The ceiling stain that is a heater or an aircon, not the slab

Last updated 31 October 2026. Prices below are bands already printed on HomeySG. This page is not legal advice.

False ceilings in Singapore bathrooms and utility yards exist so a storage heater and a bundle of pipes can sit out of sight. They also hide the first litre. A tank that has rusted through, a pressure-relief valve that is dripping, a joint on the inlet, or a condensate line that has come apart will wet the plasterboard long before the slab is involved. The stain on the ceiling of the room below, or on the board itself, gets called a waterproofing failure because that is the expensive word. Test the appliances before you buy the word.

The heater test is a valve. Close the inlet to the heater and leave the bathroom unused. If the active drip slows and the tray stops filling, you have found the branch. A tank that is wet on its own skin, with rust at a seam, is not a joint you tighten. The steel has failed. Replacement is the repair. An instant heater that leaks at the inlet union is a joint. Instant-heater labour on the water-heater page is S$108 to S$260. A like-for-like instant unit on a sound 20A point is S$180 to S$450 on the heater guide. Exposed storage-heater labour, 15L to 50L, is S$188 to S$380. A 15 to 30 litre storage change is S$450 to S$900. Read the sentence that matches the photo. A different capacity, a gas heater, or a tank you cannot see yet is quote on inspection. We do not publish a repair for a rusted shell. The shell is finished.

Condos hide these heaters above the ceiling, which is why the ceiling page sells a hinged aluminium hatch, 300mm to 600mm, at S$180 to S$350. The next leak or the next anode, if your model has one you are willing to service, needs that door. A hole-saw cut taped over is how the ceiling was opened last time. Replacing a rotten board is S$250 to S$650, and re-anchoring a sagging L-box is S$220 to S$450, both after the water has stopped. Opening the ceiling while the tank is still raining is how the new board stains before you leave the car park.

Aircon water is colder and usually clearer, and it follows the hours the compressor runs. A choked drain, a split insulation on the copper so the pipe sweats, or a tray that overflows at the indoor unit will mark a ceiling in a line or a circle near the trunking, not always under the bathroom. Switch the aircon off for a day. If the drip pauses and returns when you switch it on, you have the answer. Do not pond the bathroom floor on the same day or you will not know which test worked. Insulation sweat is not a membrane and not a PUB pipe. Trunking that has to be opened is the aircon-trunking page if that is the scope you actually want. A drain that needs a vacuum is a small job. A drain that was piped into a bathroom floor and left to drip on the membrane for years can destroy the membrane. Then you have both problems, in that order: stop the drip, then test the floor.

Supply water and heater water both can move the story onto the meter. If the heater inlet is open and the meter moves with every tap shut, the leak is under pressure and may be the heater or the pipe feeding it. Shut the heater valve and repeat the photos. PUB’s leaflet is the underlying check: fittings and pumps off, dial still running, there may be a leak. A licensed plumber takes a concealed supply. The heater trade takes a tank on an existing point. Do not swap them.

Electrical safety sits beside the tray. Storage and instant heaters are on isolators for a reason. If the ceiling board above a light is dripping, or the isolator itself is wet, stop and isolate the circuit. Do not keep resetting a device that trips as soon as the heater calls for heat. If you cannot make that safe, 995. A dry stain the next week is the repaint, S$150 to S$400, not an emergency. Gas heaters are outside these electric bands. If you smell gas, leave the gas question to a licensed gas worker and do not treat it as a silicone job.

Neighbours still matter. A heater in your ceiling that drips into your own bathroom is yours. A heater or an aircon that drips through the slab into the flat below is an inter-floor leak with a known appliance, which is a kinder argument than a mysterious membrane, and it is still their ceiling. Tell them. In an HDB flat, do not assume the goodwill scheme covers an appliance. The scheme letter is about the slab and it excludes personal fittings. In a condo, tell the MCST if the drain crosses common property, and tell the neighbour if it is your unit. The window is unrelated unless the stain is at the frame. Keep that booking separate.

Homey Furnishing Pte. Ltd. (ACRA UEN 202018148K), 27 Mandai Estate, #06-10 Innovation Place, Singapore 729931, invoices permit-exempt leak checks, regrouting, silicone, and making-good after the water has stopped. V On Construction Pte. Ltd. (ACRA UEN 201611708H), on the HDB Directory of Renovation Contractors, invoices an HDB renovation permit when bathroom finishes are hacked or a new membrane is laid under new tiles. A concealed or new water-supply pipe is a PUB licensed plumber. Homey Furnishing is not that plumber and does not publish a waterproofing warranty term.

Curtains, blinds and roller shades are not part of this booking. Fabric window treatments are a different product, and these pages do not quote them.

One appliance per day. The bathroom stays dry while you test the machine, and the machine stays off while you pond the floor.

1. Look for a tray, a relief pipe, and a wet union before you look at the tiles. A torch through the existing hatch is enough.
2. Shut the heater inlet. Wait. Photograph the tray.
3. The next day, run the aircon and watch. The day after, leave it off.
4. Only then pond the bathroom if the stain is still unexplained.
5. Fit a hatch if the only access is a taped hole. The band is S$180 to S$350.

