PASSIVHAUS FAQs

Is Passivhaus only for houses?

No, the Passivhaus approach can be used for all buildings.

Do you have to use all the Passivhaus principles?

Ideally yes, as the principles are a whole building approach and work collectively. However, we appreciate that it is not always possible to use all five Passivhaus principles – the budget might not stretch to it, or the building might have too many limitations – but some of the principles can be used and good results can still be had. The only limitation is that if the first four passive principles are used to maximum effect, then MVHR becomes essential to provide adequate ventilation.

What is the payback period?

This depends on the type of building and the extent of the work undertaken. We have found that the payback period has reduced dramatically with the current energy crisis and significant increases in energy costs, making Passivhaus even more attractive. For example, when Churwell project was started in 2016 the payback period was 12-15 years, recalculating this at the end of 2022, the payback period was reduced to 4-5 years.

How much extra does Passivhaus cost?

Again, it depends on the project and specification, but we find that Passivhaus construction can typically add about 10-20% to the construction cost. This is due to better quality (generally natural) materials and the requirement for a higher standard of workmanship.

It seems complicated – why bother?

To achieve Passivhaus design and construction, the design and build process is more involved than a traditional type of construction. However, these extra steps are worth it in the finished building. This attention to detail adds up to something amazing and worth the extra work – it might seem like a faff but when you are able to enjoy a space all day long with no draughts and an even constant temperature you can feel smug!

Sometimes we find that building additional area isn’t needed as when the existing spaces are well insulated and airtight every square inch can be used. Uninsulated or poorly insulated spaces repel you – who wants to sit next to a cold wall! It makes your rooms shrink in the colder months. In a Passivhaus you can snuggle up to the walls and windows in the cold months – you can comfortably sit next to a triple glazed window when it is snowing outside.

What are the disadvantages of Passivhaus?

There are some additional upfront build costs, but these can be offset against the potential energy savings and the other benefits. We sometimes find a shortage of contractors knowledgeable and experienced in Passivhaus, but we are finding that this is improving and we are developing a network of competent builders.