The essentials. In Luxembourg, rent can only be adjusted once every 2 years and must respect two ceilings at once: an annual rent capped at 5% of the invested capital, and a maximum increase of 10% per adjustment. The basis is the capital invested by the landlord, not the market price, and the burden of proof lies with the owner. A reform under preparation could lower this ceiling from 5% to 3.5% for new leases as early as 2026, so planning ahead genuinely matters.
Who sets the rules on rent in Luxembourg?
The governing text is the amended law of 21 September 2006 on residential leases, substantially revised by the law of 23 July 2024, in force since 1 August 2024. Keep the guiding principle in mind: in Luxembourg, rent is capped against the capital invested by the landlord, not against market prices. Many articles still online date from before the 2024 reform and carry outdated information, for example about so-called luxury dwellings. Be cautious with what you read elsewhere.
The two ceilings you must respect
Ceiling 1: 5% of the invested capital
The maximum annual rent cannot exceed 5% of the capital invested in the dwelling. In practice, the maximum monthly rent is: invested capital multiplied by 5%, then divided by 12.
Invested capital covers the purchase price (land included), deed costs, and lasting improvement works (conversion, extension, fitted kitchen). It excludes routine maintenance and decoration. This amount is revalued every 2 years using a coefficient published by STATEC (1.52 in 2025, 1.48 in 2026). Beyond 15 years of age, a 2% discount applies per additional 2-year period, unless the landlord has invested equivalent amounts in upkeep or repair. Crucial point: the burden of proving the invested capital lies with the landlord. Keep the notarial deed, invoices and quotes.
Ceiling 2: 10% maximum per adjustment
Since 1 August 2024, the former "annual thirds rule" has been replaced by a biennial limit of 10%: at each adjustment, rent cannot rise by more than 10%. If a landlord exceeds this and the tenant disagrees, the tenant objects by registered letter. The portion of the increase above 10% then does not apply, from the first term following the objection, and any surplus already paid must be refunded.
Once every 2 years, not sooner
Rent can only be adjusted once every 24 months at the earliest. It is an option, not an obligation: you may wait 3 or 4 years. On the administrative side, raising the rent requires neither a new lease nor an amendment. Conversely, demanding a new contract at every increase is regarded as an abusive practice by the Ministry of Housing.
A worked example in the south
Take an apartment in the southern basin (Pétange, Esch, Differdange) whose revalued invested capital is 500,000 EUR. The maximum legal annual rent is 25,000 EUR (5% of 500,000 EUR), i.e. around 2,083 EUR per month.
On the market side, advertised rents in the Esch canton were around 25.37 EUR/m² per month in June 2025 (up nearly 10% year on year, source: Observatoire de l'Habitat). For a 70 m² apartment, that is roughly 1,776 EUR per month.
The CARMO insight. In the south, market rent (here about 1,776 EUR) is often below the 5% legal ceiling (about 2,083 EUR). For a sitting tenant, the binding limits are therefore mainly the 2-year delay and the 10% cap, not the invested-capital ceiling. In Luxembourg City, where advertised rents exceed 37 EUR/m², the 5% ceiling is reached far sooner. And with the reform to 3.5% (see below), our example would drop to about 1,458 EUR per month for a new lease, at which point the ceiling would bite even in the south.
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France and Luxembourg: two opposing logics
For a cross-border landlord, the French reflex is misleading. The two systems do not rest on the same basis.
| Criterion | France | Luxembourg |
|---|---|---|
| Basis of the cap | Reference rent per m² in tight zones; in-lease revision via the IRL index | 5% of the capital invested by the landlord |
| Revision frequency | Annual where a revision clause applies | Every 2 years, 10% maximum per adjustment |
| Indexation | Allowed via the IRL | Indexation clauses forbidden (valid until the tenant objects) |
| "Luxury dwelling" | Not applicable | Concept abolished since 1 August 2024 |
What changed for landlords on 1 August 2024
The 2024 reform changed several rules that directly concern owners:
- End of "luxury dwellings": the concept that allowed the cap to be bypassed is abolished. The legal ceiling now applies to these properties, even where an old lease says otherwise.
