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Four years ago I dismounted the roof of an annex (this roof was threatening to collapse) without asking anyone. The annex in question is on the cadastre. Today I want to remake the roof in part to make an open carport with a floor area of ​​30m ². the town hall asks me for a building permit, I find it a bit strange since I am only renovating the old one. What do you think?

Only restoration work, after a disaster, for example, is exempt from planning permission. In your case, it is a reconstruction that, although identical, actually passes through a building permit (especially since it is you who have dismantled your roof... without a demolition permit.

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