Do I need planning permission?
If you live in an urban area with a local planning scheme (PLU), you don't need planning permission if your conservatory is less than 5 m² (for an entrance hatch, for example). If your conservatory is larger than 5 m², you will need to submit a preliminary works declaration (déclaration préalable de travaux - DP), provided that its footprint and floor area are less than 40 m². If the footprint or floor area of your conservatory exceeds 40 m², you will need planning permission.
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