Appurtenant cellars in a condominium: ownership and use

In a condominium the cellar is normally an appurtenance of the apartment, that is, an asset durably intended to serve the main unit. Under Article 817 of the Italian Civil Code, appurtenances are things intended for the service or ornament of another thing, and the intended purpose may be established by the owner. The appurtenant cellar therefore belongs exclusively to the owner of the apartment to which it is linked, not to the condominium community, and follows the fate of the main unit unless the deed expresses a different intent.

What the appurtenance link means

The appurtenance link is the functional bond that joins the cellar to the apartment. Thanks to this link, when the apartment is sold the cellar is transferred too, if the deed does not provide otherwise. Article 818 of the Italian Civil Code states that legal acts and relationships concerning the main thing also cover the appurtenances, unless otherwise provided. The appurtenance, however, may be the subject of separate acts or relationships: the cellar can be sold separately, dissolving the link, if the owner wishes and provided there are no prohibitions in the rules or statutory constraints.

It is important not to confuse the exclusively owned appurtenant cellar with common cellar spaces, which Article 1117 of the Italian Civil Code counts among the common parts when they are intended for collective use. A basement space not attributed to a single unit and used by everyone remains common; a cellar identified in the land registry and assigned to an apartment is instead private.

Who owns the cellar

Ownership of the cellar is ascertained from the title deeds, that is, the purchase deeds and the attached cadastral floor plans. If the cellar is identified as an appurtenance of the apartment in the deed, the owner is whoever bought the unit. Absent clear indications, one must go back to the source deed and the filed floor plan. The cellar number and its cadastral correspondence are the decisive elements to avoid disputes between neighbors.

If one owner claims a cellar is common while another claims it as their own, the matter is resolved by comparing the titles. In the absence of proof of exclusive ownership, the presumption of common ownership under Article 1117 applies to spaces intended for common use.

Use and change of intended purpose

The owner may use the cellar according to its intended purpose, typically storage. Changing its use, for example turning it into a habitable space or a workshop, faces more limits:

• compliance with the condominium rules, which may prohibit certain noisy or unhealthy uses
• the prohibition on altering the architectural decorum and safety of the building
• compliance with planning and building rules, which govern the habitability of basement spaces
• the prohibition on damaging common parts, for example opening new openings in load-bearing walls without authorization
• respect for the other owners regarding noise and odor emissions

A non-compliant use of the cellar, such as installing unauthorized systems or storing hazardous materials, can be challenged by the administrator and the other owners to protect common safety.

Damp, seepage and costs

Basement cellars often suffer from damp and seepage. Liability depends on the cause. If the damp comes from a defect in the common parts, such as failed waterproofing of the retaining walls or a break in common piping, the repair and damages fall on the condominium under the criteria of Article 1123. If instead the problem arises from poor use of the individual cellar or from an action by the owner, the cost falls on whoever caused it.

Costs of common parts that also serve the cellars, such as the lighting system of basement corridors or structural maintenance, are split under the ordinary rules taking use into account. The administrator should document the origin of damp phenomena with expert reports, so as to attribute costs correctly.

Cellar and the owners' meeting

The appurtenant cellar does not grant an autonomous right to vote at the meeting, which belongs to the owner of the property unit as a whole. Decisions concerning common basement spaces, on the other hand, follow the meeting majorities and involve the interested owners. Distinguishing what is a private appurtenance from what is a common part is essential for a correct summons and for computing the quorums.

Managing appurtenances and documents

Orderly management of appurtenances requires keeping the condominium register up to date, indicating which units have a cellar and with what cadastral data. This helps with handovers, sales and correct cost splitting. A digital archive of titles and floor plans reduces the risk of errors and disputes.

AmministraPro lets you record appurtenances in the condominium register and archive floor plans and documents linked to each unit. You can see how register management works on the /funzioni page and choose the plan best suited to you on the /prezzi page.