Unit1, Building 3, Port link Business Park, Port Road, Letterkenny, Co.Donegal

BER Explained

What is Building Energy Rating (BER)?

A building energy rating is a rating on the overall energy efficiency of a building (residential or commercial). The rating is similar to the energy label on your fridge and is denoted on scale of A to G, with A1 being the most energy efficient and G being the least energy efficient.

BER Certificate

The certificate contains the following information:
The building name and address, a BER number, the date of issue, the date until when the BER is valid, the BER assessor number and the BER assessor company number.

How long is a BER certificate valid for?

A BER certificate is valid for a period of up to 10 years while there are no changes made to the dwelling that will negatively affect its energy performance.

How is BER calculated?

A BER for a house is calculated using the Dwelling Energy Assessment Procedure (DEAP) software published by Sustainable Energy Ireland (SEI). The DEAP software will also calculate the carbon dioxide emissions associated with the house. The BER calculation includes energy use for building fabric, space heating, water heating, ventilation and lighting and is calculated on the basis of standard occupancy.

Why is a good BER Rating important:

  • A good BER rating will save you money in heating costs for your home
  • Easier to sell house in future with a good BER Rating

Ways to achieve a good BER Rating:

  • Install a renewable Energy source
  • Insulation with a good U-Value (lower the better)
  • Install heating controls
  • Using Triple glazed windows instead of Double glazed (lower U-Value)
See below the costs saving between a Good BER rating & Bad BER Rating:

The estimated annual fuel costs are based on a typical occupancy and heating of the house to a comfortable level. (200m2) (from SEAI Website)

In order to demonstrate compliance with the 2011 Revisions to Building Regulations the following criteria must be met:
  • Achieve the Energy Performance Coefficient (EPC) of less than 0.4, using the DEAP Assessment
  • Procedure for the energy rating of dwellings.
  • Minimum Acceptable U-value Standards.
  • Prevention of Cold Bridging & the limitation of Air Leakage.
  • Demonstrate an Air-tightness by testing of less than 7m3/h.m2 @ 50Pa
  • Provide 10 kWh/m2/annum contribution from Renewable Energy Technologies contributing to energy use for domestic hot water heating, space heating or cooling; or 4 kWh/m2/annum of electrical energy