Celebrated on the first monday in october each year . Currently, societies worldwide demand the need to create a sustainable architecture . This is to change our way of conceiving architecture in order to implement a sustainable building system that is respectful of the environment and people. At the same time it must be energy efficient and make optimum use of the natural resources available to us. Bim ( building information modeling - collaborative work methodology in building based on a three-dimensional virtual prototype-) contemplates, in one of the design phases of the bim architectural project,
dimension number six: " sustainability ". This dimension encompasses the energy analysis of the building, the variations and iterations of the envelope and leed monitoring (leadership in energy & environmental design - certification system for sustainable buildings -). Once it is definitively implanted in spain, the new way of building in our country will begin to be a reality, just as it happens in e commerce photo editing other countries in europe or america. It will be the beginning of an effective implementation of a sustainable systemin the building that will be perfected over time. Importance of energy certification sustainable architecture for a building to be habitable, optimal health and comfort conditions must be achieved and maintained inside, allowing for thermal well-being at adequate humidity. We must take action to minimize the
negative impact on the environment and reduce energy demand, whether by renovating buildings or implementing sustainable projects now and in the future. In spain there is a basic procedure for the certification of the energy efficiency of buildings, which is included in royal decree 235/2013 of april 5. This law requires an energy efficiency certificate to be made available to