In my view
Legally, your interpretation is reasonable, this is not subletting.
However, because the clause forbids lending without permission, the landlord technically can object.
“The tenant must occupy the accommodation for themselves, their family and the persons for whom they are responsible. Consequently, they may not assign their rights under this lease, nor sublet, or even lend, all or part of the leased property, without the prior written consent of the lessor.”
This clause reflects article 8 of the Loi du 6 juillet 1989, which forbids subletting or lending the property without the landlord’s written consent
The legal distinction
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Subletting means receiving payment (even indirectly) from someone staying in your place — so your landlord is right that you cannot rent or “lend” the property commercially.
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However, a pet sitter through Trusted Housesitters is not a subtenant:
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They do not pay rent or receive any rights of occupancy.
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They are there on your behalf, to care for pets and maintain the home.
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It is comparable to having a friend to house-sit and not lending or subletting.
So, legally speaking, this is not a sublease (sous-location) and does not transfer tenancy rights.
The grey area
The potential problem lies in the phrase “nor even lend … all or part of the property.”
In strict legal terms, “lending” (prêter le logement) can mean allowing someone else to occupy the place even temporarily when you are absent, even without payment.
So, a very cautious landlord could interpret your 1–2 week absences with caring friend sitter as “lending.”
That said, the law’s intent is mainly to prevent unauthorised occupants or hidden subletting, not to forbid a brief stay by someone taking care of your pets in your home.
What you can do
To keep good relations and stay within your rights:
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Explain clearly that the sitter is not a guest or tenant, receives no rent, and is there on your behalf to ensure the property and animals are secure.
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Offer to share the sitter’s ID and insurance coverage (Trusted Housesitters provides both).
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Emphasize security: it’s safer to have someone in the home rather than leave it empty.
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Request written confirmation that they agree to this arrangement, or, if your landlord insist, that they confirm why they consider it “lending”
In practice
Most landlords will accept the above once you clarify that you engage with a temporary caretaker, not an occupant or guest, and that there’s no financial transaction.
I hope this helps. Good luck 