Law 3661/2008 on Measures to reduce energy consumption in buildings and other provisions
This law sets up the minimum requirements for energy efficiency in new and existing buildings, adopting a methodology for the calculation of energy consumption in buildings. It makes energy performance certificates compulsory in all new buildings. Also, for large buildings (exceeding 1,000 total sq. m) under renovation whether to be sold or rented, their energy efficiency is to be upgraded, when it is technically and economically feasible, to the minimum requirements of the energy efficiency regulation set by this law. The law also requires the licensing procedures for buildings to include a study on passive solar system heating/cooling/electricity production systems that uses renewable energy.