Water damage in your apartment and leaks: finding the source and getting it repaired

A brown damp patch is spreading across the bedroom ceiling, a little wider every week. It is water damage in your apartment, but the neighbour upstairs assures you that everything is dry at his place, the property manager (syndic) suggests waiting for an expert report, and the paint keeps blistering. There are three questions to untangle, in this order: where the water comes from, who owns the element at fault, and who pays.

In short: order matters more than speed. A leak file that opens with an argument over the bill, before the cause has been established, drags on for months. If you start by shutting off, dating and writing, you move faster, even when the leak turns out to be hard to find. This page follows that order, for a building in Flanders or in Brussels.

The first hours: shut off, date, write

Shut off first. For a visible leak inside the home, you call a plumber; if the leak is in the street, at the main stopcock or at the water meter, you notify the water company (Vlaanderen.be, a leak in the water pipes). The same page draws a line that will be useful later in the file: the water company lays all the pipes up to the water meter, and after the meter you are responsible for the pipes yourself. In Brussels, Vivaqua draws the same line with one nuance: the supplier manages the installation up to the meter and the meter itself, except for the seal fitted after the meter; beyond that seal, the installation is the owner’s responsibility. So a leak before the meter is reported to the water company, and a leak after it calls for a plumber.

Then date. Photograph the damage with a date reference, note the meter reading and keep the traces of the damage before any repair, even a temporary one. In a leak file, the timeline often decides the outcome: a stain whose spread you can show over six weeks carries more weight than a single observation.

Finally, write. Report the damage to the syndic in writing, even if you have already called. The report dates the information, opens the file and lets you ask for the building’s documents. The syndic must give co-owners access to all non-private documents or information relating to the co-ownership (Art. 3.89, § 5, 9°, Civil Code). For a leak, the useful documents are specific: the deed of division (acte de base / basisakte), the roof maintenance invoices, the call-out reports of recent years and the building’s insurance policy.

Where does the water come from, and is the element common?

The answer is in the articles of co-ownership before it is on site. The common parts belong to all co-owners according to their share, and where titles are absent or contradictory, the parts intended for the use of all or some co-owners are deemed common (Art. 3.84, Civil Code). The roof, the downpipes, pipes that run through several units and the waterproofing of a terrace are almost always among them. The exact boundary is explained in private and common parts, and the document that sets it in deed of division and co-ownership regulations.

One case comes up so often it deserves a name: the roof terrace reachable from only one apartment. The use is exclusive, the waterproofing remains common. This exclusive useGlossaryRight of exclusive use over a common part, such as a garden or a roof terrace, granted to a unit by the articles. The element remains a common part; the co-ownership regulations specify how its costs are shared. See the glossary does not turn the element into a private part; it simply reserves its use, and the co-ownership regulations set out how the related costs are shared. An occupant who has drilled through the covering to fix a planter, on the other hand, is personally liable, because the damage comes from what he did, not from the common element.

Two mistakes are expensive. The first is concluding that there is a leak when the damp mark is actually condensation: a condensation stain forms in cold corners and around masonry returns, varies with the season, and does not get worse after rain. The second is going after the neighbour upstairs because the water comes through his ceiling, when a common pipe built into his wall can leak without him seeing anything in his flat. The report of a professional who opens up, tests and locates is worth more than an exchange of letters based on guesswork.

Who repairs and who pays?

These are two separate questions, and mixing them up stalls the file. Whoever orders the works does not always bear the final cost, and the cost of the repair is a different item from compensation for damage inside an apartment.

The routine maintenance that prevents most of this damage, gutters included, is covered in maintenance of the common parts. As for the swollen parquet and the ceiling to be redone in the affected apartment, they belong to insurance rather than the building’s budget: water damage cover is a contractual extension, common but never automatic, and its exact definition decides whether the claim is paid. The building’s policy, what it covers and who files the claim are covered in co-ownership insurance.

Do you have to wait for the general meeting to get repairs done?

No, and this is the point most often overlooked in small buildings. The syndic does not need a vote to stop the damage getting worse.

“to take all protective measures and perform all acts of provisional management;”

Art. 3.89, § 5, 2°, Civil Code

Covering an open roof, closing a valve, replacing a perforated length of pipe, having a cellar dried out: these protective measuresGlossaryMeasures intended to protect the building or the rights of the association without waiting for a decision of the general meeting, such as a temporary repair after an insured loss. The syndic is responsible for carrying them out. See the glossary fall within the syndic’s remit, and the syndic reports on them at the next meeting (Civil Code, Book 3, Justel). The law points the same way on voting: protective works and acts of provisional management are exempt from the two-thirds majority required for works on the common parts, and can be decided by an absolute majority of the votes of the co-owners present or represented (Art. 3.88, § 1, 1°, b)). The rest of the rules for building works are described in building works in a co-ownership.

That leaves the case of a syndic who does nothing. There are two levers, in this order. The syndic calls the general meeting at the written request of one or more co-owners who together hold at least one fifth of the shares in the common parts, and the meeting must take place within thirty days of receiving the request (Art. 3.87, § 2). If the meeting is held and does not reach the required majority, any co-owner can ask the court for authorisation to carry out, alone and at the association’s expense, urgentGlossaryNecessary and urgent works to the common parts. If the general meeting cannot reach the required majority, any co-owner may obtain court authorisation to carry them out alone, at the association's expense. See the glossary and necessary works on the common parts (Art. 3.92, § 5). Prior court authorisation is the condition: works carried out first and then submitted for reimbursement do not give the same right.

The neighbour won’t open the door, and the file is stuck

Locating a leak sometimes means working inside a unit that isn’t yours, and an occupant’s refusal stops everything. Before going to court, conciliation before the justice of the peace costs a letter to the court registry and unblocks some of these situations.

If the disagreement continues, the law on neighbourly relations offers a route separate from fault-based liability. Neighbouring owners each have the right to use and enjoy their property, and each respects the established balance by not causing their neighbour a nuisance that goes beyond normal inconvenience (Art. 3.101, Civil Code). The court can then award financial compensation, reimbursement of measures taken on the affected property, or order measures that bring the nuisance back to a normal level. This route does not require proof of fault, which makes a big difference with a leak whose technical cause is still disputed.

The justice of the peace hears all disputes about co-ownership of buildings, whatever the amount claimed. The procedure, the documents to gather and the costs are described in justice of the peace and co-ownership disputes, and the amicable routes in disputes between co-owners.

A water bill that doubles: looking for the hidden leak

Water damage is not always visible. You read it first on the meter. Vlaanderen.be puts figures on two everyday leaks: a dripping tap loses 4 litres an hour, a faulty toilet cistern easily 25 litres an hour, and the page advises checking your meter regularly, because higher consumption can point to a leak (Vlaanderen.be, a leak in the water pipes). Twenty-five litres an hour is six hundred litres a day, without a single stain appearing on the ceiling.

The test needs just two readings: close every tap, note the reading, wait an hour without using any water, and read again. If the figures move, water is escaping somewhere. In a building supplied by a single main meter, the excess ends up in the common charges and is shared among co-owners who have nothing to do with it, which makes checking a collective matter. How to split water and heating unit by unit is covered in splitting water and heating costs, and how to read the items in annual service charge statement.

One last tip, about method. Keep a log of the file: date of the first observation, date of the report, date of each visit, names of those involved, amount of each quote. It costs nothing to keep and becomes the central document if the matter goes to court two years later, when nobody remembers the order of events any more. For the other situations in the life of the building, go back to the page day-to-day life in a co-ownership.