Water Leaks in a Condo — Who Pays When It Comes Through the Ceiling

No condo problem ignites a neighbour war faster than a leak. It has every ingredient of conflict: visible damage, tangible repair costs, an invisible cause, and at least three parties able to point fingers — upstairs, downstairs, and the juristic person. The good news is that condominium law allocates liability more clearly than most people assume; real disputes usually come from parties not knowing the rule and nobody preserving proof of the source. Here is the liability map and the correct playbook from the first drip.

The Core Principle: Find Whose Property Contains the Source

Condominium law splits a building into private property — each unit's interior including systems serving that unit alone — and common property: the structure, external walls, roof deck, and shared systems such as main risers in the service shafts. Liability follows the split: damage originating in someone's property is that party's responsibility, both fixing the cause and compensating consequences. Every leak dispute therefore compresses into a single question — where exactly is the source?

The working map for most cases: water dripping from a bathroom ceiling usually traces to the upstairs unit's degraded floor waterproofing or a leaking drain pipe beneath their slab — both private property of the upstairs owner, who bears responsibility. Conversely, leaks from main risers inside shafts, rain seepage through external facade walls, or roof-deck leaks into top-floor units originate in common property, making the juristic person liable for both repair and damages. On the supply side, the water meter is the boundary: before the meter is the building's shared system; after it, the pipework is the unit's own.

From First Drip to Resolution — the Correct Sequence

When you spot a drip or stain, the first move is not an angry knock upstairs — it is evidence. Photograph and video the entry point, volume, time, and damaged belongings; log every recurrence. Then notify the juristic office in writing immediately (official channel, reference number requested). Routing through the juristic matters for two reasons: it holds the authority to coordinate access into neighbouring units, and its technician is the neutral witness whose source-finding underpins the entire liability question.

Proof is sometimes trivial — open the ceiling and watch the upstairs drain drip — and sometimes requires tests such as flooding the upstairs bathroom or running a pipe camera. Initial inspection costs typically sit with the juristic as building custodian. Once the source is established, the liable party pays for the cause and the downstream damage; good practice is collecting two or three repair quotes and agreeing figures in writing before work starts. If the liable party stalls, escalate in order: a formal juristic letter → mediation channels (district office / consumer protection) → a civil damages claim, which well-evidenced leak cases routinely win.

Where Insurance Enters

Policy	Whose	What it covers in a leak
Building insurance (held by the juristic)	Common property	Specified perils to common systems (e.g., burst risers); some policies include third-party liability
Unit contents insurance (owner's own)	Your unit	Water damage to your interior and belongings — claimable fast without waiting for fault to be settled; your insurer pursues recovery
Third-party liability rider (attached to unit policy)	Your unit	When your unit is the source damaging the room below — the insurer pays in your place

The strategic advice: every condo owner should hold a unit policy including water damage and third-party liability. Premiums run a few thousand baht a year, and they transform a drawn-out blame war into "claim on my own policy first, let the insurer chase the liable party" — faster, and it removes emotion from a dispute with someone you meet in the lift daily.

FAQ

The upstairs unit refuses access for inspection — what now?

Ask the juristic in writing to exercise its powers under the building rules, which almost universally oblige co-owners to allow reasonable access for inspecting and repairing systems affecting other units. Repeated refusal while damage continues becomes evidence of negligence against them when the matter reaches damages or court.

I bought a resale unit and found an old leak painted over — can I claim against the seller?

This falls under the seller's statutory liability for defects, particularly where concealment can be shown. Gather evidence — traces of the old damage, a technician's opinion — and negotiate repair costs before resorting to court. It is also why resale inspections should always include opening the ceiling beneath bathrooms.

The leak happened during the upstairs renovation — who pays?

The upstairs owner is liable to you, and recovers from their contractor under their own agreement. Properly notified renovations also lodge a work deposit with the juristic — ask how much is held; it is an additional avenue of recovery.

Conclusion

A leak is not luck; it is a system: find the source, place it in private or common property, and liability resolves itself. Preserve evidence from minute one, run everything through the juristic in writing, and hold your own unit policy as the shortcut that removes the fight. What usually escalates into a neighbour war can end professionally instead. More guides on condo rights and co-living are on the MyProperty blog.