The methodology behind a Passivhaus building differs from some carbon neutral buildings, which use a combination of energy efficiency and clean energy generation to offset any energy use. A Passivhaus building aims not to use as much energy in the first place by being effectively sealed against the elements.
The actual construction methods of Passivhaus buildings will vary but they will all have some features in common, including:
- Far greater insulation than typical UK properties.
- Triple glazing, with insulated frames.
- Impressive airtightness levels (around 20x more than a standard build).
- Mechanical ventilation, with heat recovery system attached.