The extension of a German trademark or european union brand can be applied every 10 years for further 10 years.
Fees for the renewal of a German trademark:
The renewal fee of the DPMA costs 750 euros (up to 3 classes). For each additional class starting at 4th Class must be paid an extension fee of 260 euros.
Fees for the renewal of a European Union trademark (EU):
EUIPO's renewal fee costs €850 for one class, €50 for second class and €150 for each additional class.