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Building Energy Rating (BER) describes energy performance of a dwelling on a scale from A to G. The scale contains 15 levels, from A1 (the best rated homes) to G (the least efficient). Properties built to current Building Regulations standard (TGDL 2011) should achieve rating in the A range.
BER is based on the energy balance taking into account factors that contribute to annual energy usage for space and water heating, ventilation and lighting. These factors include: size and geometry of the dwelling, building materials, ventilation characteristics, efficiency and control of heating systems, solar gains, etc.
BER calculation is made using standardised assumptions regarding occupancy, with a standard pattern of behaviour, like levels and durations of heating, usage of domestic electrical appliances, etc.
BER is only indication of energy performance of a house. The actual energy usage will always depend on how specific occupants operate the house. Detailed information on BER methodology can be found on SEAI's website: www.seai.ie.
See how the certificte looks like here.
 
 
 
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