Advance and official notice

The Urbanism service issues two types of opinions: preliminary opinions and formal opinions.

Preliminary opinions

A preliminary opinion can be obtained directly from the Urbanism service. In view of the more complex analysis for the construction of wind turbines a lump sum of ‚ā¨ 900,00 is charged.

Preliminary opinions are valid for a 2-year period. Within that 2-year timeframe the applicant can request the preliminary opinion to be extended. In case of extension of the preliminary opinion and of requests for formal opinions the requested erection of the obstacle is retested against the evaluation criteria. That may result in the preliminary opinion to be derogated from.

Formal opinions

Belgocontrol receives requests for formal opinions through the Belgian Civil Aviation Authority (BCAA), the Omgevingsloket voor Vlaanderen or through other public authorities.

Formal opinions remain valid for the duration of the authorization granted for the erection and exploitation of the obstacle.


If it would be decided, against the negative opinion of Belgocontrol, to build obstacles, Belgocontrol cannot be held responsible for any possible consequences.


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