Low-energy house (A, A+)

From 2016 in all European countries all new buildings (or parts of new buildings) will have to meet the requirements of energy performance class A and from 2018 all new buildings (or parts of new buildings) will have to meet the requirements of class A+ (information is taken from the EPBD – European Performance of Buildings Direction; Directive 2010/31/EU).


Engineering professionals who work in UAB Gildera are constantly improving their knowledge and seek that timber panel homes, which are manufactured in the company, would suit the highest requirements. Therefore, we suggest you to choose UAB Gildera prefabricated houses which meet the requirements of class A or A+.


Any house can be assigned to the A or A+ energy performance class if it has a well-insulated building structures, high-quality tightness system, heat-proof windows. Moreover, in A or A+ class house it is essential to seal all ‘cold bridges’ and install reliable mechanical ventilation system. In order to find out the best ways that help constructing houses of A or A+ class, it is necessary to determine what the energy performance is. Based on information provided by the law, energy performance (of a house, or part of a house) is described as amount of energy, necessary when a building is used according to its intended purpose. Energy performance is calculated in accordance to the applicable requirements and expressed by the energy efficiency class marked as C index.

According to the data of energy performance, A class building has a C index equal to <0,5 and A+ class house has a C index of <0,375. A or A+ class houses use a very small amount of energy (in comparison: a C index of a B class house is equal to <1). Qualities which distinguish A or A + class timber panel home from other type of buildings is a high level of energy efficiency and high-quality building structures. One of the greatest advantages of A or A+ class houses is that majority of energy needed for a house is obtained from the sources of renewable energy.

It is possible to claim that common provisions of how to reach A or A+ energy efficiency class for a house can differ according to the particular continent or country. However, technical parameters of A and A+ class houses are strictly regulated in accordance with the requirements provided by German Passive House Institute.


1.Thermal properties of a house (or part of a house) – expressed by coefficients of thermal conductivity (coefficients are provided in m2K/W value).


Coefficients of thermal conductivity are one of the most important indicators, which show that building (or part of a building) is properly assigned to the class A or A+. All the calculations connected with thermal conductivity of a house are made by our engineering professionals.

2.Tightness (air exchange)

High-quality tightness system of a house (or part of a house) is one of the most significant parameters which ensures that building is durable, safe and comfortable. So, if you properly care about a good tightness system, you can be assured that your house is protected not only from the cold weather, humidity but from the summer heat as well. While aiming for high quality tightness system, it is important to tightly connect separate house structures, and minimize ‘cold bridges’. A good tightness system in a house can also reduce the noise. According to the calculations, sound level in houses which need small amount of energy (class A, A+ and A++) is equal to 25 db (A).
The indicator which represents the level of air exchange in houses of A, A+ and even A++ classes is equal to n50≤0,6h-1.

3.Renewable energy sources

The use of renewable energy sources in houses of A or A+ class is another good quality which distinguishes such type of houses from other more simple buildings. The most commonly used renewable energy sources are: wind power, solar power, aero thermal, hydrothermal and geothermal resources, biomass and biogas. The choice of different renewable energy sources depends on individual project, country, in which the house is going to be built, and local climate conditions.

4.Mechanical ventilation system

It is essential to install a high-performance mechanical ventilation system, which creates a comfortable and pleasant for living climate, in houses which require a very low amount of energy. One of the most important tasks for this ventilation system is to properly use the air which flows in the house and outside of it. If mechanical ventilation system is properly installed, you can be sure that temperature in the house will stay the same. Moreover, high-quality mechanical ventilation system do not make any wind drafts and eliminate dust or any other small particles from the air which flows inside the house. For this reason, you can enjoy breathing fresh and clean air which flows all over the house.


Engineering professionals, who work in UAB Gildera, are constantly improving their knowledge to ensure that A or A+ class houses, which are produced in the company, would meet the highest requirements. So, choose our A or A+ prefabricated houses and enjoy not only the pleasant microclimate in your new house but also reduced house maintenance costs.

Sales manager Inga –inga@gildera.lt