Art. 42 of the Civil Aviation Act stipulates that the federal government can issue an ordinance prescribing that buildings and other obstacles may only be erected within a certain radius of public airports or flight control installations or within a certain distance from flight paths provided they do not impair aviation security (security zones).
All applications for the construction of buildings, installations, the planting of vegetation and reforestation which exceed the maximum heights specified in the plans and do not correspond to the descriptions in the plans must be submitted to Zurich Airport, Zone Protection.
The cantonal reporting office decides in collaboration with FOCA on whether and under what terms and conditions the obstacle can be built. This same applies to changes to existing obstacles.