Since the 7th of July 2016 there has been new planning permission legislation in France, as part of the art, culture, heritage and architecture law no. 2016-925, the “loi LCAP”.
Article 82 of this law states that all building projects in France of 150m2 and over will require an architect to draw up and submit the ‘demande de permis de construire’ (planning application). The previous law set this threshold at 170m2 and this is still current until the new law comes into practice on 1st March 2017.
So if you are planning a building or renovation project in France, note that if the total floor area on all floors is 150m2 or over (excluding garages, stairwells, areas under 1.8 metres ceiling height and unconverted attics and cellars), you will need to employ an architect to design and sign off your planning permission application. If you would prefer to prepare and submit the planning application yourself, you will need to keep the floor area under 150m2.