Record when it happens
Note whether the symptom is constant or intermittent, which fixtures are affected and whether it changes when other water outlets are used. Timing and distribution often provide more useful evidence than the symptom alone.
Check the local-versus-system pattern
Compare nearby fixtures where it is safe and practical. A fault affecting one outlet usually follows a different investigation path from a symptom affecting an entire bathroom, hot-water system or property.
What a plumber needs to know
Send the location, a concise symptom description, any recent work to the same area and clear photos or video where useful. Avoid dismantling pressurised fittings or concealed services simply to obtain more information.
Related information
Low Hot-Water Pressure
Low pressure on the hot side only can point to restrictions or components in the hot-water system rather than the incoming supply.
Low Water Pressure: A Practical Checklist
Pressure complaints are easier to diagnose when you first determine whether the problem affects one outlet, one zone or the whole property.
Water Pressure Changes During the Day
Pressure that varies by time can reflect supply conditions, demand, controls or system restrictions and should be measured before changes are specified.
Water Pressure Problems
Low or unstable pressure can result from supply conditions, restrictions, valves, filters, pumps, regulators, leaks or pipe sizing. The correct solution starts by identifying where pressure is being lost.