The right to privacy or private life is enshrined in the Universal Declaration of Human Rights (Article 12), the European Convention of Human Rights (Article 8) and the European Charter of Fundamental Rights (Article 7).

Article 8 Everyone has the right to respect for his private and family life, his home and his correspondence. There shall be no interference by a public authority with the exercise of this right except such as is in accordance with the law and is necessary in a democratic society in the interests of national security, public safety or the economic well-being of the country, for the prevention of disorder or crime, for the protection of health or morals, or for the protection of the rights and freedoms of others.

Article 7 Respect for private and family life Everyone has the right to respect for his or her private and family life, home and communications.

The EU has treaties which serve as a constitution of sorts – duties, powers, and limits of the EU, and its legal relationship with its member states. These treaties are signed by all member states and together make up the EU's constitutional basis.

New treaties are signed every now and again with the purpose of amending, extending and redefining previous ones.

There's e.g. the Maastricht Treaty (1997) which laid the ground work for a single currency and strengthened the power of the European Parliament (each member state has a number of seats and the representatives are elected nationally by a public vote).

The most recent one is the Lisbon Treaty (2009), which among other things, again, shifted the power balance in the EU in favour of the Parliament. It also strengthened EU's position as a full international legal personality. Other changes were to make the union's Charter of Fundamental Rights legally binding and to explicitly allow a member state to leave the union.

There's no EU Constitution, but there is the European Court of Human Rights.