This document is applicable to specific energy audit requirements in buildings. It specifies the requirements, methodology and deliverables of an energy audit in a building or group of buildings, It is applied in conjunction with, and is supplementary to, EN 16247-1, Energy audits Part 1: General requirements. It provides additional requirements to EN 16247-1 and is applied simultaneously. If processes are included in the scope of the energy audit, the energy auditor can choose to apply EN 16247-3, Energy audits Part 3: Processes. If on-site transport on a site is included in the scope of the energy audit, the energy auditor can choose to apply EN 16247-4, Energy audits Part 4: Transport.