Know what can be isolated before opening an enclosure
Work around sinks, appliances and electrical accessories should begin with clarity about the relevant water or power isolation. A handyman must not guess which unlabelled valve or circuit controls the area. Ask the owner or manager for known locations and report missing labels rather than making unsupported assumptions. If a cupboard hides several valves, a simple non-permanent label can help future occupants, provided its function is confirmed. Gas controls and regulated electrical work belong with qualified trades. The same principle applies in communal systems: an internal symptom may involve a riser or supply controlled by the building. Confirm responsibility before removing boxing or disconnecting anything that could affect another flat.

