Judging daylight in a Luxembourg apartment when the viewing is at the wrong time

Luxembourg sits at 49 degrees north. In late December the sun rises around half past eight and sets before half past four, and a large share of the days between November and February are overcast. An apartment that photographs beautifully in June can be a lamp-lit box for four months.

Establish orientation before you judge anything

The first thing to do at a viewing is not to look at the light but to determine which way the windows face. Open the compass on your phone in the main living room and in each bedroom, and write the bearings down. Everything else is interpretation of that single fact.

South-facing living rooms get usable light through the middle of the day all year, and in a Luxembourg summer can overheat, particularly in newer buildings with large glazed areas and no external shading. East-facing rooms take the morning, which suits a kitchen or a bedroom. West-facing rooms take late afternoon and evening, which suits a living room for someone who works standard hours. North-facing rooms receive no direct sun at all, and in a Luxembourg winter that means artificial light from mid-afternoon.

North is not automatically a refusal. A north-facing study or a north-facing bedroom is often pleasant, and north light is even and free of glare. A north-facing living room with a single window in a converted townhouse is a different proposition, and it should be reflected in the rent rather than absorbed by you.

What blocks the light, which matters more than the compass

Orientation tells you where the sun is. Obstruction tells you whether it arrives.

Stand at each window and measure, by eye, the angle to the top of whatever faces you. If a building opposite rises above roughly forty-five degrees from your window, a south-facing room on a low floor will receive very little direct sun in winter, when the sun stays low. This is the single most common disappointment in the older, denser parts of Luxembourg City: courtyard apartments in the Gare district and lower Bonnevoie can be south-facing on paper and dark in practice.

The city's topography adds a second layer. Luxembourg is a plateau cut by the Alzette and Pétrusse valleys, so an apartment in the Grund, Clausen or Pfaffenthal can have a valley wall to one side. That is spectacular and it also removes a chunk of the sky. Ask on which side the slope sits.

Trees are the variable people forget. A viewing in February with bare branches and a lease starting in May can produce a considerably darker flat than the one you agreed to.

The measurements that predict light better than impressions

• Window head height. How far the top of the window sits below the ceiling. Light penetrates a room roughly in proportion to the height of the window head, not to the width. A tall narrow window lights a room more deeply than a wide low one.
• Room depth from the window wall. As a working rule, useful daylight reaches about two to two and a half times the window head height into the room. A living room seven metres deep with a window head at 2.2 metres will have a dark far end regardless of orientation.
• Reveal depth. How thick the wall is around the window. Older Luxembourg buildings have deep reveals, which are handsome and which cut the angle of light entering the room.
• Number of external walls. A corner apartment with windows on two elevations behaves entirely differently from a single-aspect flat with the same floor area.

Reading a room that is viewed after dark

Many viewings in a Luxembourg winter happen when it is already dark, and you can still assess a great deal.

Turn off every light in the room and look out. What you can see of the sky is what will light the room in daylight. If the view is a wall at close range, you have your answer. Then look at what artificial light exists: whether there are ceiling points in each room, where the sockets are, and whether the living room has any switched socket for lamps. Unfurnished lettings in Luxembourg frequently come with bare fixtures or none, and a room with one central ceiling point and no lamp sockets is expensive to light well.

Ask the agent directly which way the flat faces and what floor it is on. Then verify the orientation yourself, because the answer is often given from memory.

What you can change and what you cannot

Two of the three variables that determine how a room feels are within a tenant's control, and one is not.

Fixed: orientation, obstruction, window size and position, floor level. None of these can be altered by a tenant, and altering them is generally not permitted by the co-ownership even for an owner, because the facade is common property.

Changeable: window treatments and surfaces. Heavy curtains hung inside the reveal cover glass permanently; hung outside and above the reveal, they clear the window entirely when open. In a dark room that difference is significant and it costs nothing but a longer curtain pole. Pale, matt wall finishes and a mirror positioned to face a window rather than to face into the room both help.

Changeable with care: lighting. Three or four light sources at different heights make a north-facing Luxembourg living room usable in February; a single ceiling fitting does not. Check the lease and the building rules before installing anything wired, and keep additions to plug-in fittings unless you have written consent.

The energy passport connection

Ask for the energy passport, which every property offered for rent in Luxembourg must have. It does not grade daylight, but it tells you about the glazing and the envelope, and there is a practical relationship between the two: large single-glazed windows in an unrenovated building bring light and lose heat, while a well-insulated newer flat may have smaller openings. Reading the passport alongside your own orientation notes gives you the trade-off in one view rather than discovering it in January.

Three questions we are asked

How much is a dark apartment worth in rent terms? There is no published discount, and the statutory rent cap in Luxembourg is calculated from the capital invested in the property rather than from amenity, so light is not priced into the ceiling. What it changes is how long the property stays on the market, which is your negotiating position rather than a formula.

Should I refuse a ground-floor flat? Not automatically. Ground floors in Luxembourg often come with a garden or terrace, which is a real gain. Check the level of the facing boundary and whether the outdoor space is overlooked, and remember that exclusive use of a garden is usually a right over common property, so what you may plant or build there is governed by the co-ownership.

Can I ask to visit twice, at different times? Ask. In a slower month you will get it. Where you cannot, choose the viewing slot closest to the time of day you are normally at home, and treat photographs taken in summer as evidence of nothing about winter.

Overheating, the summer half of the same question

Daylight is discussed in Luxembourg as a winter problem, and the newer stock has created a summer one. Large glazed areas facing south or west, in a well-insulated building with no external shading, produce living rooms that are uncomfortable on a July afternoon.

Internal blinds and curtains stop glare but not heat, because the energy has already passed the glass. External roller shutters, which are common in Luxembourg construction, stop it before it enters. At a viewing, check whether shutters exist on every window or only some, whether they are motorised, and whether they actually run. A jammed shutter is either broken before you arrive or it becomes yours.

What you may not do is fit external shading yourself. The facade is almost always common property in a copropriété, which rules out awnings, external blinds and air-conditioning units without the co-ownership's consent, regardless of what the landlord says. Ask what shading exists rather than planning to add it.