Definition : Fraction

Right of ownership comprising at least one private portion (e.g. an apartment) and a share (%) of the common portions reserved for all (e.g. the corridors) or, as the case may be, only for some of them (e.g. a balcony). The share in the common portions of a fraction is equal to its relative value. In addition, each fraction constitutes a separate entity and may be the object of a partial or total alienation. It includes, as the case may be, the right of use of the common portions for restricted use.

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Any co-owner may have the relative value of their fraction, as well as the allocation of common expenses, revised according to certain conditions and formalities. To do so, it is necessary to proceed with an appeal to revise the relative value of the fractions. Furthermore, a co-owner may wish to modify the relative value of their fraction. Therefore, they will have to request the prior consent of the Board of directors or the general meeting of co-owners, depending on what is required. This revision or modification of the relative value has an impact on the proportionate share of the right of ownership (which the co-owners hold in the common portions), the number of votes they can cast at the meeting of co-owners and the allocation of common expenses. On this question, Article 1064 of the Civil Code of Québec stipulates that: “Each co-owner contributes to the common expenses in proportion to the relative value of his fraction.”
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In divided co-ownership, the right of ownership is divided, among the co-owners, by "fractions", each comprising a materially divided private portion (e.g. an apartment, a parking or storage space, and sometimes even a plot of land) and a share  of the common portions. To each fraction is attached an undivided right of ownership in the common portions, and sometimes the right to use the common portions for restricted use. The fraction is the result of the division of a building to create a condominium. In other words, the addition of all the fractions constitutes, by the effect of the publication of a declaration of co-ownership, the condominium building.
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When you purchase an apartment in an immovable held in divided co-ownership, you become the owner of your dwelling (private portion), but also the owner of an undivided portion of the immovable designated as common portion (for example: the ground, balconies, major components such as foundations and main walls). This, taken as a whole, including the common and private portion, is designated in legalese as: a fraction. The fractions may contain one or more private portions. They are described in the declaration of co-ownership in the Section entitled the Description of the fractions, and they are physically identifiable. They may include an apartment, but also a parking space or a parcel of land (for example in townhouses or semi-detached homes).
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Question: In the declaration of co-ownership, there is a table determining the relative value of the apartment I plan to buy. And I am told that the allocation of common expenses is particularly in relation to this same "relative value". I wonder what exactly it is and whether it can be changed at the time of purchase?
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