- Agency fees split 50/50 between landlord and tenant, regardless of who instructed the agency. Any clause to the contrary is void.
- Rental deposit capped at 2 months of rent (down from 3), with a regulated return procedure and a penalty for late return.
- Written lease mandatory, with minimum mentions (parties, rent excluding charges, charge advances, deposit, and so on).
- Co-living regulated: a single lease, a co-living pact and joint liability between co-tenants.
What is coming: a 3.5% ceiling?
In 2024, the government committed to submitting a new reform of the rent ceiling. Bill 8184 plans to lower the cap from 5% to 3.5% of the invested capital for new leases, with entry into force envisaged during 2026. Existing leases would not be affected retroactively. At this stage the text is in parliamentary discussion: neither the rate nor the timetable is final. The Observatoire de l'Habitat has also published several studies on rent regulation in 2026. If you are planning to re-let or to set a new rent, doing so under the current regime may therefore carry real weight.
The rent commission and your remedies
The rent commission deals only with disputes over setting the rent and charge advances (it is not competent to verify a charges statement). It is a conciliation body. Before referring a case to it, an attempt at an amicable settlement is mandatory: the claiming party notifies the other in writing (registered letter advised), and only if no agreement is reached within one month can a request be sent to the commune's college of mayor and aldermen. Note: any request is inadmissible during the first 6 months of the lease. A solid invested-capital file remains your best protection.
If you are a landlord, if you are a tenant
If you are a landlord: document the invested capital from the moment of purchase, respect the 2-year delay and the 10% limit, notify the increase in writing with the reason, and keep all the evidence. Entrusting property management to a professional secures the calculation, the notification and, where needed, the conciliation. On the tax side, your landlord situation is shifting too: see our guide to the property tax and IMOB reform.
If you are a tenant: you can ask in writing for the reason for an increase, challenge a non-compliant rise by registered letter, and refer the matter to the rent commission after the amicable attempt. The portion of the increase above 10% is not due once the objection has been sent.
Bottom line. A compliant rent increase rests on three points: the right timing, the right ceiling, and a provable invested-capital file. With the ceiling reform on the horizon, setting a fair and defensible rent today protects your yield for years to come.
FAQ: raising the rent in Luxembourg
How much can you raise a rent in Luxembourg?
By 10% maximum at each adjustment, within the limit of an annual rent equal to 5% of the invested capital. Both ceilings apply at the same time, and an adjustment is only possible once every 2 years.
How often can the rent be increased?
Once every 2 years at the earliest (24 months between two adjustments). It is an option for the landlord, not an obligation: they may wait longer.
How is the 5% ceiling calculated?
Maximum annual rent = 5% of the revalued invested capital; maximum monthly rent = that amount divided by 12. The basis is the capital actually invested (price, deed costs, lasting works), not the market price. The burden of proof lies with the landlord.
Do luxury dwellings still escape the ceiling?
No. That concept has been abolished since 1 August 2024. The legal rent ceiling now applies to all dwellings, including those once labelled as luxury dwellings.
Can the tenant refuse an increase?
Yes, if they consider it non-compliant. They must flag it by registered letter, then, failing agreement, refer the matter to the rent commission after an amicable attempt. The portion of the rise above 10% does not apply from the objection onward.
Will the cap really drop from 5% to 3.5%?
A bill (8184) plans this for new leases, with possible entry into force in 2026. It has not been voted to date and existing leases would not be affected retroactively. The rate and the timetable remain to be confirmed.
Official sources
- Residential lease FAQ, Logement.lu (Ministry of Housing): logement.public.lu
- Revision of rental legislation (press release of 10 July 2024), gouvernement.lu: gouvernement.lu
- Calculating the legal rent ceiling and invested capital (brochure), Logement.lu: logement.public.lu
- Rental prices, Observatoire de l'Habitat: logement.public.lu
By David Carmo, founder of CARMO Immobilier. Real estate professional since 2008, member of the board of the Real Estate Chamber of the Grand Duchy of Luxembourg, of the disciplinary council, and trainer at the Académie de l'Immobilier.
This article is for information only and does not constitute legal advice. Regulations evolve and every situation is specific. Before any decision, check the texts in force and consult your notary or an adviser.