Heaters in false ceilings are a condo habit and a landed habit. HDB flats more often have a heater you can see. The test is the same.

A pressure-relief valve that drips when the tank heats is telling you about pressure or a failed seat. Exercising it once, if you can do that without spraying a live fitting, is a check. Replacing the heater because the valve dripped once is the expensive reading. A union that is wet only at the thread is a joint. A tank that is wet in the middle of a panel is a failed vessel. Say which of the three the photo shows. An aircon pipe that sweats will wet the insulation and then the ceiling in a line along the trunking. The fix is insulation and a drain that falls the right way, not a bathroom membrane and not a bead of silicone along the trunking cover.

Sloppy heater work leaves the tray unpiped, so the next drip goes back into the ceiling, and leaves no hatch, so the next technician cuts again. Sloppy aircon work terminates a drain onto a balcony waterproofing detail and walks away. The balcony page is what that drip destroys. Point the drain at a floor trap that can take it, not at a scupper you have just sealed.

If you can switch it off and the water stops, it is not the concrete.

Ask these before a heater is condemned or a floor is hacked.

1. Did anyone shut the inlet and watch the tray?
2. Did anyone switch the aircon off for a day?
3. Is the tank wet on a seam, or only at a union?
4. Which published band is the unit: instant labour, like-for-like instant, or the storage sizes on the heater pages?
5. Will you leave a hatch, and is it the S$180 to S$350 sentence?
6. If it is none of those, say quote on inspection. Do not borrow the bathroom membrane price.

Water at the isolator or the light is the stop. Isolate. Call 995 if you cannot make the area safe. A neighbour’s ceiling that is dripping because of your heater is a conversation you should start the same day, with the photos. HDB’s scheme is a poor fit for an appliance. Say what the appliance test showed so nobody applies the wrong letter.

A condo drain on a common ledge is an MCST email, not a secret repair from a chair on the ledge. Nobody leans over a railing to reseat a drain. Window leaks stay on the window page.

How you're charged

A leak or waterproofing job that already has a sentence on HomeySG uses that sentence. Nothing in this table is a fuel surcharge, and the handyman hour is not added on top of a band unless the written scope says so. A membrane, a balcony, a planter, a roof, an epoxy-grout system, or a listening survey with no matching row is quote on inspection.

Who is allowed to do the work

HDB’s renovation pages split a coat of silicone from a hacked bathroom. Replacing toilet wall and floor finishes is not allowed for 3 years from the completion date of the block, because a membrane sits on the screed. After that, a replacement uses pre-packed waterproofing screed, a membrane upturned at least 150mm at walls, kerbs and pipes, a UPVC floor-trap grating with a long collar, and a water test. Fines for unauthorised work are already written on the permit guide as up to S$5,000. Homey Furnishing does not sign the permit invoice.

• Regrout, a silicone zone, hollow-tile injection and a stain repaint after the water has stopped stay on the published rows. They do not replace a membrane.
• Opening the bathroom floor or wall finishes is V On Construction when the flat is HDB and the work needs a permit.
• PUB’s leak leaflet says it is an offence under the Public Utilities Act to engage an unlicensed worker for plumbing work. A concealed or new supply pipe is a licensed plumber. An exposed trap is a different visit.
• External walls of an HDB block are common property. The town council on the S&CC bill is the first report, not a private injector.
• SCDF does not allow hacking of household-shelter walls, floor slabs or ceiling slabs to chase a pipe. The leak is found another way.
• A window-frame leak is the window sealant page. Exterior rivets and stays stay with a BCA approved window contractor.
• Curtains, blinds and roller shades are not quoted here.

Ways to keep the bill smaller

• Photograph the stain, the wet room, and the water meter before anyone hacks. A hack that destroys the evidence is a second problem.
• Run one test at a time. Shower, flush, aircon and rain on the same afternoon make a useless log.
• If the joint is only mouldy silicone, the published zone is S$80 to S$150. That is not a membrane.
• If the ceiling is already dry and the source is fixed, the hairline repaint is S$150 to S$400. Paint on a live leak is how the stain returns.
• Look through the hatch you already have before you book a membrane. A wet tray ends the mystery.

WhatsApp the photos to +65 8561 0630.

Use the row that names the appliance. A tank size or a gas heater that is not listed is quote on inspection.

Anything not in that table is quote on inspection.

WhatsApp the photos to +65 8561 0630. The reply uses a band already printed on HomeySG, or it says quote on inspection.

Official pages, not a legal opinion

The appliance bands are already printed on the heater and ceiling pages. HDB’s scheme letter is listed so an appliance leak is not forced into it.

• PUB leak leaflet. A moving meter means supply pressure, which includes a heater inlet left open.
• HDB goodwill letter. Personal fittings are outside the scheme. A heater is a fitting.
• HDB ceiling leaks. If the appliance test is negative, go back to the slab process.
• SCDF shelter. Do not open a shelter ceiling to reach a heater.
• HDB building works. A window-frame drip is not a heater repair. Exterior window parts stay with an approved window contractor.

• Concealed heater replacement
• Hatches and ceiling boards
• Heater access calculator
• Aircon trunking
• If the appliances are innocent
• False ceilings