Low Water Pressure At Home: What’s Causing It And How To Fix It

Experiencing low water pressure at home can be frustrating, whether it’s a weak shower or slow-running taps. For London households, it's a common issue with a variety of causes. Some are minor—like an isolated blocked aerator—while others might involve deeper problems in your household plumbing system. 

The key to restoring full flow is understanding what’s causing the pressure drop and how to address it. Whether it's a quick DIY check or something best left to a qualified London plumber, we’re here to guide you. 

Need expert help right away? Speak to our team by calling 020 8682 2244 or email info@maintracts.co.uk—we’re available 24/7 across London. 

 

 

Why Am I Experiencing Low Home Water Pressure?

Low water pressure at home typically shows up in ways such as: 

• Dribbling taps 
• Weak shower flow 
• Baths taking longer to fill 
• Washing machines running inefficient wash cycles 

Sometimes the problem is isolated to a single tap or bathroom. Other times, it affects the entire property—indicating a system-wide issue. 

Understanding low water pressure causes is the first step toward a lasting solution. 

 

Common Causes Of Low Water Pressure At Home

Let’s explore the most likely reasons your London home might suffer from falling water pressure:

1. Partially Closed Internal Stopcock Or External Stop Valve

One of the most common—and easily resolved—issues is a partially closed internal stopcock or external stop valve. These valves control the incoming flow into your property. If they’re not fully open, you’ll experience reduced pressure. 

Tip: Locate your internal stopcock (typically under the kitchen sink or in a cupboard) and turn it gently anti-clockwise to ensure it’s open. 

2. Pressure Reducing Valve Issue

Many London homes now have a pressure reducing valve fitted on the incoming mains water pipe. Faults or incorrect settings on these valves can lower water flow, especially during high-demand periods.

Servicing or adjusting the valve may restore better pressure levels.

3. Hidden Leaks Inside Your Property

Low water pressure can be an early warning sign of a hidden leak—common in ageing properties and plumbing systems. 

Signs include: 

• Damp patches on walls, ceilings, or flooring 
• Sounds of running water when no taps are open 
• Unexpected increases in your water consumption or bills 

Prompt hidden leaks detection ensures safety and water conservation. 

4. Mineral Build-Up Or Corroded Pipes

Over time, mineral build-up in pipes or general corrosion—especially in older copper or galvanised steel plumbing—reduces internal pipe diameter, restricting water flow.

If your home suffers from scaling or corrosion, a professional may recommend replacing the affected parts of your system.

5. Blocked Aerators Or Taps

If pressure is only low at one tap or shower, inspect for a blocked filter (aerator). These mesh fittings located inside taps often collect debris.

Remove the aerator, rinse it thoroughly with clean water, then reattach. Regular cleaning prevents sediment build-up and preserves pressure.

6. Shower Pressure Problems?

Is your shower the only issue? Read our location-specific blog: Fix Low Shower Pressure in Your Fulham Home 

 

Effective Water Pressure Solutions For London Homes

1. Install A Mains Booster Pump

In properties with chronically low supply, a mains booster pump or accumulator tank is often the best long-term fix. These solutions increase the pressure throughout your entire system—a great option for homes with loft conversions or multiple bathrooms.

2. Clean Taps And Shower Fixtures

Routine cleaning of tap and showerhead filters can improve flow dramatically—particularly in areas affected by metal sediments or mineral particles.

3. Replace Ageing Or Corroded Pipes

If outdated pipework is the issue, replacing the affected sections restores performance while reducing the chance of future bursts or leaks. Our licensed London plumbers handle the process efficiently and safely.

4. Contact Thames Water

If your external stop valve is open and your neighbours are also affected by reduced pressure, the issue may lie with the public supply system. In this case, you should call Thames Water, who are responsible for mains supply in your area. 

Want to learn more? Explore our complete guide: Why Is Water Pressure Low 

 

Low Water Pressure Troubleshooting Checklist

• Ensure internal stopcock and external valve are fully open 
• Check with neighbours to rule out supply issues 
• Look for signs of hidden leaks 
• Inspect and clean tap/shower filters 
• Try fixtures individually to isolate the issue 
• Consider tank or pump installation if needed 
• Contact a professional for safe and permanent repairs 

Could boiler pressure be part of the problem? Learn to adjust it easily in this guide: Is Your Boiler Pressure Too High Or Low 

 

When To Call A Low Water Pressure Plumber In London

Tried all the basics but still have low water flow? It’s time to call in a professional when: 

• Pipes are corroded or outdated 
• Pressure reducing valve faults are suspected 
• Pressure is consistently low across all fixtures 
• A booster pump or accumulator tank is required 
• Building renovations increase water demands 
• You suspect internal or underground leaks 

At Maintracts Services Ltd, our expert London plumbers diagnose, fix and future-proof plumbing pressure issues quickly—with solutions suitable for homes, flats, and larger properties. 

Final Thoughts: Reclaim Full Water Flow

You shouldn’t have to live with frustratingly poor pressure. Whether it’s a partially closed valve, pressure reducing valve issue, or internal corrosion, there is always a solution—and Maintracts can deliver it. 

For quick, reliable service from experienced London plumbers, call 020 8682 2244 or email info@maintracts.co.uk to book your visit now.