Bathroom Leak: How to Find the Source and When to Call a Plumber
A bathroom leak does not always show where it starts. You may see water on the floor while the source is a fitting behind the basin, the seal under the toilet or a joint inside the wall. The sooner you find it, the simpler the repair and the lower the risk of damage to tiles, walls and the ceiling below.
Where do bathroom leaks usually start?
Under the basin
The trap, flexible hoses and isolation valves are the most common drip points, usually from a worn washer, a loose joint or an old flexible hose.
Around the toilet
Water around the base of the toilet may mean the seal between the toilet and the drain has failed, or there is a drip from the fill hose or the cistern.
Mixer taps and shower
A tap or shower that keeps dripping after it is closed usually has a worn cartridge or washer. Damp behind the mixer on the wall can point to a joint inside the wall.
Shower floor and bathtub
Cracked grout or silicone around the tray or bath lets water seep under the tiles, which later shows as damp in the next room or on the ceiling below.
Simple steps to find the source
- Dry the area completely, then watch where water appears first.
- Check the trap and fittings under the basin with your hand or a dry tissue.
- Close all taps and watch the water meter. If it keeps moving, there is a leak somewhere.
- Note whether water appears only when the shower is used, when draining, or all the time.
- Take photos of the damp or drip; they help the plumber plan the repair.
If the leak is heavy, close the bathroom or main water valve until a technician arrives. If water is near a socket or appliance, switch off the bathroom circuit at the panel before going near it.
When do you need a plumber?
- The leak continues after tightening the visible fitting.
- Damp on the wall or on the ceiling below the bathroom.
- The water meter moves with all taps closed.
- A sewage smell or dirty water around the toilet.
- The mixer keeps dripping after a washer change.
A plumber checks the visible fittings first and tells you whether the repair can be done on the same visit or needs limited opening, explaining why before any work. See our pipe and leak repair and bathroom plumbing and fixtures services.
What affects the cost of a bathroom leak repair?
It depends on where the leak is, whether it is in a visible fitting or inside a wall or floor, and whether a new part is needed, such as a mixer, hose or toilet seal. We explain this after inspecting and before starting.
Frequently asked questions
Can a bathroom leak be fixed without breaking tiles?
Many leaks are in visible fittings and are fixed without any breaking. A leak inside a wall or under tiles may need limited opening, and we explain why before doing anything.
Why is there damp on the ceiling downstairs?
Usually a leak from the bathroom floor, toilet or bath on the floor above. Checking it early limits the damage.
Will silicone fix it?
It helps if water is getting through the joints around a bath or shower, but it will not fix a leaking pipe or fitting.
Need a plumber in Riyadh?
Send a photo of the leak and your district. We work Saturday to Thursday, 6:30 AM to 11:30 PM, and Friday, 2:00 PM to 11:30 PM.