Who Could Be Held Responsible If You Cause Water Damage to a Neighbour’s Unit?

This guide is part of our series on water damage and tenant insurance. 

A bathtub left running, a washing machine hose that gives way, a dishwasher that backs up overnight – water doesn't always stay where it starts. When it travels from one unit into another, the situation can shift from a private inconvenience to something which affects multiple renters. Often, that leaves you trying to work out who's responsible for what.

Understanding this, as well as how your tenant insurance policy might impact the situation, is a useful way to be prepared for this kind of scenario. Read on for an overview of who may need to act if water damage affects more than one unit.

Types of water damage which can impact a neighbouring apartment

• An overflowing bathtub or sink. If someone leaves running water unattended, the resulting overflow has the potential to spill out of a tub or sink. In extreme cases, this could even travel into a neighbour’s apartment. 

• A washing machine or dishwasher malfunction. A failed hose or a backed-up appliance can send water into a neighbour’s apartment. These kinds of machines use large quantities of water at once, often meaning a spill can cause significant damage to floors, walls, and neighbouring units. 

• A slow, unnoticed leak. Some leaks build gradually before they're identified, and by the time they're noticed, the issue could already be impacting other apartments. In the case of slow leaks, it’s often not until another unit is affected that they’re identified. In some cases, the leak could come from something you've installed in the past, and never noticed weren’t fully sealed. 

• Damage connected to shared building infrastructure. Occasionally the source sits within the building itself rather than a single unit, which can change how a tenant insurance policy applies compared to a leak traced to one renter directly.

Who might be responsible for water damage?

It’s not always possible to stop a leak or flood in one rental unit travelling into a neighbouring one. The relevant detail is that the damage extends beyond the renter's own space, which is part of what determines who might be held responsible for the damage in the event of a tenant insurance claim. 

Here’s what you should know about whose responsibility water damage might be. 

Remember, every scenario will be unique. Treat these as a rough idea of who might be responsible, rather than the guaranteed outcome. 

How a tenant insurance claim might progress

If you’re found to be responsible for a leak in a neighbour’s apartment, you may need to make a tenant insurance claim. Claims can vary significantly, especially when a third party like a neighbour is involved. Every provider will have their own process, but here’s roughly what you can expect: 

1. The damage is identified. This may be noticed by the affected neighbour, the renter believed to be the source, or a property manager.

2. The tenant insurance provider is notified. This is typically an early step, involving a description of what happened and which units were affected.

3. The situation is assessed. A tenant insurance provider may review the source of the water, the extent of the damage, and documentation such as photos or repair estimates.

4. A resolution is reached. Depending on the assessment, this can involve a settlement connected to one or both tenant insurance policies, or a determination that the situation falls outside what either policy covers.

What tenant insurance may not cover

There might be occasions where tenant insurance won’t be able to support you financially in the case of a leak into a nearby unit. A tenant insurance policy in this context generally does not extend to:

• Intentional acts. Deliberate damage is typically treated differently from an accidental leak.

• Long-term neglect. Damage connected to an issue left unaddressed for an extended period is often viewed differently than a sudden event.

• Damage to shared structural areas owned by the landlord. This may fall under a separate policy altogether, rather than either renter's tenant insurance.

The information provided on this page is intended for general educational purposes only and does not constitute insurance advice, a recommendation, or an offer to sell insurance. Every individual's insurance needs are unique and depend on personal circumstances. We encourage you to consult with an independent licensed insurance broker in your province who can assess your specific situation and recommend appropriate coverage.