For a BER assessment in Ireland, give the registered BER assessor any available house plans, extension details, measured floor areas and information about insulation, windows, doors, heating, ventilation and renewable systems. Certificates or receipts for insulation, heating upgrades, solar panels and replacement windows may help verify the property’s construction and improvements. You should also provide the property’s address and, where available, its MPRN; the assessor will inspect the home and take measurements. If documents are missing, the assessment can usually still proceed, but assumptions may be needed and the final BER is determined from the information available.