From the 1st of January 2017 onwards, the filing of a translation with the Belgian Intellectual Property Office will not be required any longer in Belgium for European patents delivered in English.
This new regime will only be applicable to European patents of which the mention of the grant or the maintenance, in amended or limited form, are published from the 1st of January 2017 onwards.
If the mention is published before that date, the filing of a translation of the European patent will still be required.
See here the letter of the Belgian Intellectual Property Office of 30th of September 2016.
Fernand de Visscher and Eric De Gryse