To discuss your project give us a call on 01392 861763

How does a passive house work?

Find out more about the passive house standard of building.

Passivhaus buildings work by ensuring that very little heat is lost through the fabric of the building, that is the floors, walls and roof. This is done by careful design and construction and ensuring that there are no breaks (thermal bridges) in the insulation layer which allow heat to escape and by making the building very airtight to stop drafts. They also use a heat recovery ventilation system, called MVHR (mechanical ventilation heat recovery), which ensures that you have plenty of fresh air all the time. The stale air that is being extracted has up to 90% of the heat passed back in to the incoming air meaning very little heat is lost. This allows the building to use the heat given off by the people in it and what they do to keep it warm. Because of this you have a reduction in your heating bill of upwards of 85%.

Compared to our last house I think we’ve reduced the heating bill in our passivhaus by around 95% using the Unger-Diffutherm wood fibre insulation systems in a timber framed house. Contact us if you’d like to know more.

CPD Training

We offer CPD training for architects practices across Devon and Cornwall.

Software Modelling

We offer dynamic heat and moisture modelling as well as condensation risk analyses.

Building Plan Review

If you have some plans and would like our opinion on which materials would be the best for you, contact us.


Back to Earth is a natural building material supplier. We're not your typical builders'​ merchant though and instead work closely with our clients during the planning, designing and building phases of projects.

Back to Earth is a proud signatory of the Anti-Greenwash Charter:

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