What is Passivhaus? 

Passivhaus is a leading international low-energy standard for buildings. First developed around  20 years ago, it has been generating much more interest in the UK over the past five years or so.

It is based on sound building physics to reduce energy consumption by design, and results in simple, robust, long-lasting and energy-efficient buildings.

A Passivhaus building  uses typically around 80% less energy than the majority of our existing buildings.

Whether you are motivated by concerns over global warming, worries about the increasing costs of gas and electricity or just want a comfortable environment with excellent air quality, a Passivhaus approach may provide the solution.

How is a Passivhaus different from a conventional building? 

A Passivhaus building is so well insulated and so airtight that the heat inside the building is retained.The first response from most people is “Well how do you breathe, and how do you get fresh air?”
Passivhaus buildings use mechanical ventilation to deliver a constant supply of fresh, clean air to all parts of the building. The air is drawn in through dust and pollen filters so the air quality is excellent. This fresh incoming air is pre-heated (in winter) by passing through a heat exchanger.

The heat exchanger uses the heat contained within the air being extracted to pre-warm the cooler external air coming in without actually mixing/cross contaminating the air.

The heat exchangers are very efficient – typically saving nine times more energy than they consume!
The same principles can be applied to retrofitting existing buildings. We are currently on site with a stables conversion which we hope will achieve the Enerphit standard (a Passivhaus standard for existing buildings).