Naturalisation is a concessionary measure granted by the House of Representatives. In contrast to the declaration procedure or the normal choice of nationality, in this case foreigners have no right to Belgian nationality, but the House may nevertheless grant Belgian nationality as a concession.
You can either apply for naturalisation directly to the House of Representatives, or through the Registrar in the municipality where you have your main place of residence.
Once the dossier is complete, the Registrar will forward your application to the House of Representatives. The House will then take a decision over granting naturalisation. The public prosecutor's office, the Aliens Office and the National Security Department will all be consulted. The Naturalisation Act takes the form of a law. You are Belgian on the day on which the law appears in the Belgisch Staatsblad/Moniteur belge.