An Irish BER certificate is generally valid for up to 10 years, unless significant changes to the property affect its energy performance. The cost is not fixed and can vary by property size, location, and the registered BER assessor, with many domestic assessments costing roughly €100–€300. You should request a written quote before booking and check that the assessor is registered with SEAI. GrantWise is an independent information site, so confirm the current requirements and any applicable fees directly with SEAI or your chosen assessor.