Water Damage Between Private Apartments: Who Is Liable

When water from one apartment reaches the flat below and the cause lies inside a private property, a fixture, an appliance or the membrane of an exclusive-use balcony, liability falls not on the condominium but on the owner of the unit where the leak starts. Article 2051 of the Italian Civil Code applies, governing liability for damage caused by an item in one's custody: whoever has control of the item answers for the damage unless they prove a fortuitous event. The condominium steps in only if the source of the damage is a common part.

When the damage is between private parties and does not concern the condominium

The first step is to identify the physical source of the leak. If it starts from a bathroom, a kitchen, a pipe serving a single apartment, an exclusively owned terrace or balcony, or an appliance, the damage is between two private parties and the condominium remains extraneous to it. The owner of the unit the water comes from is the custodian of that item under Article 2051 and answers to the injured neighbor.

Custodial liability is of the strict type: the injured party only has to prove the causal link between the item in custody and the damage, while the custodian must prove a fortuitous event, that is an unforeseeable and external event that broke that link. There is therefore no need to prove the neighbor's fault or negligence: it is enough to connect the water to their property.

Owner or tenant: who pays

If the apartment is rented, a distinction must be drawn according to the nature of the fault. As a general rule the tenant answers for damage tied to the use and ordinary maintenance of the property, while the owner answers for structural defects and the systems that fall to them. Custody, and with it liability toward the injured third party, follows whoever has actual control over the item.

• Fault from use or poor ordinary maintenance (tap, gasket, appliance): tends to fall on the tenant
• Structural or fixed-system defect (embedded pipe, terrace membrane): tends to fall on the owner
• The injured party can still act against both, who will then settle their internal relations
• The policy of the liable party's apartment, if active, covers civil liability toward third parties

The manager's role when the damage is between private parties

The condominium manager is not required to compensate damage arising from a private property, but still has a useful coordinating role. They can facilitate access to common spaces for inspections, check that the source is not in fact a common riser, and put the parties and their insurers in contact. If, however, the leak were in a common pipe, the matter changes nature and becomes the condominium's liability under Articles 1117 and 2051.

It is good practice for the manager to document the condominium's position in writing, clarifying that the source is private and that the managing body is not liable. This prevents the condominium from being dragged into a dispute that does not concern it and protects the common fund.

How to prove the damage and its origin

Proof is the most delicate aspect. The injured party must demonstrate the existence of the damage, its extent and its connection with the neighbor's property. Everything must be documented promptly with photographs, videos, a description of when the stains appeared and, if necessary, a technical report identifying the point where the water entered.

• Dated photographs of the stains and detached plaster
• A technician's report establishing the origin of the leak
• Repair estimates to quantify the damage
• Written notice to the neighbor and their insurer
• A preventive technical assessment if the parties cannot reach an agreement

How to close the matter amicably

Most damage from leaks between neighbors is resolved without litigation, through the insurers of the two units. The fastest route is filing a claim with both policies, a meeting between the loss adjusters and an agreed refund. Litigation is worthwhile only when the counterparty denies all liability or the amount is significant and there is no insurance cover.

Keeping order among units, owners and claims

Distinguishing precisely which damage is private and which is common requires an always-updated register of units, owners, tenants and policies. With AmministraPro the manager keeps in one place the data of each unit, the owners' contacts and the history of communications, so as to respond at once and document the condominium's position. The features are described on the /funzioni page and the plans with their costs on the /prezzi page.