Yes and no. It depends on the building. Usually, a "normal" residential building does not require a lightning conductor, unless the respective state building code mandates it (although I do not know if this is the case in any state, in NRW to my knowledge it is not). If a building is located in a particularly exposed location or is particularly tall (I believe from 20 m), an external lightning protection system must be installed.
Regardless of that, it is another question whether this makes sense or whether the building insurance might require it or it is a matter of personal sense of security.
However, the internal lightning protection Type 1 and 2, which is now mandatory for new buildings, is certainly useful. Possibly also extended to Type 3 for sensitive devices. Because much more often than a direct lightning strike, an indirect lightning strike, which causes surges in the network, leads to damage to devices. So, if not already present, I would consider installing a combined arrester.