Sharing a flat in Luxembourg: the rules since colocation was regulated

Shared flats are a large part of how Luxembourg City actually houses its working population, and until August 2024 they existed in a legal grey area. The reform gave colocation a proper framework: one contract with the landlord, a written pact between the flatmates, and a defined procedure for the moment someone leaves. That last point is the one that used to generate most of the arguments, and it is now settled.

The structure the law now provides

• A single colocation contract is concluded between the landlord and the tenants together, rather than a set of unrelated individual leases.
• The flatmates draw up a written colocation pact among themselves, formalising the aspects of communal life and the practical arrangements of the arrangement.
• A flatmate wishing to be released before the end of the lease notifies the landlord and the other flatmates simultaneously, with three months' notice. The notification to the landlord is made by registered letter with acknowledgement of receipt.
• That flatmate must look for a replacement before the notice period expires.

The obligation to find a replacement is the heart of the reform. It converts what used to be an open argument about who absorbs the empty room into a defined duty with a deadline.

The colocation pact: what to put in it

The law requires a written pact and leaves its content largely to the flatmates. Treating it as a formality is a mistake; it is the document you will refer to when something goes wrong at eleven at night. The items worth covering:

• Who has which room, and what the rent share is for each. Rooms are rarely equal and a flat rate is rarely fair.
• How charges and utilities are split, and who holds the contracts.
• How the deposit is held and how it is settled when someone leaves.
• Cleaning of the common parts, in specific terms rather than in principle.
• Guests and overnight visitors, including how long is too long.
• Noise, and the hours that matter to whoever starts earliest.
• How a replacement flatmate is chosen, and whether the remaining flatmates have a say.
• What happens to shared purchases when someone leaves.

Write it when everyone is getting on. A pact drafted after the first dispute is a negotiation; one drafted at the start is a reference.

Joint liability, and the question to ask before signing

The critical financial question in any shared arrangement is whether you are liable only for your share or for the whole rent. Under a single contract with a solidarity clause, each flatmate can be pursued for the entire amount, and the person the landlord pursues is generally the one who is easiest to reach.

Read the contract on this point specifically, and understand the answer before you sign. If the clause imposes joint and several liability, you are underwriting your flatmates' reliability as well as your own. That may be perfectly acceptable among friends and less so among strangers assembled from an advertisement.

The alternative: a room let directly

A large part of the Luxembourg market operates differently, with each room let individually by the landlord under its own contract. In that model:

• You are liable for your room only, not for the flat.
• An empty room is the landlord's problem, not yours.
• You do not choose your flatmates, which is the trade-off.
• Rents are typically all-inclusive, which removes the charges reconciliation entirely.

Note that the rent cap applies to the total of rents in a multiple-lease arrangement as well as in a colocation, so splitting a flat into separate leases does not lift the ceiling.

For a first year in Luxembourg, the individually let room is usually the lower-risk option. You take on no liability for people you have just met, and you can leave without organising a replacement. For a group of friends who intend to live together for two or three years, the colocation contract is the better structure.

Practical arithmetic

A room in a shared apartment in Luxembourg City commonly runs between €600 and €900 per month, frequently all-inclusive, against €1,700 to €2,200 for a two-bedroom apartment excluding charges in the mid-priced districts, and €2,200 to €2,800 in the premium ones. For a single professional, sharing is not a compromise, it is the difference between saving and not.

The districts where the shared market is deepest are Bonnevoie, the Gare quarter and Hollerich, which is a function of price and of the tram rather than of anything else.

Choosing flatmates, which matters more than the flat

The apartment is fixed and the people are not, and almost every shared-living failure is a matter of mismatched expectations rather than of square metres.

• Working hours. Someone starting at six and someone finishing at midnight can live together, but only if they have said so first.
• Guests and partners. The most frequent source of friction, and the easiest to settle in advance. Agree what counts as a guest and what counts as a fourth occupant.
• Standards of cleanliness, which people describe identically and practise very differently. Agree a rota rather than a principle.
• Cooking and food. Shared or separate, and who owns what in the fridge.
• How long everyone expects to stay. A flat where one person is on a two-year posting and another is settling permanently will turn over, and it is better to know.
• Money. Who fronts the deposit, who holds the utility contracts, and how quickly people are expected to settle up.

Have the awkward conversation before signing, not after. Twenty minutes of directness at the start prevents most of what the colocation pact would otherwise have to resolve.

Three questions we are asked

What if I cannot find a replacement within three months?

The obligation is to look for one, and the practical outcome depends on what the contract and the pact say and on how the remaining flatmates and the landlord respond. This is one of the reasons to agree the replacement procedure in the pact at the outset rather than to discover it at the point of departure.

Can the landlord refuse a replacement we propose?

A landlord has a legitimate interest in the solvency and suitability of a new tenant, and a proposed replacement is normally subject to the same checks as any other applicant. What a landlord should not do is refuse without reason in order to keep the departing tenant liable. Put the proposal in writing so that the response is documented.

Do I need the colocation pact if we are all friends?

The law requires it, and friendship is exactly the situation in which people avoid writing things down. It takes an hour and it is what you will fall back on when one person moves in a partner, another stops cleaning, and a third takes a job in Frankfurt.

How we handle this

Most of the rooms we manage are let individually, with all-inclusive rents and no liability between tenants. It is the structure that produces the fewest disputes, and it is why we use it.

Current availability is on our rentals page .

Time is the hidden unit behind choosing flatmates, which matters more than the flat. For the question raised by “Choosing flatmates, which matters more than the flat”, the useful detail is not a generic list of advantages.

For how we handle this, note what you can see, what you can measure, what you need to ask and what would be expensive to change. For the question raised by “Choosing flatmates, which matters more than the flat”, the useful detail is not a generic list of advantages.

A stronger reading of practical arithmetic starts by asking what would change for the resident on an ordinary weekday.