Sustainable Design

Passivhaus homes are built using a Fabric First approach, prioritising the performance of the building envelope from the outset. This means designing walls, roofs, floors, windows, and junctions to minimise heat loss and maximise efficiency before adding technologies.

Key elements include very high levels of insulation, exceptional airtightness, and careful detailing to eliminate thermal bridges. High-performance windows are positioned to optimise solar gain, while Mechanical Ventilation with Heat Recovery (MVHR) provides fresh air while retaining heat.

Build quality is essential. Systems such as timber frame or SIPs are often used to ensure precision and airtightness, supported by on-site testing. The result is a comfortable, low-energy building that requires minimal heating or cooling.

Yes—but very little. A Passivhaus building still requires some form of heating, but the demand is dramatically reduced due to its highly efficient fabric.

Because of high levels of insulation, excellent airtightness, and heat recovery ventilation, most of the heat comes from passive sources such as sunlight, occupants, and everyday activities. Any additional heating is typically minimal and can often be provided through a small system, sometimes integrated into the ventilation system itself.

The result is a home that stays consistently comfortable year-round, with very low energy use compared to conventional buildings.

Yes - existing buildings can be upgraded to meet Passivhaus principles, but achieving full Passivhaus certification is often challenging due to structural, spatial, and heritage constraints. Instead, many retrofit projects follow the Passive House Institute’s EnerPHit standard, which sets ambitious yet more achievable targets for existing buildings.

A Passivhaus-level retrofit focuses on improving the building fabric as much as possible: adding high levels of insulation, significantly improving airtightness, reducing thermal bridges, and installing high-performance windows and ventilation with heat recovery. The extent of these upgrades depends on the condition and limitations of the existing structure.

While not every building can reach full Passivhaus certification, it is often possible to achieve very low energy performance through a well-designed, fabric-first retrofit- dramatically improving comfort, reducing energy use, and extending the life of the building.

Passivhaus buildings are typically more expensive to construct than conventional buildings, largely due to the higher specification of materials, the precision required on site, and the detailed design and coordination involved. Achieving the standard also includes a formal certification process through the Passive House Institute, which adds further cost and requires rigorous modelling, documentation, and verification.

The additional investment is generally associated with enhanced insulation, high-performance windows, exceptional airtightness, and mechanical ventilation with heat recovery, as well as the time needed to carefully design and deliver these elements correctly.

However, these upfront costs are balanced by significantly lower energy bills, reduced maintenance, and improved comfort over the building’s lifetime. With the right approach, Passivhaus can still represent strong long-term value, despite the higher initial outlay.

No—Passivhaus homes don’t have to look any different from conventional buildings. The standard is based on performance, not style, so it can be applied to a wide range of architectural expressions, from traditional to contemporary.

While the design process may influence certain elements—such as window placement to optimise solar gain or slightly thicker walls due to increased insulation—these are typically subtle and can be fully integrated into the overall design.

In practice, a Passivhaus building can look however you want it to. The focus is on what’s happening beneath the surface: a highly efficient, comfortable, and well-performing building that doesn’t compromise on aesthetics.

Yes - Passivhaus is very well suited to the UK climate. In fact, it performs particularly well in the UK’s temperate conditions, where reducing heat loss during long, cool seasons is key.

The standard was developed in a similar Northern European climate, so its principles—high insulation, airtightness, and heat recovery ventilation—are highly effective at maintaining comfortable indoor temperatures throughout the year. Passivhaus buildings also manage summer conditions well, using shading, ventilation, and careful design to prevent overheating.

In the UK context, this results in homes that are warm in winter, comfortable in summer, and consistently low in energy use, making Passivhaus a highly appropriate and proven approach for our climate.

No - you don’t need Passivhaus certification to benefit from Passivhaus principles.

Many projects choose to adopt a “Passivhaus approach,” using the same core strategies—high insulation, excellent airtightness, reduced thermal bridging, and heat recovery ventilation—without going through the formal certification process set by the Passive House Institute.

Certification does provide independent verification that the building meets the standard, which can be valuable for quality assurance, funding requirements, or long-term performance guarantees. However, it also involves additional cost, documentation, and time.

In many cases, it’s possible to achieve very similar levels of comfort and energy performance without certification, by focusing on good design, careful detailing, and high-quality construction.

Yes. We act as your point of contact and liaise with the local authority throughout the process.