Willow Barn Detached Shell — Ultra-Low Energy Prefabricated Home
Key Features
- Two-storey detached barn-style home supplied as a closed-panel shell for onsite fit-out
- Built with the HAUS Passiv Wall system (472.2 mm wall thickness) for exceptional performance
- Outstanding thermal efficiency with a U-value of 0.10 W/m²K
- Superior soundproofing with acoustic ratings exceeding 48 dB Rw
- Fire resistance REI 60 as standard, upgradeable to REI 90
- Open-plan living layouts and large-format glazing options available
- External finishes fully customisable: brick-slip, render, timber, stone-slip, or metal cladding
- Delivered for rapid onsite assembly, significantly reducing construction timelines
- Fully compliant with Future Homes Standard and Passivhaus energy targets
- Flexible system — send your plans for bespoke quoting and configuration
HAUS - Passiv Wall U-Value 0.10 (W/m2k)
The HAUS Passiv Wall is a high-performance closed-panel timber solution designed for ultra-low energy buildings. With a total thickness of 472.2 mm, it achieves an outstanding U-value of 0.10 W/m²K, sound reduction above 48 dB, and fire resistance rated REI 60, upgradeable to REI 90. Engineered for maximum thermal performance, airtightness, and design flexibility with a full range of external cladding options.
Pitched Roof HAUS Passiv U-Value 0.11 (W/m²K)
The HAUS Passiv Pitched Roof is a highly insulated prefabricated roofing system engineered for superior energy performance. With a construction thickness of 492.9 mm (excluding the roof covering), it achieves an excellent U-value of 0.11 W/m²K and a sound reduction of over 51 dB. The multi-layered structure integrates mineral wool insulation, a vapour barrier, flexible waterproofing membranes, and robust timber construction for outstanding airtightness and thermal stability. Fire resistance is REI 30, upgradeable to REI 60. The system supports a range of roof finishes—traditional clay, fibre cement, zinc, slate, or solar PV—delivering both performance and architectural flexibility. Ideal for sustainable pitched or sloped roof applications.
Triple Glazed Windows
All prefabricated house shells are provided with triple glazed windows as standard with a heat reflective coating to keep the warmth inside and to maximise solar gain from the winter sun, with a Ug Value of 0.5 W/m2K for the glass and UW Value of 0.86 W/m2K or better at the frame, with a wide range of to choose from.
Entrance Doors
A wide range of quality entrance doors to choose from various; RAL colours, designs and finishes, that incorporate safety security locks and are equipped with quality fittings. All doors are manufactured to the highest standards.
| Wall Types | Specification | Roof Types | Specification | Windows & Sliding Doors (double or triple glazed) | Specification | Entrance Doors | Specification |
|---|---|---|---|---|---|---|---|
| Eco Wall | U-Value 0.15 (W/m2K), ≥ 48 (dB), REI 60 or 90 | Pitched Roof Passiv | U-Value 0.11 (W/m2K), ≥ 51 (dB), REI 30 or 60 | uPVC | Uw value: 1.2 > 0.8 W/m²K | uPVC | Ud value: 1.0 > 0.87 W/m²K |
| Net-Zero Wall | U-Value 0.12 (W/m2K), ≥ 48 (dB), REI 60 or 90 | Flat Roof Passiv | U-Value 0.10 (W/m2K), ≥ 45 (dB), REI 30 or 60 | uPVC/Aluminium | Uw value: 1.2 > 0.85 W/m²K | Aluminium | Ud value: 1.0 > 0.85 W/m²K |
| Passiv Wall | U-Value 0.10 (W/m2K), ≥ 48 (dB), REI 60 or 90 | Aluminium | Uw value: 1.4 > 0.9 W/m²K | Wood | Ud value: 1.0 > 0.86 W/m²K | ||
| Wood/Aluminium | Uw value: 1.2 > 0.8 W/m²K | ||||||
| Wooden Windows (casement or sash) | Uw value: 1.3 > 0.85 W/m²K | ||||||
| Notes: | Facade multiple finishes e.g. brickslip, render, timber clad, stone-slip etc.. | Roof multiple finishes e.g. clay tile, fibre cement, zinc, solar PV, bitumen, EPDM, sedum green roof etc. | Window multiple finishes and colours e.g. uPVC, aluminium, timber, alu-clad timber etc. | Entrance doors multiple styles, finishes, and colours available. | |||
| Foundation Types e.g. | Insulated raft | Strip foundations | Piled foundations | Basement structures | Concrete slab | Pad foundations | Suspended beam and block |
