First 24 hours: what to do
If water is dripping or a stain is spreading on your ceiling, act in this order:
- Protect the room. Move furniture and electronics away, put a bucket or towel under drips and switch off any ceiling lights or fans near the wet patch.
- Take photos and videos of the stain with a date — you will need them for the management and the neighbour above.
- Tell the owner or tenant above. Ask them to avoid using the shower area until the source is found.
- Notify your building management in writing (email or the management app, not only a phone call). Include your unit number, photos and when it started.
Who is responsible under the strata rules?
For stratified buildings in Peninsular Malaysia, inter-floor leaks are covered by the Strata Management (Maintenance and Management) Regulations 2015:
- Once you give written notice, the JMB or MC must inspect within 7 days to find the cause.
- They then issue a certificate of inspection stating the cause and who must repair it — usually the owner of the unit above if the leak comes from their bathroom, or the management if it comes from common property such as a shared pipe.
- The responsible party must start the repair promptly once they receive the certificate. If they don’t, the management can carry out the repair and recover the cost from them.
- If you disagree with the finding, the matter can be referred to the Commissioner of Buildings (COB) — for Kuala Lumpur that is under DBKL — and disputes can go to the Strata Management Tribunal.
If your building is still within the developer’s defect liability period, report the leak to the developer first.
This is general information to help you understand the process, not legal advice.
Finding the real source
A stain under a bathroom does not always mean the waterproofing has failed. Before anyone hacks tiles, the usual suspects are checked in order:
| Possible source | How it shows up | Typical fix |
|---|---|---|
| Leaking pipe joint or concealed pipe | Leak continues even when the shower is not used | Plumbing repair, small opening |
| Cracked or loose floor trap | Stain directly below the trap position | Replace/reseal the floor trap |
| Toilet bowl seal | Stain under the toilet, worse after flushing | Remove and reseal the toilet |
| Failed grout or sealant | Leak only after showers, near wall joints | Regrout and seal |
| Failed membrane under tiles | Leak after showers across the wet area | Hack, re-waterproof, flood test, retile |
Simple tests narrow it down: running water only in the shower area, then only down the floor trap, then flushing the toilet — while someone watches the ceiling below. Moisture readings and a coloured-water test help confirm which zone is leaking.
What a proper waterproofing repair looks like
When the membrane itself has failed, a lasting repair follows these steps:
- Hack the tiles and screed in the wet area down to the concrete slab.
- Prepare the surface: clean, repair cracks, round off the floor-to-wall corners.
- Prime and reinforce — fabric reinforcement at corners, pipe penetrations and around the floor trap, where most failures start.
- Apply the membrane in two coats, running up the walls (typically 150–300 mm, higher in the shower zone).
- Flood test — fill the floor with 5–10 cm of water for 24–48 hours and check the ceiling below stays dry.
- Screed and retile with the correct fall to the floor trap.
Expect the bathroom to be out of use for about 3–5 working days. See our waterproofing service for what is included.
Why injection-only “no hacking” fixes often come back
You may be offered a quick fix: injecting resin into the ceiling slab from the unit below, for a price per point and with no hacking. It can stop drips for a while, but if the water source above is still there, water simply finds a new path and the stain returns — often within a few months. Injection has a place (for example, sealing an active crack after the source has been fixed), but it should not replace finding and fixing the source.
How much does it cost in KL?
| Job | Typical price |
|---|---|
| Leak inspection & diagnosis | RM100 – RM300 |
| Reseal toilet bowl or replace floor trap | RM150 – RM450 |
| Regrout & seal a wet area (no hacking) | RM300 – RM900 |
| Full bathroom floor re-waterproofing (hack, membrane, retile) | RM1,800 – RM4,500 |
| Repaint the ceiling stain below (after it dries) | RM150 – RM400 |
Prices depend on the bathroom size, tile choice and access — see the full price guide.
Checklist before you agree to a repair
- Has the contractor explained where the water comes from, and how they know?
- Does the quote include reinforcement at corners and drains, and a flood test before tiling?
- Are hacking, debris disposal and new tiles listed clearly?
- Have you told the management the dates and the contractor’s details (many buildings require registration)?
Frequently asked questions
Who pays for a leak from the unit above in a KL condo?
Usually the owner of the unit where the leak originates. Under the Strata Management (Maintenance and Management) Regulations 2015, the JMB or MC inspects after written notice and issues a certificate stating the cause and the party responsible for the repair. If the source is common property, the management is responsible.
How long does the management have to inspect an inter-floor leak?
Seven days from the written notice, under the 2015 strata regulations for Peninsular Malaysia. Send your notice in writing with photos so the date is clear.
Can a leak be fixed without hacking the bathroom tiles?
Sometimes — if the source is a pipe joint, floor trap, toilet seal or failed grout. If the membrane under the tiles has failed, a lasting repair requires removing the tiles in the wet area and re-waterproofing.
How long should I wait before repainting the stained ceiling?
Until the leak is fixed and the ceiling has fully dried, which can take a few days to a couple of weeks. Then use a stain-blocking primer before the topcoat so the mark does not bleed through.
Written by the Wanisa Renovations team in Kuala Lumpur, based on our day-to-day work in KL homes. Prices are guide ranges; your quote is confirmed before work starts.