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Cover page of the energy performance certificate (draft version):

Minimum energy performance requirements are expressed as an energy performance number. The energy performance number is calculated for the building on its standardised use. Data for the standardised use include a description of load profiles and indoor climate. The energy performance number depends on energy or fuel delivered to cover the energy demand in building – each source has an individual weighting factor (e.g. district heating 0.9, natural gas 1, electricity 1.5) that takes into account the environmental impact of particular source.

Minimum energy performance requirements are adopted for 6 different building types and they are set as follows: › small houses [for new buildings the energy performance number should not exceed 180 kWh/(year*m2), for existing buildings 250 kWh/(year* m2)];

› apartment buildings [for new buildings 150 kWh/(year* m2), for existing buildings 200 kWh/(year*m2)];

› office buildings [for new buildings 220 kWh/(year*m2), for existing buildings 290 kWh/(year*m2)];

The calculation methodology covers following elements:

1. Calculation of net energy demands



calculation of the net energy demand for the heating of premises (taking into consideration heat recovery, infiltration and warming of ventilation air on premises);

› net energy demand for heating ventilation air;

› net energy demand for the preparation of domestic hot water; › net energy demand for cooling.

2. Calculation of energy use by building services



calculation of the heat recovery, heat and electricity consumption of the ventilation system;



approximate calculation for the heating system based on heat production efficiency or the performance factor of the heat pump system and the electricity consumption of auxiliary equipment;



approximate calculation for the cooling system, taking into consideration any condensate and heat losses from the cooling system and the performance factor of the cooling period of the cold production;



calculation of electricity consumption by the electrical system in addition to the primary data on the use of lighting and equipment.

› public buildings [for new buildings 300 kWh/(year*m2), for existing buildings 390 kWh/(year*m2)];

› medical buildings [for new buildings 400 kWh/(year*m2), for existing buildings 520 kWh/(year*m2)];

› swimming pools [for new buildings 800 kWh/(year*m2), for existing buildings 1000 kWh/(year*m2)].

Besides the energy performance number, the summer indoor temperatures should be checked (there is an upper limit for the duration of high temperatures). If this criterion can not be fulfilled with the building design, the cooling energy demand should be taken into account in the energy performance calculations. This does not mean that the installation of cooling equipment is mandatory.

Minimum energy performance requirements do not set any mandatory criteria for any building part.

Calculation procedures

The calculation procedure is an integral part of the regulation on minimum energy performance requirements of buildings.

The regulation stipulates the input data (data of standardised use) that should be used in calculations. The results of calculation must be submitted in the form of cumulative energy use to maintain an indoor climate in a building (heating, cooling, ventilation and lighting), preparation of domestic hot water and use electrical equipment.

Requirements for existing non-residential buildings larger than 1000 m2

Minimum requirements for existing buildings apply when the building undergoes major renovation. Major renovation and the principles, how the renovation can be categorised as a major renovation, are defined in the Building Act. According to the act, renovation is considered to be a major renovation, if the costs of the renovation are higher than one third of average construction costs of a similar building. the Minister of Economic Affairs and Communications has issued a regulation (11.01.2008 regulation no 2; RTL 2008, 6, 64) for classification of the renovation, local governments should follow this regulation when they issue the building permit. The regulation sets the average construction costs of different buildings per square metre. The average construction costs are indexed in order to take into account the growth of construction costs.

EPBD Buildings Platform > P83 Estonia-June2008

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