From the newsletter of Jean Tacquet A Survival Kit for Paris
Who can be a B&B host?
Anyone can be a host, provided that it is done at his/her primary residence and at least one independent and comfortable room is dedicated for this activity.How can one get endorsed by the Paris City Hall and benefit from the label Hôtes Qualité Paris?
You must contact one of the organizations approved by City Hall, and sign up with them. Then they will send a professional to visit and make sure your guest bedroom complies with the guidelines.
Can I be independent?
Yes, but you must be registered with City Hall under the latest version of the tourism ordinance, Articles 324-3, 4 and 5 of April 2006, which gives the legal definition of the B&B (called “chambres d'hôtes” in French) as: “Furnished bedrooms located inside a lodging dedicated to welcoming tourists who pay for one or more nights and the related services.” In French: "Chambres meublées situées chez l'habitant en vue d'accueillir des touristes, à titre onéreux, pour une ou plusieurs nuitées, assorties de prestations".
You can download the registration form here: "Formulaire de déclaration à la Mairie".
A copy of the relevant regulation may be found here: “Décret du 3 août 2007".
Can I be a B&B host if I am myself a renter?
Yes, you can, if the lease does not explicitly forbid it. In any case, it is highly advisable to inform the landlord, who in return will check the by-laws of the co-ownership to make sure that there is no provision against this activity. Of course, if you rent in a low-income housing project, in French (H.L.M.) then it is completely forbidden.