Short answer
A technical survey is not mandatory in Portugal, but it is strongly recommended, especially for older or rural properties. You should hire a qualified engineer or architect to inspect the structure, roof, damp, electrical and plumbing systems, and to check for illegal works. The report helps you negotiate or withdraw. Costs vary; get quotes locally and confirm the professional's credentials.
General information, not legal or tax advice. Rules and amounts change: confirm with official sources.
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