The energy performance of buildings directive 2002/91/EC is mandatory for all types of buildings and defines the design criteria that should be applied in order to assess the energy classification of buildings. The maximum U-values (Heat transfer coefficient) of building elements are defined, according to the four climatic zones of Greece A,B,C and D, given in the directive.
The Ministry of Environment, Energy and Climate Change in the context of promoting the use of renewable energy, reduce greenhouse gas emissions and support green business announced in 2009 the launch of a Special Development Program Photovoltaic until 10 kWp, in Building facilities used for housing or housing micro enterprises
According to the Greek legislation on Photo-voltaics, from the Ministerial Decree 36720 ΦΕΚ 376, a PV system up to 100 kWp can be installed on the roof of the building or façade, louvers without a building permit. The owner of the building should own the space where the system is installed and no special permits are required. The owner should firstly make an application to the local electricity utility, with a written notification and report of the installation study and energy efficiency of photovoltaic systems to the network administrator or other supplier that electrifies the building which has the photovoltaic system, which is signed by the engineer concerned and supervisor for the installation and serving as a declaration on their construction, responsible for legal compliance with the terms of this Decision.
For a system having a power greater than 100 kWp, a small-scale construction permit should be issued in accordance with No. oik. 5217/3.2.2004 (GG D 114/17.2.2004) Ministerial Order.
According to the Article 16 of n. 1577/1985, PV systems and solar cooling and heating blocks should be integrated with other structures where applicable, so they do not affect the aesthetics of the building and the environment.