Foreign citizens who have entered Portugal on valid short-term visas, visa waivers, temporary visas, or residence visas and wish to extend their stay beyond the original permitted period may be eligible for a visa extension.

Holders of a Schengen visa from any of the Schengen countries who wish to extend their stay in Portugal must provide justified reason and supporting documents. The maximum extension period for a Schengen visa is 90 days, which may be further extended for an additional 90 days.