Have your house plans, details of the construction year and any invoices or certificates for insulation, windows, heating systems, solar panels or other energy upgrades. Your assessor may also ask for information about the boiler, controls, ventilation, renewable technologies and the home’s dimensions. The MPRN may be needed when registering the BER, while planning or completion documents can help confirm the property details. If paperwork is missing, the assessor can usually inspect the home and use standard assumptions, but this may affect the assessment. Ask your chosen SEAI-registered assessor what evidence they require before the visit.