A BER Certificate, or BER Rating is a Building Energy Rating provided by a qualified BER Assessor, which shows how energy efficient a property is.
Following the Kyoto Protocol in 1997, The Irish Government, along with many other countries, agreed to reduce it's greenhouse gasses and other harmful emmissions. One way to achieve this has been to introduce the BER scheme, which will show prospective buyers and tenants how energy efficient a property is and therefore encouraging landlords and home owners to increase their properties energy efficiency.
The more efficient a home is, the less it costs to heat and the less fossil fuels are required to maintain it and in turn the more attractive it is to future tenants or owners.
As a result, it is now compulsory in Ireland when offering a property for sale or rent, to show it's energy efficiency rating, or BER Rating.