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What are the rules for correct French email etiquette?
Written and electronic communication can sometimes differ
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Is it possible to receive a French pension and hold an S1?
This is a common situation for people who have worked both in France and in the UK
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What taxes are collected on a rented out second home in France?
Taxe d'habitation applies to all housing not used as a main residence
How long does planning permission last?
If you obtain planning permission to build a house, how long is it valid for? J.V.

Once you have obtained a permis de construire it is valid for three years from the date of being given formal permission (a law come in last year extending this from two). This also applies to the more informal déclaration préalable de travaux that is required for certain minor constructions, as well as certain other permissions like a permis à démolir (demolition permit), or permis d’aménager.
The duration may on request be extended twice by one year each time, however only if the rules applicable to your project have not changed in the meantime. In other cases the permission runs out after the three years.