Renting

The cave: the eight square metres that decide whether a Luxembourg flat works

Almost every apartment building in Luxembourg has cellar storage, and almost every listing mentions it in three words. Its size, its dryness and what the building rules permit inside it determine whether an efficiently planned apartment is liveable or permanently cluttered.

Why it matters more here than in most markets

Luxembourg apartments, particularly newer ones, are planned efficiently on floor area and thin on internal storage. Unfurnished lettings frequently have no wardrobes, and built-in cupboards are the exception rather than the rule. At the same time the country's rhythm generates bulky possessions: winter tyres, which are effectively required in Luxembourg winter conditions, ski equipment, bicycles for a city that has invested heavily in cycle infrastructure, and suitcases for people who travel.

All of that lives in the cave or it lives in your hallway. An apartment with a generous cellar and one with a 2 m² locker are not the same product, and the listing will describe both as having a cave.

What to check, in the cellar itself

Ask to be taken to the cave at the viewing rather than told it exists. Bring a phone torch, because cellar lighting in older Luxembourg buildings is frequently on a timer and frequently inadequate.

• Measure it. Floor area and, separately, height. A cave with a low ceiling or a duct running through it at head height loses most of its usable volume.
• Check for damp. Look at the base of the walls for salt bloom or a tide mark, feel whether the air is noticeably colder and heavier than the stairwell, and look at the ceiling under any pipework. A damp cave stores nothing made of cardboard, fabric or paper, which is most of what people want to store.
• Check the door and the lock. Whether it is a full-height lockable door or open mesh, and whether the key is on the same set as the apartment.
• Check it is empty. A cave still holding the previous tenant's belongings becomes your problem to resolve, and it should be recorded as empty on the entry inventory.
• Confirm which one is yours. Caves are normally attached to a specific lot and numbered. Have the number written into the lease or the inventory.

What the building rules say about it

The cave is inside a copropriété and is therefore governed by the building's règlement de copropriété and, where one exists, the règlement d'ordre intérieur. Those documents are drawn up by the owners and administered by the syndic, and your landlord cannot grant you rights the co-ownership has not granted them.

Two restrictions appear almost universally. Nothing flammable may be stored, which in practice covers fuel, gas canisters and often paint. And access routes through the cellar corridor must be kept clear, which is a fire-safety provision and is enforced rather than aspirational.

Underground parking spaces carry the same logic and it surprises people: storing tyres, bicycles or boxes in a parking lot is prohibited in many Luxembourg buildings for the same fire-safety reason. If your plan for the tyres is the parking space, check before you sign.

Bicycles, which are a separate question

Many Luxembourg buildings have a dedicated local à vélos, and where they do, bicycles are usually required to live there rather than in the cave or the corridor. Where they do not, the cave is the only option and its door width becomes relevant.

Ask three things: whether a bicycle store exists, whether access is on the same key or badge, and whether there is a charging point if you are considering an electric bike. Storing an e-bike battery is also frequently covered by the building's rules on flammable items, which is worth confirming rather than assuming.

How the cave connects to your charges and your deposit

Cellar corridors, their lighting and their maintenance are common parts, funded through the charges you pay monthly as an advance and which are reconciled annually against accounts approved by the general assembly of co-owners. A building that keeps its cellar dry and lit is a building that is being maintained, and maintenance is what keeps charges predictable.

At the other end, the cave belongs on both inventories. Record its condition and its emptiness at entry, and empty it completely before the exit inspection. It is the space most often forgotten on moving day and the most visibly full on inspection day, and anything left there can be recorded against a rental guarantee that is capped at two months' rent and returned under a defined statutory procedure.

What to do if the cave is inadequate

Three routes, in order of cost.

First, ask whether an additional cave is available in the building. Where a lot has been let separately or an owner has spare capacity, this is sometimes arranged for a modest monthly figure, and it should be documented in writing rather than agreed verbally.

Second, reconsider the apartment's internal storage before you sign. Measure the longest uninterrupted wall in each bedroom at the viewing, because a room with three doors and a radiator may not take a wardrobe at all, and no amount of cellar space compensates for having nowhere to put clothes.

Third, external storage. Self-storage exists around Luxembourg City and in the southern communes, and it is a real monthly cost that should be added to the rent when you compare properties rather than discovered in month three.

Three questions we are asked

Is the cave included in the advertised surface? Sometimes, which is precisely the problem. Check the plan against the headline figure: an apartment advertised at 95 m² that includes a 10 m² cave is an 85 m² apartment, and the two are not comparable with a listing that quotes habitable surface only.

Can I put a freezer or a washing machine in the cave? Only if there is a supply and the building rules allow it. Both are common in Luxembourg buildings and neither can be assumed. Ask the syndic through your landlord, in writing.

The cave is damp. Is that the landlord's problem? Record it on the entry inventory in specific terms, with photographs, and raise it in writing. Whether remediation falls to the landlord or to the co-ownership depends on the cause and on the allocation of repairs in your lease, which is one of the clauses worth reading before you sign.

Reading the building through its cellar

The cellar is the least presented part of any Luxembourg apartment building and therefore the most honest. Ten minutes there tells you things the apartment itself is arranged to conceal.

Look at the cellar corridor lighting, the state of the pipework, and whether there is any sign of past water ingress. Look at the boiler room if it is visible: a collective heating plant in its twentieth year is a future special assessment for the owners and, in time, a charges increase for you. Look at whether the corridors are clear or whether every tenant is storing things outside their cave, which tells you how the syndic enforces the building rules.

All of it connects to your budget. Cellar corridors, lighting, the lift and the heating plant are common parts funded through the charges you pay as a monthly advance and which are reconciled annually against accounts approved by the general assembly of co-owners. Ask for the last two years of reconciled figures rather than for the advance, because the advance is an estimate and the reconciliation is the truth. A building that maintains its least visible spaces is usually a building whose charges do not surprise anyone.