Low Water Pressure Throughout the Whole House
Check the steps below first — if you're not confident, get it fixed safely today.
Post a job — we'll find you an engineer →Low water pressure throughout your entire house is frustrating, but the good news is that it's usually straightforward to diagnose. When every tap and appliance is affected — from the kitchen tap to the shower and washing machine — the fault typically lies either with the mains supply arriving at your property, or with something blocking it once it enters your home. This problem is surprisingly common, particularly in older properties, rural areas served by narrower pipes, or during periods of high demand. This guide walks you through the practical checks you can do yourself, from examining your main stopcock to consulting neighbours and your water company, and explains when to call in a qualified plumber. If you discover the mains pressure itself is too low, that's your water company's responsibility — but if it's something within your property, there are straightforward fixes available.
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Most likely cause & what to check
If low pressure affects every tap and appliance throughout the house, start at the mains. Check the main stopcock (usually under the kitchen sink or where the water pipe enters the property) — it should be fully open (handle inline with the pipe).
Check with your neighbours — if they have the same problem, there may be a burst main or work being carried out by your water company. Call your water company's supply interruption line to check.
Check whether the problem is limited to cold water only, or both hot and cold. If only hot water pressure is low, the issue is likely in the hot water system (cylinder, pump, or scale).
If you have a water meter, check whether it is showing any flow when all taps are off — this could indicate a leak on the supply pipe between the meter and your property.
Partially closed or corroded stopcocks are a common cause — the internal mechanism can deteriorate over decades. Try turning the stopcock fully off and back on to clear any partial obstruction. If it's old and stiff, do not force it — call a plumber.
Have the mains pressure checked at the boundary stopcock. UK regulations require mains pressure of at least 1 bar (10 metres head) at the point of use. If it is below this, contact your water company as this is their responsibility.
In areas served by old lead or narrow iron mains pipes, pressure is often chronically low. A booster pump can be fitted to improve pressure within the property — typically £200–500 installed.
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Frequently asked questions
Could low pressure in my whole house be caused by a leak?
Yes, a leak on the supply pipe between your water meter and property can reduce pressure noticeably. Check your water meter when all taps are off — if it's showing a flow reading, you likely have a leak. Contact your water company immediately, as the supply pipe up to your boundary stopcock is their responsibility to repair.
My main stopcock is very stiff — should I force it open?
No, do not force an old or corroded stopcock as you risk damaging it further, which could make it impossible to turn off in an emergency. Try gently turning it fully off and back on once to clear minor obstructions, but if it's genuinely stuck, call a plumber to service or replace it. This is a common and inexpensive job.
How do I know if it's a problem my water company should fix?
Your water company is responsible for pressure at the boundary stopcock (usually where the supply enters your property). If a pressure test shows less than 1 bar (10 metres head), contact them to investigate. If pressure is adequate at the boundary but low inside, the fault is yours to fix — often a stopcock or internal issue.
Is low water pressure expensive to fix?
It depends on the cause — a stiff stopcock service costs £50–150, whilst a booster pump installation runs £200–500. If the fault is with the mains supply itself, the water company fixes it free. Many common causes are inexpensive to remedy once identified, so diagnosis is your first step.