If the non-European worker is a domestic servant, there are certain cases in which they must apply with Brussels Economy and Employment for an authorisation.
The domestic servant will be working in the Brussels Capital Region for more than 90 days.Apply for a single permit
The domestic servant will be working in the Brussels Capital Region for maximum 90 days.Apply for a work permit
(In case of successive jobs, the previous periods will be taken into account for the calculation of the 90 days. If the 90 days are exceeded, see the procedure for a single permit.)
The domestic servant will be accompanying tourists in Belgium for maximum 90 days. (art. 2,13)
You do not need to ask Brussels Economy and Employment for employment authorisation in order to work in Belgium. (automatic exemption by virtue of article 2, 13° of the royal decree dated 9 June 1999).