Short Answer
Drilling holes into the exterior masonry or window frames of a building to install a balcony safety net requires explicit, written authorization from the property owner.
Altering the external facade constitutes a structural modification, meaning unauthorized drilling legally empowers your landlord to demand immediate removal and structural restoration at your expense.
What Most Expats Don't Realize
You drilled four small holes into the balcony brickwork to anchor a safety net for your cat, assuming minor cosmetic alterations to the exterior were completely acceptable. The property management company noticed the anchors during a routine courtyard inspection and issued a formal legal warning for unauthorized structural damage. Because you did not secure written consent before penetrating the building envelope, you were forced to pay a professional masonry contractor €750 to remove the installation, patch the holes, and paint the exterior wall to match the original building color.
What To Do
- Call a local pet supply specialist to purchase a tension-based, telescopic pole system that secures a cat net without any drilling.
- Ask your landlord in writing for facade modification permission if a clamp-based installation system is structurally impossible for your balcony layout.
- "Gibt es Vorgaben für das Anbringen eines Katzennetzes?" (Are there specifications for installing a cat net?) — send this inquiry to the building administration before purchasing any installation hardware.
The Truth
Germany’s strict property protection laws view the external aesthetic uniformity and structural shell of a building as a landlord asset. The system treats any unapproved physical penetration of the building's exterior as a direct breach of lease conditions, allowing owners to enforce structural restoration mandates regardless of your pet's safety requirements.