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Buildings (both domestic and non-domestic) in EU are responsible for approximately 40% of the primary energy use. This makes buildings the largest 'energy-using-sector' in the Union. From the energy point of view, one can reduce consumption: by using building products that are sustainable (e.g. have little embodied energy), by designing and constructing buildings that use as little energy as possible with respect to heating, cooling, ventilation, etc. and by maintaining and operating buildings without wasting energy.
This is defined in EN 13829, § 6.1.2. All exterior surfaces, plus floors, ceiling and walls to neighbouring apartments are taken into account.
However, other assumptions are used in some countries to extract indicators that better fit the national requirements of the EP-regulations (see question regarding the measurement of multi-family buildings).
Anwered by: Rémi Carrié and Gaëlle Guyot (CETE de Lyon)
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