French Citizenship by Naturalization: Test the Route Before Counting Years

Five years of residence can satisfy the standard duration condition for French naturalization by decree, but it does not create automatic citizenship. The administration also examines lawful stay, the center of your family and professional life, French language, civic assimilation, professional integration, conduct, and a route-specific document file. Declaration routes—such as some family-based routes—have different conditions and should not be mixed with naturalization by decree.

First decide which procedure applies

Use the official becoming French route selector before assembling documents. The steps below apply to naturalization by decree for an adult living in France. Marriage, parent, sibling, ascendant, birth, or schooling routes require their own current guidance.

For decree naturalization, Service-Public's current page states a general five-year minimum residence period and lists exceptions, including some cases with a shorter period or no minimum. It also states that the applicant's material interests—particularly professional interests—and family ties must be centered in France when the decree is signed.

Build a chronology, not a pile of PDFs

Create a month-by-month record of addresses, residence status, work or study, tax filings, and significant absences. Attach the document that proves each transition. If a spouse or children live abroad, or if work and income are mainly outside France, explain the facts rather than assuming a residence card settles the center-of-life question.

The official checklist includes identity and residence documents, civil-status evidence, proof of domicile, resources and tax, language evidence, civic-exam evidence, and family documents where relevant. A foreign criminal-record document may also be required depending on residence history.

Language, civics, and professional integration are live requirements

Service-Public's page, verified July 16, 2026, requires sufficient French, successful completion of the civic examination, and a prefecture interview for assimilation. For naturalisation by decree, the official language-evidence page specifies at least B2 in spoken and written French. Check whether your diploma is accepted or you need a recognised language test; the listed TCF and TEF certificates must have been issued less than two years earlier. Check the specific exemption and accommodation rules before booking a test, and verify the accepted evidence again when filing.

Professional integration is not demonstrated by one isolated payslip. Show how contracts, employer certificates, payslips, tax notices, business records, or benefits explain your present resources and recent transitions.

Foreign documents need their own quality check

Civil-status records may need full copies, official French translations, and—depending on the issuing country—legalization or apostille. Reconcile names, accents, dates, and places across every record. Keep the original translation and be ready to present originals even if the application is submitted online.

Dual nationality and submission

France may allow a person to hold French nationality alongside another nationality, but retention of the existing nationality depends on the other country's law. Verify that issue with the other country's competent authority.

Submit through the procedure specified for your address, save the receipt, and answer requests for missing documents within the stated deadline. If the application is postponed, rejected, or closed without examination, read the reason and appeal instructions before deciding whether to challenge or rebuild the file.

To compare another naturalisation system without transferring French rules, consult the Greek citizenship requirements.

Correction — October 15, 2026: The language section now states the B2 spoken-and-written standard and the validity period for listed TCF/TEF certificates; the earlier wording said only “sufficient French.”