Better to declare it
Adding a new structure can increase the rental value of your home, which is used as the basis for calculating council tax on second homes and property tax, both local taxes. The same applies to swimming pools, which are also subject to development tax. Last year, using artificial intelligence and aerial photos, the tax authorities detected 140,000 undeclared swimming pools in France. As a result, it recovered an additional €40 million in property tax from owners who had to regularise their situation. The tax authorities have no intention of stopping there: they want to extend this method to other buildings, garden sheds and conservatories.
Translated with DeepL.com (free version)
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