Fix low water pressure
Save £60–100 today
30 mins · Beginner · Saves £60–100 vs a plumber
Last updated: March 2025
Before you start
First establish whether it is one tap, one room, or the whole house. That tells you where to look.
In the UK, the water company is responsible for pressure at the street. Inside your home, it is usually a blocked aerator, a partially closed valve, or a scale build-up.
Tools needed
- ✓Adjustable spanner — for removing aerators
- ✓Small bowl — to catch water when removing the aerator
- !Descaling solution or white vinegar — buy: buy: £2–4 to soak a blocked aerator
Find out which taps are affected
Test every cold tap in the house. If pressure is low on one tap only, the problem is local (aerator or valve). If it is low on all taps, the problem is the mains supply or the main stop valve.
Where beginners go wrong
Assuming low pressure on one tap means a whole-house problem — check other taps first.
Putting the aerator back without rinsing — vinegar and loosened scale will come out of the tap.
Not checking whether the stop valve is fully open — this is the most common cause and takes 5 seconds to fix.
Stop and call a plumber if...
Pressure is low on all taps and your stop valve is fully open — call the water company
You suspect the pressure reducer (PRV) on the mains inlet is faulty
There is a visible leak on the mains pipe coming into the property
Cost breakdown
What you just learned
You now understand how water pressure works through your home — from the street main to each tap. You can diagnose whether a pressure problem is local or whole-house.
What this unlocks
These diagnostic skills transfer to identifying airlocks in pipes, tracing why one radiator is cold, and understanding your whole water distribution system.
✅ Completed by 1,347 people
⚠️ Watch out if you rent
If low pressure is a whole-house issue, it is the landlord's responsibility to investigate and fix. Report it in writing. For single-tap issues, cleaning an aerator is a reasonable tenant repair.