Legal requirements guide
Before you commit to renting, subletting, or swapping, check whether your lease, landlord, student residence, or local housing rules allow another student to stay in your room or apartment.
Co-Erasmus helps students organize peer-to-peer housing, but it does not replace your lease, landlord approval, university housing rules, or legal advice.
Whole-place swap
Landlord permission is required before another student stays in your room or apartment, even if it is only for a limited period.
Room swap
If you only share part of your home, you can ask your landlord for permission. The landlord can only refuse if there is a serious reason, such as overcrowding, safety concerns, or the arrangement being unreasonable.
Legal basis
BGB §540 and BGB §553.