Key takeaways: contrary to popular belief, rents are already capped in Luxembourg: 5% of the invested capital, one adjustment every 2 years, increases limited to 10%. No bill lowering this cap has been tabled to date. What is actually moving forward is the rent register (cadastre des loyers), a transparency tool inspired by the German Mietspiegel, announced for the end of the legislature (autumn 2028). The survey sent to multi-property owners in late 2025 was voluntary: nothing obliged you to answer it.
Rents are already capped: the three rules in force
Public debate sometimes suggests that rent control has yet to be invented. In reality, the amended law of 21 September 2006 on residential leases, reinforced by the reform of 23 July 2024, already caps rents on three levels:
| Rule | What the law says |
|---|---|
| Absolute cap | Annual rent may not exceed 5% of the capital invested in the home, revalued and discounted for age (art. 3) |
| Frequency | One rent adjustment at most every 2 years |
| Size | Increases capped at 10%; beyond that, the tenant can object by registered letter and the excess is not due |
Since the 2024 reform, the "luxury housing" exception has disappeared: these rules apply to all homes. For the practical calculation of invested capital and your increase margin, see also this CARMO blog article: how much can you raise the rent in Luxembourg.
The debate on tighter rent control: where do things really stand?
The true history deserves to be set straight, because many false ideas circulate:
- 2022: the previous government proposed, through amendments to the lease reform bill, lowering the cap from 5% to 3.5% of invested capital (3% for energy-inefficient homes). Those amendments were abandoned.
- July 2024: the law finally voted keeps the cap at 5%. The same day, Parliament adopted a motion asking the government to table a rent-cap reform before 30 June 2025.
- 2025-2026: the motion's deadline expired with no bill tabled. The Housing Minister favours market transparency and targeted adjustments, making any cap reform conditional on the sector exiting its crisis. The opposition demands a "Mietdeckel"; the April 2026 parliamentary debate produced no timetable.
Status as of 20 July 2026: no bill lowering the cap has been tabled. The applicable rules remain those in the table above. An official study published in April 2026 does, however, propose limiting rent variations to ±7% per year: a suggestion, not a law.
The rent register: a Luxembourg-style Mietspiegel
While the cap is debated, a concrete project is advancing: the rent register. Led by LISER within the Housing Observatory, on behalf of the Ministry of Housing, it aims to document actual rents, neighbourhood by neighbourhood and housing type by housing type, on the model of the German Mietspiegel.
The milestones: a concept report in January 2025, a large survey of around 30,000 multi-property owners in October-November 2025 (20.8% response rate, covering 12,545 homes), three studies published in April 2026, and a stated political goal: a genuine rent register published by the end of the legislature, in autumn 2028. Worth noting: the tool is officially presented as useful independently of any rent-cap regulation. Transparency first; using it one day as the basis for tighter control remains a political decision that has not been taken.
Do you have to answer the rent survey?
This is the legal point almost nobody explains. Article 28 of the 2006 law authorises each municipality to request annually from landlords and tenants on its territory information on rents, charges and floor areas, on pain of a fine set by municipal regulation. The minister can only obtain from municipalities the results already collected: the law gives him no power to collect directly from owners.
Consequence: the national survey sent to multi-property owners in late 2025 was based on voluntary participation. The Observatory's official report states it in black and white: there was no obligation to answer this survey. On the other hand, a form sent by your municipality under Article 28 is mandatory, and failure to answer can be fined. So always check who is asking: municipality or ministry, the rules are not the same.
Actual rents today: the official figures
According to the Housing Observatory (advertised rents for new leases, April 2025 to March 2026), the average apartment rent stands at around €1,795 per month nationally (€42.53/m²). In Esch-sur-Alzette, it is around €1,102 per month, with an advertised price of €44.28/m² reflecting smaller floor areas. The south therefore remains far more affordable in monthly rent than the national average, an argument investors in the region know well: see also this CARMO blog article: short-term or long-term rental, the right investment maths.
What it changes for you
If you are a landlord
The direction is clear: more transparency, increasingly documented rents, and a cap calculated on invested capital. Your best protection is a solid file: keep deeds, renovation invoices and investment receipts, because in a dispute before the rent commission, it is the landlord who must document the invested capital. And keep the legal rhythm: one adjustment every two years, properly notified.
If you invest
A tighter cap would mechanically compress rental yields on properties bought at high prices. Properties in the southern region, with their lower entry ticket, offer a bigger safety margin against this regulatory risk. Factor the "±7% control" scenario into your yield calculations before buying, and favour rents already consistent with the market: social rental management can also fully secure the income, see this CARMO blog article: social rental management, guaranteed rent and a 90% exemption.
Frequently asked questions
Are rents capped in Luxembourg?
Yes, and they have been for a long time: annual rent may not exceed 5% of the revalued invested capital, with at most one adjustment every 2 years and increases capped at 10% per adjustment.
Will the cap drop from 5% to 3.5%?
No bill to that effect has been tabled to date. The 3.5% figure comes from 2022 amendments, abandoned in the reform voted in 2024, which kept 5%. A 2026 official study separately proposes limiting variations to ±7% per year, with no legislative follow-up at this stage.
Do I have to answer the rent survey?
Not if it comes from the ministry or LISER: the 2025 national survey was voluntary. However, a form sent by your municipality under Article 28 of the 2006 law is mandatory, on pain of a municipal fine.
What is the rent register?
A public database of actual rents, by neighbourhood and housing type, inspired by the German Mietspiegel, built by LISER and the Housing Observatory to bring objectivity to the rental market.
When will the rent register be published?
The Housing Minister has announced publication by the end of the legislature, i.e. autumn 2028, relying in particular on the future national register of buildings and dwellings.
What to remember: no new cap is in force or tabled, but the direction is clear: rent transparency is coming. The winning landlord of 2028 is the one who, from 2026, documents the invested capital, charges defensible rents and respects the legal adjustment rhythm. That is exactly the kind of audit we run with landlords.
Request my free valuationRead: raising the rent, the guide
Sources and legal basis
- Amended law of 21 September 2006 on residential leases, consolidated version of 1 August 2024 (Legilux), art. 3 and 28
- Law of 23 July 2024 amending the lease law (Legilux)
- Gouvernement.lu: publication of the lease studies (17 April 2026)
- Housing Observatory, analysis report No 23: rent register survey (April 2026); reports No 14, 21 and 22
- Housing Observatory: advertised rents by municipality (April 2025 - March 2026)
- Chamber of Deputies: debate "When will the lease reform come?" (April 2026)
By David Carmo, founder of CARMO Immobilier, has been a real estate professional since 2008. A former member of the board of directors and disciplinary council of the Chambre Immobilière du Grand-Duché de Luxembourg, he is today a founding member and board member of the Fédération des Agents Immobiliers (FAI) and a trainer at the Académie de l'Immobilier.
This article is for information purposes and does not constitute legal advice. The legislative situation may change: check the legislation in force before any decision.