The condo owner’s complete leak playbook — the 4 classic scenarios, who pays under strata law, JMB approvals, neighbour diplomacy and honest fix prices.
Almost every condo waterproofing case in the Klang Valley is one of four stories. Knowing which one you are in decides everything downstream: who pays, whose contractor does the work, whether the JMB is involved, and whether the fix happens in your unit or someone else’s. Misdiagnosing the scenario is how owners end up paying for repairs that were never theirs to fund — or repairing the wrong side of the slab entirely.
| Scenario | Typical tell | Usual payer | First move |
|---|---|---|---|
| 1. Your bathroom leaks into the unit below | Downstairs neighbour or management complains; stains on their ceiling | You | Verify the source; quote both injection & re-waterproof routes |
| 2. Upstairs leaks into your unit | Rings or drips on your ceiling, worse after their shower hours | Upstairs owner (s.142 presumption) | Notify management in writing; document with photos |
| 3. Your balcony leaks | Stains inside the adjacent room, ponding after rain | Usually you (check your DMC) | Falls, drainage & membrane inspection |
| 4. External wall / roof / common property | Stains after rain on external-facing walls, top-floor ceilings | JMB/MC (maintenance fund) | Written complaint to management office |
The sections below walk each scenario, then the money questions: approvals, deposits, access and cost.
The knock on the door from a downstairs neighbour — or a letter from management — usually starts this one. Under Malaysian strata law the presumption is that inter-floor leakage originates from the parcel above, so once the inspection traces it to your bathroom, the repair is yours to fund. You then have two honest routes: seal the water path in the slab from below via PU injection (fast, no hacking, done from the neighbour’s side with their consent), or re-waterproof your bathroom floor from above — non-hacking chemical/coating systems at RM1,500–RM3,500, or hacking and full membrane replacement at RM4,500–RM9,000 (indicative 2026, Klang Valley). Which route is right depends on the slab condition and how far the old membrane has failed — our bathroom waterproofing guide covers the decision in detail. Move quickly: a documented, cooperative repair keeps this a plumbing matter instead of a tribunal claim.
The mirror image, and the single most common condo dispute in Malaysia. Stains, rings or drips on your ceiling that track the upstairs unit’s bathroom or shower hours point up. Section 142 of the Strata Management Act 2013 presumes the leak comes from the parcel above unless proven otherwise — a presumption that exists precisely because upstairs owners so often deny responsibility. Your play is procedural, not confrontational: photograph and date everything, notify the management office in writing, and request the inspection that produces Form 28 findings on the source. We keep this summary short because the full playbook — timelines, forms, and what to do when the neighbour stonewalls — lives in our inter-floor leakage guide and upstairs bathroom leak guide, with escalation covered in the strata tribunal guide.
Balconies live outdoors: UV, thermal cycling, driving rain and blocked drains kill their membranes years before bathroom membranes fail. The tell is water staining or bubbling paint inside the room adjacent to the balcony, or ponding that sits after rain. Responsibility is the subtle part — balconies are typically within your parcel boundary (making the waterproofing yours to maintain), but some development DMCs treat balcony slabs or external surfaces differently, so check your house rules before assuming either way. The repair itself follows the standard outdoor sequence: correct the falls and drainage first, then a flexible exposed-grade or tiled-over membrane at roughly RM6–RM18 per sq ft. Full detail, including the drainage-first rule and membrane choices, is in our balcony waterproofing guide.
Water arriving through an external-facing wall, a top-floor ceiling below the roof, a corridor wall or around a façade joint is a different legal animal: those elements are common property, maintained by the JMB or MC out of the maintenance fund you already pay into. You should not be funding façade repairs, roof membranes or lift pit waterproofing individually — your job is a written complaint with photos to the management office, followed up persistently, with the strata tribunal as the backstop for a JMB that will not act. The trap to avoid: paying your own contractor to “just fix” a common-property leak from inside your unit. It rarely works (the water path is outside), and it muddies the responsibility trail. Diagnose first, then put the repair on the right party’s bill.
The quick reference — with the caveat that your development’s DMC and house rules can shift boundary details, so always check them before a dispute hardens.
| Leak source | Who usually pays | Basis |
|---|---|---|
| Your bathroom / wet area floor | You | Defect within your parcel |
| Slab leak from the unit above | Upstairs owner | s.142 SMA 2013 presumption — from above unless proven otherwise |
| Your balcony floor | Usually you | Parcel boundary — confirm in your DMC |
| External walls, roof, corridors, lift pits | JMB / MC | Common property, maintenance fund |
| Concealed shared pipes in the slab | Often JMB / MC | Frequently common property — check the DMC |
When the source is genuinely uncertain, push for a joint inspection before anyone spends money — a proper trace (dye test, moisture mapping, isolation tests) is far cheaper than repairing the wrong element. The inter-floor leakage guide explains how the formal process assigns responsibility when neighbours disagree.
