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Low-energy houses

Low-energy houses, as the name says are houses with lower power consumption. Their annual heating requirement is 15-50 kWh/m2.
 A Low energy house of 150 m2 uses annually 2250-7500 kWh.

Passive houses are houses where annual energy consumption is less then15 kWh/m2.
 Passive houses are houses whose annual heating demand is less then 15 kWh/m2. A passive house of 150 m2 uses less than 2250 kWh per year.

All EU countries, as well as Croatia, have enacted laws on energy conservation, according to which all the houses have to be grouped into energy efficiency classes, according to the annual energy consumption of energy per m2 (from A + to G).

A+ do 15 kWk/m2a Passive house
A 15-25 kWh/m2a Low energy house
B 25-50 kWh/m2a Low energy house
C 50-100 kWh/m2a  
D 100-150 kWh/m2a  
E 150-200 kWh/m2a  
F 200-250 kWh/m2a  
G preko 250 kWh/m2a  


The advantages of low-energy houses compared to conventional houses

Low-energy houses compared to conventional are:


  • Construction of a classic house is 30 to 40% more expensive. Although materials, such as brick and concrete are relatively cheap, the total interior and exterior setup makes this form of construction much more expensive.


  • Due to the excellent thermal insulation, annual heating savings of this house type are at least 1000 €. Due to the rapid growth of energy prices, this savings will increase each year significantly. Therefore low-energy houses are the future fundamental form of housing construction.


  • The new materials, that are being used in the construction of low-energy prefabricated houses, are: dry impregnated wood, OSB wood panels, mineral wool, gypsum board, etc. These materials have much less harmful radiation compared to the materials used in conventional construction (brick, concrete and, especially, iron armature).
    There is no moisture in these houses. In conventional houses uneven heating of rooms, cold walls and especially cold floors may cause health problems (infections, colds). In the low energy houses these problems do not exist. Many of the world's analyzes show that people living in low energy houses have longer lifespan.