Low water pressure from one tap only
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Most likely cause & what to check
First check if the problem is hot, cold, or both. Hot only suggests a different cause (boiler or cylinder) to cold only (blockage or valve).
Check the isolation valve under the sink — it should be turned fully open (slot in line with the pipe). A partially closed valve causes low flow from that tap only.
Unscrew the aerator at the tip of the tap spout — this is the small mesh filter that screws off by hand or with pliers wrapped in a cloth. Rinse it under a running tap and scrub with a toothbrush to remove limescale.
If the aerator is heavily scaled, soak it in white vinegar for 30 minutes then rinse.
Refit the aerator and test the flow. If it's still poor, the cartridge or supply pipework may be partially blocked — call a plumber.
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Frequently asked questions
Do all taps have aerators?
Most modern mixer taps do. Older pillar taps (separate hot and cold) often do not. If you can't see a mesh at the end of the spout, your tap may not have one.