This European Standard specifies the calculation method, based on Life Cycle Assessment (LCA) and other quantified environmental information, to assess the environmental performance of a building, and gives the means for the reporting and communication of the outcome of the assessment. The standard is applicable to new and existing buildings and refurbishment projects.The standard gives:- the description of the object of assessment;- the system boundary that applies at the building level;- the procedure to be used for the inventory analysis;- the list of indicators and procedures for the calculations of these indicators;- the requirements for presentation o