Questão jurídica principal
Whether the polytunnels and rainwater biotope are subject to a building permit under Art. 22 RPG.
Decisão extraída
The biotope is clearly permit-required; the polytunnels are also permit-required because they were used for a longer period and were intended for year-round use.
Fundamentação extraída
The court applied the federal concept of structures and facilities with significant spatial effect. Temporary farm installations may be exempt only for short periods; here the tunnels were not merely short-term devices.