Who needs a BER?
A seller or landlord must provide a BER to prospective buyers or tenants when a home is offered for sale or rent.vThere are exceptions for certain categories of buildings e.g. protected structures and certain temporary buildings.
Who carries out a BER Assessment?
BER assessments are carried out by registered BER Assessors. A person offering a home for sale or rent, or their agent is required to engage a BER Assessor to carry out theassessment.
How is a BER calculated?
A BER is based on:
- The characteristics of major components of the dwelling (wall, roof and floor dimensions, window and door sizes and orientations).
- The construction type and levels of insulation.
- Ventilation and air tightness features.
- The systems for heat supply (including renewable energy), distribution and control.
- The type of lighting.
- It covers annual energy use for space heating, water heating, ventilation, lighting and associated pumps and fans, calculated on the basis of a notional standard family with a standard pattern of occupancy.
The energy performance is expressed as:
(a) Primary energy use per unit floor area per year (kWh/m2/yr) represented on an A to G scale (see BER certificate); and
(b) associated Carbon Dioxide (CO2) emissions in kgCO2/m2/yr (see BER Certificate)
A BER is only an indication of the energy performance of a house. Actual energy usage will depend on how the occupants operate the house. In that way it is similar to the concept of a fuel economy rating for a car (miles per gallon or litres per 100 km). A BER does not cover electricity used for purposes other than heating, lighting, pumps and fans i.e. does not allow for cooking, refrigeration, laundry etc.