Price per square metre in Luxembourg, and the four adjustments it needs

It is the metric everyone uses and it compares almost nothing on its own, because in a co-ownership two apartments at the same rate can carry very different obligations attached to the building behind them.

Adjustment one: make the surfaces comparable

Luxembourg listings mix total surface, habitable surface, terraces, balconies, cellars and parking lots in a single headline figure. A property advertised at 110 m² including a 15 m² terrace and a 10 m² cave is an 85 m² apartment, and a rate calculated on the advertised number is wrong before any comparison begins.

Strip every listing back to habitable surface, and check the rooms drawn on the plan against the figure quoted. The authoritative description of a lot is in the acte de base, which is worth requesting before an offer rather than reading at the deed.

Then look at how much of the habitable surface is circulation. A long internal corridor serving four rooms can absorb eight or nine square metres that appear in the total and serve nobody, so two apartments of identical surface are not equivalent purchases.

Adjustment two: the characteristics the rate conceals

Once the denominators match, the rate still says nothing about the features that determine both liveability and resale.

• Floor level and lift. In the converted stock that dominates Limpertsberg, Belair and the Gare district, a fourth floor without a lift removes a large share of future buyers.
• Orientation and obstruction. Luxembourg City is a plateau cut by the Alzette and Pétrusse valleys. A south-facing courtyard flat on a low floor can receive very little winter sun, when the sun is low and sets before half past four in late December.
• Ceiling height, which ranges from around three metres in a nineteenth-century conversion to considerably less in a 1970s block, and changes how a given area feels more than almost any other variable.
• Parking and cave, both of which widen or narrow the buyer pool.

Adjustment three: the building's obligations

A buyer in a copropriété acquires a share of common parts expressed in millièmes and a set of collective obligations. Three documents put a number on them: the reconciled charges accounts for two completed years, the minutes of the last three general assemblies, and the balance and annual contribution of the fonds de travaux, compulsory since 1 August 2023 with a minimum set per square metre of energy reference surface and graded by the building's thermal insulation class.

An apartment priced 5% below a comparable one, in a building with a thin fund and a facade approaching renovation, is not cheaper. It is the same price with the invoice deferred and its timing decided by other owners.

Works voted and not yet called for are an existing liability attaching to the lot and should be subtracted at full value rather than discounted.

Adjustment four: the cost of acquiring, which is not linear

This is the adjustment most commonly missed. Duties are 7% of the price, being 6% registration and 1% transcription, with regulated notary emoluments of roughly 1% to 1.5% plus VAT, disbursements and any mortgage deed on top, and these are normally excluded from financing.

Against the duties sits the Bëllegen Akt: €40,000 per buyer and €80,000 for a couple acquiring together, permanent since July 2025, conditional on personal occupation as principal residence from entry into possession or within two years, with a minimum €100 always payable.

Because the credit is a fixed amount rather than a percentage, it fully absorbs the duties up to a certain price and only partly above it. The effective cost of acquiring therefore rises with price in a way the headline rate conceals, and two properties at the same rate per square metre but different absolute prices do not cost the same to buy.

What the energy class now does to value

The passport has become a financing variable rather than only a running-cost indicator. Classes A to C generally attract the best lending conditions, while F to H typically triggers a stricter analysis with the works integrated into the buyer's financing plan.

That narrows the pool of purchasers who can finance a poorly performing property, which is both a negotiating argument now and a resale constraint later. In an apartment it is compounded by the fact that the envelope is largely common, and improvement works require an absolute majority of all millièmes, present or not.

A comparison that survives a week of viewings

Record the same fields for every property on the same evening: habitable surface excluding terrace and cellar; price and price per normalised square metre; reconciled charges; works fund contribution and balance; works voted and not called; energy class; floor and lift; orientation; parking; cave size; minutes on foot to the nearest stop; and your own acquisition figure calculated with your actual credit position.

Then add one subjective column and only one: whether you would be content there on a wet Sunday in November.

Three questions we are asked

Are published district averages useful? As a sanity check on a whole district, yes. As a basis for pricing a specific property, no, because they aggregate across floor level, lift, orientation, energy class and building condition.

Should a terrace be valued per square metre? Not at the same rate, and frequently it is a right of exclusive enjoyment over common property rather than a private part, which governs what you may build, plant or store there.

Does a low rate ever simply mean a good deal? Occasionally, usually because of time on market or financing friction from a poor energy class. Identify which of the two applies before assuming the third possibility, which is that the building carries something the documents will reveal.

Using the adjusted figure in a negotiation

Once the four adjustments are made, the resulting number is useful for your own decision and weak as a negotiating instrument on its own. Sellers do not price against your spreadsheet.

What moves a Luxembourg seller is more specific. Time on market, which you can ask about and which has a reason worth identifying. Financing friction, where a poor energy class narrows the pool of purchasers who can finance the property without folding works into the loan, and which is evidenced by the passport rather than by opinion. And documented liability, where works voted at the general assembly and not yet called for are an existing obligation attaching to the lot.

Present the offer on price alone and keep the reasoning separate, with a quotation from a named trade or a line from the assembly minutes behind it. Then remember what acceptance triggers: a compromis de vente, which is a binding contract rather than a preliminary step, so the rigour belongs before the offer rather than after it.