Water Coming Through the Ceiling: What to Do First

Before anything else, look at the ceiling itself. A brown stain spreading slowly is one thing, but a section that is sagging, bulging or dripping is holding a pool of water above it, and a wet plaster ceiling can come down without warning. In the older homes around Toorak and Stonnington this matters even more, because Edwardian and Victorian lath-and-plaster ceilings are heavy and fail suddenly when they let go. Clear everyone out from underneath, move furniture and valuables clear, and put a bucket down to catch the drips.

People sometimes ask whether to poke a small hole to let the water drain in a controlled way rather than have the whole ceiling collapse. It can relieve the weight, but only do it if you genuinely understand the risk, are on stable footing well to the side, and have switched off the power to that area first. If you are not confident, stay clear and wait. A stained or replaced ceiling is a much smaller problem than an injury.

If the leak is coming from a plumbing fixture above, turning the water off at the meter stops it. The meter is usually near the front boundary in most local homes. One quick test tells you a lot about the source: does the water only appear when it rains, or when someone uses water upstairs, or is it constant regardless? If it only shows up during or after rain, the problem is almost certainly the roof, flashing or gutters rather than plumbing, and we will tell you that honestly and point you to a roofer rather than charge you for the wrong trade.

If it appears when a bathroom, kitchen or laundry above is used, or it runs constantly, it is plumbing: a leaking pipe in the ceiling space, a failed shower base or waterproofing membrane, or a burst flexible hose. Note what was happening when it started, because that detail helps us bring the right approach and find the source faster.

Ceiling spaces are full of wiring, and modern downlights sit right in the path of a ceiling leak. If water is anywhere near light fittings, downlights or wiring, switch off the affected circuits at the switchboard, and if you are not sure which they are, turn off the main switch. Do not operate switches or touch light fittings that are wet, and do not stand in pooled water while working at the board.

Water tracking across a ceiling and out through a light fitting is one of the more common ways a leak becomes an electrical hazard, so this step is not optional if the leak is near any fitting. Losing power to part of the house for a while is a minor inconvenience next to the alternative. The same first-response steps apply here as with any burst, and our burst pipe first response guide walks through them in order.

Once the water is under control and the electrics are safe, photograph everything before you start mopping. Insurers assess water damage claims on evidence captured before the cleanup, so get the ceiling stain or damage, any water on the floor, affected furniture and flooring, and the source if you can see it. A short video showing water actively dripping is worth keeping too.

Then start limiting the damage: soak up standing water, lift rugs off wet floors, and get air moving through the room. Timber floors and plaster generally recover if they dry quickly, so the first hour of mopping and ventilation makes a real difference to what has to be replaced later.

A lot of the ceiling leaks we attend are in two-storey period homes and renovated terraces where a bathroom, ensuite or laundry sits above a living area. The usual culprits are ageing shower waterproofing that has finally given way, a cracked shower base, a failed seal around a floor waste, or a corroded pipe or old flexible hose running through the ceiling cavity. In homes with original pipework, a pinhole leak in a copper line can weep into a ceiling for weeks before it shows as a stain.

Because water runs along the top of plasterboard and down joists, the wet patch on your ceiling is often not directly under the leak. It can appear a metre or more away from where the water actually enters, which is exactly why guessing and cutting a hole in the wrong spot wastes time and money.

Our job is to find the actual source rather than patch the symptom. We follow the water back from where it shows, use access points and, where needed, a minimal inspection opening rather than tearing out a whole ceiling, and confirm whether it is supply pipework, waste, shower waterproofing or something outside our trade like the roof. Once we know, you get a fixed price for the repair before it starts.

Where the leak has soaked structure or plaster, we make it safe and watertight and are honest about what needs drying time before it can be closed up and made good. Ceiling and waterproofing leaks often sit alongside burst pipe repairs, so if you want to understand the pipework side first, our burst pipe and emergency plumbing pages cover how we handle urgent water jobs.