|Passivhaus, Herefordshire, 2016|
|Low energy buildings, Pennyland, 1979|
The theory behind Passivhaus is that increasing insulation means massively reducing the heating system, so extra costs insulating are balanced by lower costs installing a heating system. Since Passivhaus also required a ventilation system, and rather than removing the heating system it just scales it down, this seems like a challenge. The cost of extra insulation, structural changes to accommodate and support the insulation, airtightness barriers, increased window specs and ventilation system all need to add up to less than a fraction of the heating system.
|State of the art building, Lavenham Wool Hall, UK, 1464|
According to this report from the Passive House Trust, sponsored be AECOM, passive houses cost 3-8% more in Germany, where many are built to the standard. In the UK they typically cost 15-20% extra, although the extra costs are less for large projects, terraces, north-south oriented buildings, and projects where the design can change after tender.
But some people are saying that Passivhaus can, and will cost no more, for example Passivehouse Plus in Ireland give the builder's view on why passive house doesn't cost extra.
|Low cost, zero maintenance house, Japan|
And they answer: YES!
|Bird Table, Huddersfield, |
Turn of millenium
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