**Check for a Blocked Aerator or Showerhead** Mineral deposits from hard water can clog aerators and showerheads. Unscrew and soak them in vinegar overnight to dissolve limescale. This is the easiest fix. If pressure improves, you've solved it. For persistent blockages, consider a water softener to reduce sediment buildup throughout your system.
**Inspect the Stopcock and Isolation Valves** A partially closed stopcock restricts flow. Ensure it's fully open. Also check valves under sinks and behind toilets – they may be accidentally turned. If you have a combi boiler, check the mains pressure gauge. Low pressure could indicate a leak or faulty expansion vessel. Bleeding radiators can also affect system pressure.
**Look for Leaks or Corrosion** A hidden leak can reduce pressure. Listen for dripping sounds and check for damp patches. Corrosion inside old pipes (especially galvanised steel) narrows the bore, reducing flow. If you have an older home, repiping may be necessary. Limescale buildup in pipes also restricts flow; descaling solutions can help temporarily.
**When to Call a Professional** If you've tried these steps and pressure is still low, there may be a mains supply issue or a problem with your boiler or water heater. A plumber can perform a pressure test and diagnose the cause. For sudden drops, an emergency plumber should check for a burst pipe. Don't ignore low pressure – it often signals bigger problems like sediment buildup in your water heater.