Low Water Pressure at Home: Causes and What to Check

Weak flow from taps and showers? Common causes of low water pressure at home, simple checks and when to book a plumber. Call 020 8050 9933.

Key facts

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Low water pressure can be caused by something simple, like a partly closed valve, or by a leak or blocked pipe. These checks help narrow it down.

Is it one tap or the whole house?

If only one tap or shower is weak, the cause is likely a blocked aerator, showerhead or cartridge. Unscrew and soak it in a descaler or vinegar solution, then rinse and refit.

Check the stopcock and isolation valves

A stopcock or valve that is not fully open can reduce flow. Open the main stopcock fully, and check the small isolation valves under sinks and near appliances.

Ask your neighbours and water company

If neighbours have the same problem, it may be a supply issue. Check your water company's website or helpline for local works or faults.

Leaks and blocked pipes

A hidden leak can reduce pressure at taps, and so can scale or corrosion inside older pipes. Falling pressure combined with damp patches or a high water bill is a sign to book a leak check.

Pressure regulators and boilers

A faulty pressure reducing valve can cause low flow throughout the home. A combi boiler also needs good mains pressure to provide hot water. An engineer can test pressure and flow.

Quick tips

Related help

Common questions

Can you find a hidden leak?

Yes. A leak detection survey is typically £80 - £150 including VAT, plus the call-out fee.

Is low pressure an emergency?

Not usually, but if you see water leaking or have no water at all, call us. We take bookings 24 hours a day, 7 days a week.

How much does a tap repair cost?

Tap repair is typically £50 - £80 including VAT, plus the call-out fee.

Call 020 8050 9933