Recurring water infiltrations from the upstairs flat: rights and remedies in Belgium

Identifying the cause: the essential first step

Before taking any action, you must determine the exact origin of the infiltration. The cause determines liability and the procedure to follow.

The most frequent causes of recurring infiltrations:

• Ageing pipes: worn joints, corroded pipes (landlord or co-ownership liability)
• Waterproofing failure: poorly sealed shower or bath (often the neighbour’s negligence)
• Defective washing machine: poorly connected or worn hose (neighbour’s negligence)
• Forgotten tap or overflow: pure negligence by the neighbour
• Structural problem: roof, terrace or load-bearing wall (co-ownership liability)

If you are a landlord and your tenant reports infiltrations, you have an obligation to act as lessor. A rental management software allows you to trace reports and actions taken.

Who is liable under Belgian law

Liability depends on the cause of the infiltration and the status of the upstairs occupant (owner or tenant).

Liability table

The theory of neighbourhood disturbances

Under Belgian law, article 3.101 of the new Civil Code enshrines the theory of neighbourhood disturbances: even without proven fault, a neighbour causing excessive disturbance must compensate the damage. This theory is particularly useful when the exact cause of infiltration is difficult to establish.

Owner vs tenant: who takes action?

• If you are a tenant: report to the landlord AND the building manager. The landlord is obliged to provide you with habitable premises (article 1719 of the Civil Code). If they fail to act, you can take action directly against the neighbour.
• If you are an owner-occupier: take action directly against the responsible neighbour and/or the building manager.
• If you are a landlord: your tenant can request a rent reduction if the problem persists. Act quickly.

The role of home insurance

How compensation works

In Belgium, fire insurance (which also covers water damage) works in two stages:

1. Your insurance compensates you for the damage in your property
2. Your insurance recovers from the responsible party’s insurer (subrogation)

You do not need to identify the responsible party or pursue them personally — your insurer handles it.

What insurance covers

The excess

The standard excess is 250 to 500 EUR per claim. For recurring infiltrations, each episode constitutes a separate claim with its own excess. This is why it is often more cost-effective to resolve the problem at source rather than multiplying claims.

Legal remedies in case of persistence

Step 1: formal notice

Send a registered letter with acknowledgement of receipt to the responsible neighbour (and to their landlord if they are a tenant). The letter must contain:

• Description of infiltrations (dates, frequency, damage)
• Photos and reports
• Request for repair within a reasonable deadline (15 to 30 days)
• Statement of intention to refer to the justice of the peace if no action is taken

Step 2: formal notice to the building manager

If the cause is related to common areas or the neighbour is unreachable, formally demand the building manager to take action. The building manager is obliged to maintain common areas in good condition.

Step 3: the justice of the peace

If formal notices remain unanswered, two procedures are available:

• Summary proceedings (urgent procedure): to obtain an order forcing the neighbour to carry out repairs. Timeline: 2 to 4 weeks.
• Proceedings on the merits: to obtain damages in addition to repairs. Timeline: 2 to 5 months.

Step 4: judicial expert assessment

If the cause is disputed, the judge can appoint a judicial expert to determine the origin of the infiltration and quantify the damage. Cost: 500 to 1,500 EUR, advanced by the claimant and reimbursed by the liable party if you win.

Conclusion: act fast to limit the damage

Recurring infiltrations do not resolve themselves. Each episode worsens the damage and increases repair costs. The key: document, insure and act in stages.

Key points to remember:

1. Identify the cause before taking any steps (pipes, negligence, structure)
2. Photograph and date each infiltration to build an evidence file
3. Declare to the insurer within 8 working days
4. Send a formal notice by registered post to the neighbour and/or building manager
5. Refer to the justice of the peace in summary proceedings if urgency warrants it

To track your tenants’ reports and document actions taken, use our rental management platform. A well-drafted lease specifies each party’s maintenance obligations and prevents disputes.