Tipping for furniture delivery is not a common practice everywhere, and it can vary based on the cultural norms and customs of the region you are in. In some countries, such as the United States, tipping delivery personnel is more common and often expected. However, in other places, like many European countries, including Germany, tipping for furniture delivery may not be as customary or expected.
In Germany, for instance, tipping for delivery services is generally not required or expected. The delivery fee is usually included in the overall cost of the furniture, and the delivery personnel are already paid for their services.
That said, if you feel that the delivery service was exceptional, and you want to show appreciation, you can certainly offer a small tip as a gesture of gratitude. However, it's important to remember that it's not obligatory, and the delivery personnel should not expect it.
If you decide to tip, you can give a modest amount, such as a few euros. Alternatively, you can also offer refreshments like bottled water or a cold drink, which can be a nice way to show your appreciation without directly giving cash.
Ultimately, the decision to tip or not is entirely up to you, and it should be based on your personal judgment and the level of service you received.