Renting Guide

Rent increases in Luxembourg: the limits, and how to check one

A letter arrives proposing a higher rent. Before you accept it or resist it, there are two separate ceilings to test it against, and a free route to a communal body if the arithmetic does not work.

Rent here is not indexed automatically

Luxembourg salaries are indexed to the cost of living; residential rents are not. A landlord cannot apply an automatic annual uplift because inflation rose. Rent can be revised, but a revision is a discrete act that has to respect both a procedure and two substantive limits.

The procedure is straightforward and worth insisting on: a revision has to be notified by registered letter with one month's notice. A rent increase announced by email, by text message or verbally at the door is not a properly notified revision, and you are entitled to ask for it in the correct form before engaging with the substance.

The first ceiling: 5% of invested capital

The structural cap on Luxembourg residential rent is the rule that the annual rent may not exceed 5% of the capital invested in the dwelling, revalued. The 2024 reform kept this rule and made two clarifications that matter.

First, it abolished the concept of the luxury dwelling, which had previously allowed higher-end properties to sit outside the cap entirely. That change removed an exemption that was regularly invoked on exactly the kind of property a relocating executive rents.

Second, the cap now applies to the sum of the rents where a dwelling is let to several tenants, whether as a colocation under a single joint lease or under multiple individual leases. Letting an apartment room by room no longer escapes the ceiling by fragmenting it.

Where the property is let furnished, a landlord may charge a legitimate rent supplement for the furniture on top of the capped amount. If a proposed increase is attributed to furniture, ask what furniture, because the supplement should correspond to something on the inventory.

The second ceiling: 10% at each adaptation

The reform replaced the previous mechanism of annual thirds with a biennial limit of 10%. At each adaptation of the rent, the increase may not exceed 10%.

For planning purposes this changes the shape of the risk rather than removing it. A tenant signing at €2,400 should not model a small annual creep; they should model a possible step every two years, capped at 10%, which on that rent is up to €240 a month. Over a five-year tenancy that is a materially different picture from a 2% annual assumption, and it is worth putting into a household budget at the point of signature rather than at the point of the letter.

Both ceilings apply together. An increase can respect the 10% limit and still be unlawful because the resulting rent exceeds the 5%-of-capital figure. Testing only the more visible of the two is the most common error tenants make.

How to respond to a proposed increase

Answer in writing, and answer with questions rather than with a position.

• Confirm the date of the last adaptation, to establish whether the biennial interval has actually elapsed.
• Ask for the basis of the calculation against the invested-capital rule.
• Where the property is furnished, ask what part of the increase is attributed to the furniture supplement.
• Ask whether the increase relates to rent or to the charges advance, because the two are governed completely differently. A rise in the monthly charges advance is not a rent increase at all; it is an adjustment of an estimate, and it should be justified by the reconciled accounts approved by the general assembly.

That last distinction resolves a large share of the disputes we see. Tenants receive a higher monthly figure and read it as a rent increase when it is a charges adjustment, or the reverse. Ask which it is before you argue about whether it is permitted.

Where to go if the numbers do not work

Every commune has a commission des loyers, a rent commission with jurisdiction over the dwellings in that commune. It can be petitioned free of charge on an excessive rent, on contested charges, on a guarantee that has not been returned and on a disputed inventory.

Its opinion is not binding, but it is frequently followed by the courts, and the reform made the existence of this route a mandatory mention in the lease itself. If the opinion is not respected, the matter can go to the justice of the peace and, for higher rents, to the district court.

Two practical notes. Petitioning the commission is not an act of hostility and it does not, by itself, put your tenancy at risk: a landlord cannot terminate an open-ended residential lease without one of a limited set of legitimate grounds, reasoned in writing. And the commission works from documents, so the strength of your position depends on the lease, the notification letter and the charges statements rather than on the account you give of the conversation.

Three questions we are asked

Can I simply refuse an increase? You can dispute it, and the route is the rent commission. Refusing to engage while continuing to pay the old amount leaves the position unresolved, which is the worst of the available outcomes. Respond in writing, ask for the basis, and escalate if the answer does not hold.

Does a renewal reset my lease? Not necessarily, and this is worth checking. Where a fixed-term lease reaches its end without being terminated, it converts automatically into an open-ended contract, which is generally favourable to the tenant: you may then terminate at any time with three months' notice, without waiting for an anniversary date. Signing a fresh fixed-term contract instead can hand that flexibility back.

My landlord wants to increase the rent because they renovated. Is that allowed? Renovation increases the capital invested in the dwelling, so it can legitimately change the figure the 5% rule is applied to. It does not suspend the 10% limit at each adaptation, nor the requirement to notify by registered letter with a month's notice.

Preparing for the conversation before the letter arrives

The strongest position in a renewal discussion is held by the tenant who has the documents in order before the subject comes up, and it costs an hour a year to maintain.

Keep four things in one folder: the signed lease, the entry inventory with its photographs, every charges reconciliation you have received, and the record of every rent payment. Between them they establish the date of the last adaptation, the base rent excluding charges, the trajectory of the charges advance against the reconciled accounts, and an unbroken payment history. That last item is the single most persuasive thing a tenant possesses, because what a landlord is protecting in a renewal is predictability.

It is also worth knowing what the alternative costs you, because that is the number that decides whether an increase is worth contesting. Moving means a fresh guarantee of up to two months' rent, half a month's agency commission plus VAT under the shared-commission rule, removal costs, a new entry inventory, and the gap between paying the new guarantee and recovering the old one, which arrives in two instalments and can take well over a year to complete. Against that arithmetic, a lawful increase of a few percent is frequently the cheaper option, and recognising this early keeps the conversation practical rather than adversarial.

Where you do intend to leave, remember that the timing is yours to control on an open-ended contract: three months' notice by registered letter, at any point, with no anniversary date to wait for.