Short answer
You can live in your own property, but owning it does not automatically give you the right to reside in Portugal. To stay long-term you need a residence visa or permit (e.g. D7, D8, work or family route). Short stays are fine under normal tourist rules. Check your specific situation with the Portuguese consulate or AIMA before planning a permanent move.
General information, not legal or tax advice. Rules and amounts change: confirm with official sources.
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A renovated 5-bedroom house in Ribeira Grande, São Miguel island, minutes from the beach and local life.