house certification.
Heat loss is reduced through triple glazing with dual Low-E coatings, warm edge spacer bars, a thermally optimised timber frame, and aluminium cladding with thermal breaks – all of which minimise heat transfer and thermal bridging at the frame.
Yes. Specifying high-performance Passivhaus windows with a Uw of 0.79 W/m²K contributes directly to improved Building Energy Ratings by reducing overall energy consumption attributable to fabric heat loss.
Yes. As well as new-build passive house projects, our Passivhaus windows are well suited to EnerPHit renovation schemes where the building envelope is being upgraded to meet passive house requirements in an existing building.
Whether incorporated into a modern contemporary new build or unlocking a period property, our curtain wall can reinvigorate a property by letting the natural daylight come flooding in.
Find out more about Dollar, ScotlandA complete service
from design to installation.
Zyle supplied Passive House windows for our new build, and the system met all project expectations. Airtightness and overall performance were delivered as specified, and their technical coordination on site was reliable and detail focused.
Private Owner
Mark Reynolds, Bristol
Our vacuum glazed sash windows provide an excellent balance between heritage sensitivity and modern performance. The slim glazing preserves the character of the property while significantly improving overall comfort. Installation was precise and professionally managed.
Private owner
Laura Mitchell, Southampton
The Passive House windows performed exactly as required within our project specification. Installation detailing, sealing, and overall execution were handled correctly, ensuring a high standard of delivery. A technically competent and reliable supplier.
Private Owner
Andrew Collins, Cambridge
We selected aluminum windows for their contemporary aesthetic and low maintenance. The proportions are well considered, and the finish quality is consistent throughout. Installation was efficient and carried out with strong attention to detail.
Private Owner
Rachel Adams, Reading
The triple glazed sash windows integrate seamlessly into the existing façade while offering a clear upgrade in comfort. Craftsmanship is evident in both joinery and installation, and the improvement in acoustic insulation is immediately noticeable.
Private Owner
Thomas Green, Nottingham
The Alu-Clad windows and doors introduced a strong architectural presence while maintaining a refined internal finish. Detailing, material quality, and consistency across the project are of a high standard. The process was structured and dependable from start to finish.
Private Owner
Olivia Bennett, Oxford
Whether you are an architect specifying for a new project, a self-builder planning your custom home, or a developer working to a programme, our team is here to help. Get in touch for technical advice, product information, or to request a quote.
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