Becoming Luxembourgish by naturalisation comes down to a list you can hold in one hand. The guichet.public.lu naturalisation page opens with "Naturalisation is open to all adults, provided that:". Put that sentence together with the refusal rules further down the same page, and you get five conditions: adulthood, five years of legal residence, a Luxembourgish language certificate, a civics course, and nothing serious on your criminal record.
If you have lived here a while, you may already hold two of the five without having done anything special. This page walks through each condition with its primary source, so you know exactly what you have, what you lack, and which gap takes the longest to close.
Naturalisation asks for five things: be an adult, five years of legal residence with the final year uninterrupted, a Sproochentest pass certificate, the "Vivre ensemble" course or its test, and no disqualifying criminal record.
The five conditions at a glance
| Condition | What satisfies it |
|---|---|
| Adulthood | Naturalisation is open to adults |
| Residence | At least 5 years of legal residence in Luxembourg; the final year before the application uninterrupted |
| Language | A Luxembourgish language test pass certificate: the Sproochentest, speaking at A2 and listening at B1 |
| Civics | The "Vivre ensemble au Grand-Duché de Luxembourg" course, 24 hours, or the test covering its topics |
| Record | No refusal ground: refusal follows false statements, concealed important information or fraud in the procedure, or a criminal sentence, a custodial sentence of 12 months or more, or a suspended sentence of 24 months or more |
Everything in that table comes from the guichet naturalisation page. On the record condition, one more line from the same page matters for foreign convictions: the underlying facts must also be a criminal offence under Luxembourg law, and, if applicable and except in case of rehabilitation, the sentence must have been definitively served less than 15 years before the application.
Residence: five years, and one year that counts double
The residence condition has a shape people miss: at least 5 years of legal residence, with the final year immediately before the application uninterrupted. Notice that the condition singles out one year: the twelve months right before you file are the ones it explicitly requires to be continuous.
Practically, this is the condition you cannot speed up. The other four can all be worked on while the residence clock runs, which is why the order you tackle them in matters more than people think. More on that at the end.
The language requirement in detail
The certificate on the list comes from one exam: the Sproochentest, run by the Institut national des langues Luxembourg (INLL). Its shape, from the INLL's exam page:
- Speaking: 10 minutes, in two parts of 5. An interview with an examiner first, then you describe a visual you choose from three offered. Judged at level A2.
- Listening: 35 minutes, three recordings with multiple-choice answers. Judged at level B1.
- No reading test, no writing test.
You pass with at least 50 percent on the speaking, or, if speaking falls short, with a speaking-and-listening average of at least 50 percent. Registration costs 75 euros per attempt, there is no limit on attempts per the INLL FAQ, and the certificate "is valid for an unlimited period of time". That last line is worth reading twice: you can pass the exam in year two of your five and the certificate still counts in year five.
A2 is the level of simple everyday conversation, not fluency. The full exam anatomy is in what is the Sproochentest, and the language requirement in detail covers levels, exemptions and common myths.
The civics requirement: "Vivre ensemble"
The second certificate in your file is civic, not linguistic. Per guichet.public.lu, you either take the "Vivre ensemble au Grand-Duché de Luxembourg" course, 24 hours in three modules: 6 hours on fundamental rights, 12 on state and communal institutions, 6 on history and European integration, or you pass the test covering the topics taught in that course.
The test alternative is concrete, per men.public.lu: a computer-based multiple-choice exam organised at Esch-Belval. Either way, the certificate is issued by the Service de la formation des adultes (SFA), and you present it with your application.
Course or test is a real choice. Twenty-four hours of classes suits people who want the material walked through; the exam suits people who would rather study alone and clear the condition in one sitting.
Who can skip the language exam
Two narrow routes, both on guichet.public.lu, replace or waive the Sproochentest.
The 20-year route: an adult resident in Luxembourg for at least 20 years, uninterrupted over the last 12 months and acquiring nationality by option, takes a 24-hour introductory Luxembourgish course instead of the full exam. The course runs through the SFA and its approved organising institutions, and the attendance certificate is sent back to the SFA afterwards.
The medical route: an applicant whose physical or mental state prevents learning Luxembourgish can be exempted, on a specialist doctor's certificate, the exemption granted by the Minister of Justice.
If you are not in either group, the exam stands, and it is the most trainable item on the list.
The order to do things in
Look at the list as a schedule rather than a checklist and it sorts itself.
The residence years pass on their own; your only job is keeping the final year uninterrupted. The civics course is a fixed 24 hours, or one test, whenever you choose to book it. The language is the one condition that rewards starting early, for two reasons in the sources. The certificate never expires, so an early pass is never wasted. And exam seats are scarce: as of 11 August 2026, not one published 2026 session on the INLL's MyINL portal was still bookable, the remaining December dates being sold out or closed for registration, with registration for the January 2027 sessions opening on 1 September 2026 at 10:00.
So the sequence that wastes nothing: let the residence clock run, book the civics course when convenient, and give the language ten minutes a day starting now. If you want to know today where your speaking stands against A2, a free mock exam answers that this week, and do you need Luxembourgish in Luxembourg settles where the requirement does and does not reach.