Grounding for advising on the pièces justificatives a démarche requires. This is about acceptability rules, not reading a scan (see ../documents/). Which exact pièces a given démarche needs comes from its official checklist — do not invent a requirement; here you explain the rules for the documents commonly requested.

Discipline: state a rule only if you're sure; for an amount or a list that may have changed, say it depends and point the user to the official page rather than asserting a stale figure. The official portal is service-public.gouv.fr (the old service-public.fr now redirects there).

Justificatif de domicile (proof of address)

Recency depends on the démarche — there is NO universal "3 months" rule. Verified windows: CNI & passeport → less than 1 year; carte grise / immatriculation → less than 6 months; inscription sur les listes électorales → less than 3 months. Use the window the specific procedure states; never default to 3 months.
Accepted proofs (CNI/passeport fiche): facture d'électricité, gaz, eau; facture de téléphone — y compris mobile; avis d'imposition or certificat de non-imposition; attestation/facture d'assurance habitation; quittance de loyer issued by an agency or organisme social (a handwritten quittance from a private landlord is not enough on its own); titre de propriété; relevé CAF mentioning the aides au logement.
A mobile-phone bill is accepted — the old "fixed line / box only" restriction is obsolete.
Hébergé chez un tiers (living at someone else's address): three documents together — an attestation d'hébergement sur l'honneur signed by the host, the host's ID, and a justificatif de domicile in the host's name recent in the window the démarche requires (e.g. < 1 year for a passport/CNI). A person living with parents or a friend uses this.
- In the attestation the host states, on their honour, that they host the named person at their address free of charge (à titre gratuit). It may be temporary (à titre temporaire) — there is NO minimum-duration rule; do NOT claim the host must have hosted them "> 3 months".
- It carries: host's NOM/Prénom + address (+ phone), the hosted person's NOM/Prénom, the statement of hosting, and Fait à … le … with the host's signature. (Sample wording: "Je soussigné, , demeurant au , atteste sur l'honneur héberger à titre gratuit à mon domicile Monsieur/Madame , à titre temporaire …".)
Logé à l'hôtel (hotel accommodation): an attestation/certificate from the hotel plus the invoice (facture) for the last month.
A taxe d'habitation or avis d'imposition in the applicant's name also serves as proof of address.

Contrat d'engagement au respect des principes de la République (CERP)

Mandatory for EVERY titre de séjour request — first issue AND renewal (since the Jan 2024 immigration law, art. L412-7 CESEDA). The applicant signs a one-page Ministère de l'Intérieur form committing to 7 republican principles (liberté personnelle; expression et conscience; égalité femmes-hommes; dignité humaine; devise et symboles; intégrité territoriale; laïcité).
Refusing to sign ⇒ the préfet refuses the titre; a later serious breach can have it withdrawn. Signed with place/date, NOM PRÉNOM, NUMÉRO ÉTRANGER, signature.
Blank form to download (share the link when the user needs it): https://www.immigration.interieur.gouv.fr/limmigration-en-france/l-administration-numerique-pour-les-etrangers-en-France/le-contrat-d-engagement-a-respecter-les-principes-de-la-republique

Pièce d'identité

French nationals: CNI or passeport, valid — or sometimes expired by less than a set period for a renewal (only if the procedure allows it).
Foreign nationals: valid titre de séjour + passport. (Which number is which — visa N° vs passport MRZ vs titre N° — see ../documents/documents-administratifs.md.)
Bring originals to an in-person RDV; online démarches take a scan/photo of the original.

Photo d'identité

Must be a photo d'identité agréée (norm ISO/IEC 19794-5): recent (< 6 months), 35 × 45 mm, plain light background (not white), head bare and centred, neutral expression, mouth closed, eyes open. Taken by a photographe habilité or a cabine agréée — selfies and home prints are rejected.
The ePhoto / e-photo code (an agréé booth/photographer issues a digital code entered online) is the norm for the permis de conduire flow; for CNI/passeport the standard route is a compliant physical photo from a photographe habilité or cabine agréée. Either way it must be agréée.
Don't just say "find an agréé booth" — help locate one. If the person's city or postal code is already known, a locator link with it pre-filled helps, e.g. https://www.photomaton.com/fr-fr/trouver-un-photomaton/s?q=<address, URL-encoded>. Photomaton is one of several agréé chains, not the only one — offer it as a convenient starting point, not the exclusive option.

Timbre fiscal (électronique) — amounts as of 2026

Bought online at timbres.impots.gouv.fr (PDF/QR or a 16-digit SMS reference) or at a bureau de tabac agréé; valid 1 year, refundable within 18 months. The amount depends on the document and the applicant's age — confirm the current amount on that page.
Passeport (métropole): adult 86 €, minor 15–17 42 €, minor < 15 17 € (higher from abroad; reduced in Guyane/Mayotte).
CNI: free when you present the old card; 25 € when renewing a lost or stolen card (12,50 € en Guyane; exemption possible for précarité).

RIB / IBAN

Required whenever the démarche pays or reimburses the user: CAF (APL), France Travail, l'Assurance retraite, remboursements Ameli. A French IBAN starts with FR; the account must be in the applicant's name.

État civil — acte de naissance

Three forms: copie intégrale (full act + filiation + mentions marginales), extrait avec filiation, extrait sans filiation. First passport/CNI, mariage and nationalité usually need the copie intégrale or an extrait avec filiation, and it must be recent (< 3 months) when used as an identity/état-civil proof.
Where: free from the mairie of the place of birth or online via service-public.gouv.fr — never a paid intermediary. Born abroad (French citizen) → the Service central d'état civil (SCEC) de Nantes (MEAE), via the service-public.gouv.fr téléservice.
Many communes are dématérialisées (COMEDEC): the mairie fetches the acte directly, so the user does not need to provide it for a passport/CNI. Check before asking for it.
Foreign-language civil-status documents need a traduction par un traducteur assermenté, sometimes with apostille/légalisation.

General

A recency window ("< 6 mois", "< 1 an") is counted from the date of the application or RDV, not from when the document was downloaded.
Expect to show originals at an in-person appointment even when a scan was uploaded.
Never tell a person a free service costs money, and never send them to a paid look-alike to obtain an acte d'état civil or a timbre.

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