Kitchen Ceiling Drip

Hi, yes, the bathroom or separate toilet above the kitchen is a likely source, but not always the exact point of the leak. If the drip started as soon as you turned the mains water on, I would first suspect a pressurised pipe, toilet fill connection, or tap feed rather than a bath or shower waste. Waste leaks usually occur only when the fitting is in use. The safest step is to turn the mains off again, then check the upstairs toilet, basin, bath and visible pipework carefully, and test each fitting one at a time. For leak tracing and plumbing repairs in Hull and surrounding areas, contact HJZ Plumbing.

Yes.Failed compression joint on basin, toilet, or bath
Cracked plastic pipe or push-fit fitting
Loose or damaged isolation valve
Old flexi hose split
Shower valve connection

The pipe work would need to be retested if not visible, but my guess would be a mains connection to an appliance in the bath room which would be needed to tightened

I would suspect the leak to be traced to either the bath sink or toilet but also any pipes in these areas are suspect.

Most likely it is, need to check the bathroom for any leaks.

most likely yes, the leak is almost certainly coming from one of the plumbing fixtures directly above the kitchen. When you turned the mains back on and water started flowing through the upstairs bathroom/toilet pipes again, any failed seal, loose connection, cracked waste pipe, or leaking supply pipe would begin dripping and show up on the ceiling below. Common culprits are a leaking toilet inlet/outlet seal, loose basin waste, shower tray seal failure, or a pipe joint under the bath panel.

remove the bath panel (if accessible), and check around and underneath each fixture for moisture while turning the water on and off. If the ceiling is actively dripping, avoid using any upstairs water until it's located and repaired, otherwise the ceiling could sag or collapse.

A drip from the kitchen ceiling after turning on the mains usually means there’s an active leak from pipework or fittings in the bathroom above — it could be from the toilet supply, bath waste, or a loose connection under the basin or shower. The exact source can’t be confirmed without inspection, but yes, it’s very likely coming from one of those upstairs fixtures.
The safest step is to turn the water back off at the mains and avoid using the bathroom until it’s checked. A plumber can carry out a moisture test and trace the leak without unnecessary damage to the ceiling. Acting quickly can help prevent structural or electrical issues.
— Fixzer Plumbing