Re-waterproofing your own bathroom counts as wet works, and virtually every Klang Valley condo requires a renovation application before hacking starts: an application form, your contractor’s details and workers’ particulars, a works schedule, and a refundable renovation deposit — commonly RM500–RM5,000 depending on the development, plus rules on working hours, lift protection and debris disposal. Non-hacking repairs (PU injection, surface-applied coatings) often need only a simple notification rather than the full deposit process, which is one more quiet advantage of the non-destructive routes. Budget the approval lead time — typically a few days to two weeks — into your programme, and if you are re-doing the whole bathroom while you are at it, our condo renovation cost guide covers the wider numbers and rules.
Here is the part no contractor’s quotation mentions: in scenarios 1 and 2, the repair usually happens in somebody else’s home. Injection from below means our technicians working on your downstairs neighbour’s ceiling; proving an upstairs leak means entering the unit above. Access is granted by people, not by law alone — so start polite and early. Introduce the problem with photos, propose specific dates, keep works short and clean, and put the neighbour’s schedule first; a box of pastries has unlocked more Malaysian ceilings than any legal letter. When goodwill fails, the SMA does provide access mechanisms through the management body, and persistent refusal can be taken to the strata management tribunal — but treat that as the last resort. A repair done amid a neighbour war costs more, takes longer and poisons the building politics you both still have to live inside.
For the classic condo ceiling leak, the game-changer is that the slab can very often be sealed from the underside — no hacking, no destroyed bathroom upstairs, no week of noise. PU injection pumps expanding polyurethane resin into the slab’s cracks and water paths through small ports drilled from below; the resin chases the water, foams, and seals the path shut. ClickBina charges a flat RM650 per bathroom ceiling with a 6-month no-leak warranty — against the market norm of RM80–RM250 per injection point, where a typical ceiling needs several points and the bill only becomes clear after drilling starts. Flat means flat. Injection is the right tool when the slab itself is passing water; it is not the fix for failed pipe joints or a bathroom whose entire membrane is gone — an honest assessment comes first, and our PU injection guide covers exactly when it works and when it does not.
Planning figures for the usual condo repairs (indicative 2026, Klang Valley):
| Repair | Indicative cost | Notes |
|---|---|---|
| PU injection, bathroom ceiling (from below) | RM650 flat (ClickBina) | 6-month no-leak warranty; market norm RM80–RM250/point |
| Non-hacking bathroom re-waterproof | RM1,500 – RM3,500 | Coating/chemical systems over existing tiles |
| Hack & full membrane replacement | RM4,500 – RM9,000 | Includes hacking, membrane, ponding test, re-tiling |
| Balcony membrane | RM6 – RM18 / sq ft | After falls & drainage are corrected |
| Leak tracing / joint inspection support | Modest — often credited into the repair | Cheaper than repairing the wrong element |
Two warnings from real cases. First, per-point injection quotes that look cheap multiply after drilling starts — always get the all-in number in writing. Second, the cheapest re-waterproofing quote in a condo is the riskiest, because a failed redo does not just cost you twice: it restarts the dispute with the neighbour underneath. Our guides on why waterproofing fails and warranties show what separates a lasting repair from a repeat performance.
Condo leak work is half technical, half procedural — and ClickBina handles both across the Klang Valley. We diagnose the scenario before quoting, so the right party pays; we produce the written findings, photos and reports that management offices and tribunal filings actually need; we handle renovation-application paperwork and deposits with your JMB; and we work clean and fast in neighbour units, because we know access is a favour. The fixes themselves are honestly matched to the problem: RM650 flat-rate PU injection with a 6-month no-leak warranty where the slab is the path, non-hacking re-waterproofing at RM1,500–RM3,500 where the membrane can be renewed from above, and full hack-and-redo at RM4,500–RM9,000 where nothing less will last. Living in an older walk-up instead? The economics change — see our apartment & flat waterproofing guide. Not sure which scenario you are in? WhatsApp us ceiling photos and your block layout — the assessment is free, and catching it at the early-signs stage is the cheapest outcome of all.
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