Spain's new Building Technical Code establishes minimum requirements for energy efficient buildings.
Source: European Commission

In 2006 the Spanish Council of Ministers approved a new construction standard through Royal Decree. This updates the old one dating from the 1970s and partially transposes the EU Directive 2002/91/CE on Energetic Efficiency in Buildings. The new standard, called the Building Technical Code (CTE - Código Técnico de la Edificación), establishes new quality, security, energy efficiency and habitability requirements for new or renovated buildings, thus creating a legislative framework that harmonises Spanish building standards with those of the European Union. This standard should also promote technological innovation and development.