All communes must have their own rules then, our number is, quite sensibly, fixed to the boite a lettres which is at least 50 metres round a corner to the entrance and even further from the house.
Or maybe your house has had a number for a long time. The criteria talked about above is quite new & relates to the recent ish change from names only to having numbers for everything.
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No, we never even had a name for the lane, it was merely a chemin rural before, and before we completed even stopped where our post box is now, overgrown for the rest of its length. We were always an LD until recently and nobody else in the village had a number either.
I’m not complaining, before numbering of course the posties knew who we were but the likes of DHL etc. would simply go back and say ‘no-one home’.
In our commune, until quite recently no houses had numbers or “names”… each letterbox was supposed to bear the name of the “letterbox owner” but, of course, many boxes were left blank. Our Postperson would know where people lived and, if they didn’t, they would ask at the Mairie, or at a neighbouring property…
Many roads had “local names” eg Jackie’s Road… as our friend Jackie lived there and is now dead but still remembered by his friends. Now his road has an official name, but who cares, it will be Jackie’s Rd while we draw breath 
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