Installations subject to licensing are checked within the required licensing procedure whether they use the best available noise abatement measures. Installations not subject to licensing are checked within a normal building procedure.

In case there are doubts about the environmental impacts of a building project during the processing of a building application, an expert opinion is to clarify the situation. This will finally be the cheapest solution for the potential emitter of excessive noise as remedial measures as a consequence of complaints and subsequent orders are often very costly and also accompanied by a loss of confidence from a sceptical neighbourhood.

The accumulation of noise complaints in the summertime shows that not only the open windows of the appellants lead to an intensified perception of noise. Most firms possess a heating system but many have no sufficient aeration possibilities or air-conditioning at the workplaces during the summer heat and as a consequence disturbing industrial noise propagates through open windows, doors and gates.