Understanding Building Energy Rating (BER)
Understanding Building Energy Rating (BER)
Embedded Files
What is the Building Energy Rating (BER)?
The Building Energy Rating follows the same principle as the appliance energy rating. Buildings are rated on their energy efficiency from A to G, A being most energy efficient and G being least energy efficient. A-C are further subdivided into A1, A2 and A3, etc.
The BER takes into account the energy used for space heating, water heating, ventilation and lighting and either calculates or measures energy usage per floor area unit per year (kWh/m2/yr). CO2 emissions are also being taken into account.
Why is it important?
The BER is used as baseline for home energy upgrades and gives the homeowner an estimate on how much energy and money could be saved if certain upgrades (e.g. insulation) are being implemented.
The BER also has an impact on the resale value of the property, the higher the rating the higher the asking price.
What impacts the BER?
Age of the building/time of construction
If actual information on the building (type of built, insulation, etc.) does not exist the default values typical for the year of construction are being applied.
Floor area
Floor area is based on internal dimensions. Unheated spaces separate from the main building are not being taken into account.
Thermal insulation
Thermal insulation in the attic, wall and floor has a big impact on energy consumption. Poorly insulated homes can loose 20-30% of the generated heat through the walls plus a further 30% through the attic/roof.
Windows and doors
Windows and doors can contribute 10% to the heat loss depending on glazing, frame type and how well the windows and doors are being maintained.
Light fitting
The type of lighting (LED or older types) impact the overall energy consumption and are therefore part of the BER.
Heating system
The efficiency of the heating system depends on its age and state of maintenance. Newer oil and gas systems are more energy efficient than older ones. The use of renewable heating systems like heat pumps and solar further improves the energy rating.
Page updated
Report abuse