Building Energy Rating (BER) explained in
A BER or Building Energy Rating is an
objective scale of comparison for the energy performance of
a building ranging from A1 to G. It is rather like the the A
to G rating for a household electrical appliance like your
fridge. A-rated homes are the most energy efficient and G
the least efficient. A BER certificate will be compulsory
for all dwellings being constructed, rented or sold after
1st January 2009.
BERs will be carried out by specially
trained BER assessors, registered by Sustainable Energy
Authority Ireland (SEAI). Only Registered BER Assessors can carry out
an official BER assessment and it must be submitted to SEAI
for publication on the national Register of BER Assessments.
Registered BER Assessors have successfully completed a
validated BER training course and exam provided by an
accredited training company.
The official method for carrying out a BER
for a dwelling is the Dwelling Energy Assessment Procedure (DEAP).
It consists of step by step calculations within a series of
individual modules. The modules deal with ventilation, heat
losses, domestic hot water, internal heat gains, solar heat
gains, mean internal temperature, space heat use, space
heating requirements, total energy use and fuel costs,
energy emissions and costs. The calculations emerging from
tBEHe modules are combined to produce an overall calculation
of annual energy demand and CO2 emissions. The dwelling is
then given a rating on a scale of A1 (best) to G (worst). A
detailed account of the standard BER procedure for Ireland
is set out under the heading ‘DEAP’ in this web site.
The DEAP methodology is based on standard
occupancy assumptions and a range of technical judgements
based upon the views of various expert organisations
regarding the energy efficiency impact of various building
components and attributes. In practice the energy efficiency
of a building will depend on how the occupants operate the
building. The BER for a dwelling may change over time due to
many factors including deterioration or modification to the
fabric of the building, changes to the heating systems
incorporating into the building or changes to the way in
which buildings are rated.