Energy efficiency index for the building you can find:
If you do not have such documents, then you may estimate the annual energy demand for the building on your own - it is as follows:
| Building type |
Index [kWh/m²/year] |
Description (exemplary) |
| passive building |
5 – 15 |
Exterior insulation: passive insulation;
windows: 3-chamber (modern);
floor slabs and attic: very well insulated using the modern system; |
| low-energy building |
16 – 40 |
Exterior insulation: 20-30 expanded polystyrene;
windows: 3-chamber (modern);
floor slabs and attic: very well insulated |
| energy-efficient building |
41 – 50 |
Exterior insulation: 20-30 expanded polystyrene;
windows: min. 3-chamber;
floor slabs and attic: very well insulated |
| building with good thermal insulation |
51 – 60 |
Exterior insulation: 15-20 cm expanded polystyrene;
windows: min. 2-chamber;
floor slabs and attic: well insulated; |
| building with standard insulation |
61 – 90 |
Exterior insulation: 10-15 cm expanded polystyrene;
windows: older than 10 years;
floor slabs and attic: poorly insulated; |
| building with poor thermal insulation |
91 – 100 |
Exterior insulation: 5-10 cm expanded polystyrene;
windows: older than 10 years;
floor slabs and attic: poorly insulated; |
| non-insulated building |
120 – 150 |
Exterior insulation: none;
windows: older than 15 years;
floor slabs and attic: not insulated; |