National BER provides you with the Best BER Assessment in Toberroe. Your BER is calculated based on the amount of energy your home requires for space heating, hot water heating, ventilation, the building fabric and lighting. In order to complete this calculation, your BER Assessor will need to collect information on various aspects of your home. To collect this information, your BER Assessor will need access to all areas of your home including the attic, lighting systems and more.