That’s not true.
What happens is that everything built on rustic land before 1956 is legal even if it is in a protected area (where the use of housing is not allowed) or the minimum plot to build is not met.
However, uses cannot be changed even if the volume is legal. A stable or storage room, even if built before 1956, is a stable or storage and cannot be transformed into a dwelling. If this is done without authorisation, the use is not permitted.

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