Understanding a home's floor areas: living area, weighted area, PPE and thousandths

A home's floor areas are not all equal: the living area counts only living spaces, the weighted area adds balconies and outbuildings with a reduced weighting according to the applicable rules, and in a PPE the thousandths allocate costs and voting rights among the owners.

The living area

The living area is the floor space actually used for living. It includes the living room, bedrooms, kitchen, internal corridors and bathroom. It is the area where you move around and place your furniture.

Two points deserve attention. First, load-bearing walls and partitions do not count in this measurement, even though they take up a real share of the built volume. Second, areas with too low a ceiling height may be excluded or reduced, which often applies to converted attics under a sloping roof. The exact rule depends on the standard or regulations applied, and it is not the same everywhere.

Remember the principle: the living area answers the question of how much living space there is on the floor, without including outbuildings or outdoor areas.

Ancillary areas and weighting

A home almost always has spaces that are not living area in the strict sense. A balcony, a terrace, a cellar, an attic storeroom, a private garden or a parking space add practical value, but they are not lived in the same way as a living room.

This is where the weighted area comes in. Rather than simply adding up every square metre, a coefficient is applied to these ancillary areas to reflect their actual use. An outdoor terrace does not weigh as much as a heated living room. A cellar without natural light weighs even less. The result is a weighted area, intended to reflect the overall practical value of the property.

A word of caution is needed here. The coefficients applied vary according to professional practice and reference documents. There is no universal scale that applies everywhere in the same way. The same terrace may therefore be weighted differently from one file to another. When a weighted area is stated, the real question becomes what basis it was calculated on.

Thousandths in a PPE

As soon as a building is divided into condominium ownership (PPE), each unit receives a share expressed in thousandths. These thousandths represent the weight your apartment carries within the condominium as a whole.

In practice, this share works on two levels. It serves as the key for allocating common costs, such as roof maintenance or shared heating. It also determines your weight in votes at the owners' general meeting. A unit with more thousandths contributes more to costs and carries more weight in collective decisions.

The thousandths are set in the PPE constitution deeds and recorded in the land registry. They do not correspond mechanically to the living area: they take several factors into account, including the ancillary areas attached to the unit. A buyer should therefore read this share as carefully as the floor area itself, as it commits them to regular payments throughout their ownership.

Pitfalls when reading a listing

The first pitfall is confusing living area with weighted area. A weighted area will almost always be higher, since it includes ancillary areas. Comparing the weighted area of one property with the living area of another completely distorts your judgement.

The second pitfall comes from generously stated areas. A listing that adds together a balcony, a cellar and low-ceilinged attics without saying so inflates the figure shown. The price per square metre then looks more attractive than it really is.

The useful reflex is to ask which area is being referred to and on what basis it was measured. If the information is not clear in the file, that is a signal to dig deeper before comparing or making an offer.

Why it matters

The area used directly affects the price per square metre, and therefore your benchmark for comparing several properties. In a PPE, the thousandths also determine recurring payments and your influence within the condominium. A seller who presents an honest floor area inspires trust and avoids late-stage disputes. A buyer who knows how to read these measurements negotiates on a solid basis.

The only way to know the area actually used for a home and its value is to check it on site. A valuation lets you start from reliable figures, and our buying page brings together the useful benchmarks before you commit.

Sources

Qualitative article. The definitions presented (living area, weighted area, PPE share in thousandths) refer to standard concepts in Swiss property law and practice. Exact coefficients and values depend on the PPE regulations, the deeds in the land registry and the professional standards applicable to each property.