As in Britain, it is a legal requirement in Portugal for the address on the licence to reflect
the correct address of its holder.
If lost, stolen or damaged, the licence can only be renewed or replaced by the original issuing authority. Some licensing authorities, such as the DVLA, will not renew or replace a licence to an overseas address.
When the licence eventually expires, the Portuguese authority will not renew it unless the holder takes (and passes) a driving test in Portugal.
In order to
exchange your driver's licence, you should apply to the nearest office of the Direçcão-Geral de Viação (Portuguese Driver and Vehicle Licensing Authority). You will be required to surrender your original licence in exchange for a locally issued one.