Kernrechtsfrage
Whether a noise forecast had to be obtained before granting the building permit for the workshop project.
Extrahierter Entscheid
Yes. Because a possible exceedance of the planning values could not be excluded, the permitting authority had to obtain a noise forecast before deciding on the permit.
Extrahierte Begründung
For stationary installations, the permit may be granted only if the expected emissions are compatible with the planning values. The duty to investigate arises as soon as an exceedance cannot be ruled out; later control measurements cannot replace the required prior assessment. The river noise was irrelevant for assessing the project noise alone.