What to Do If You Hear Banging in the Pipes
Last updated: 3 August 2025
Step 1: Identify When the Noise Happens
Take note of when the banging occurs — is it when you turn taps off? When the washing machine stops? This can help determine whether the cause is a water hammer (a sudden stop of water flow) or another issue like loose pipe fittings or air in the system.
Step 2: Check for Loose Pipes
If the pipes aren’t properly secured to the wall or floorboards, they can knock against surrounding surfaces. Carefully inspect visible pipework and add cushioning or brackets where needed to hold them firmly in place.
Step 3: Drain the Plumbing System
To reset trapped air or reduce water hammer, try draining your system. Turn off the mains water supply, then open all taps starting from the top floor to the bottom to let water drain out. Once empty, close all taps and turn the supply back on slowly.
Step 4: Install Water Hammer Arrestors
If the banging is caused by water hammer, fitting a water hammer arrestor near the noisy appliance can absorb the shock and prevent the noise. This is a job you may be able to do yourself with basic tools, or you can ask a plumber to help.
Step 5: Call a Professional if the Problem Persists
If you’ve tried these steps and the noise continues, or if pipes are hidden behind walls or floors, it’s time to contact a plumber. Ongoing banging could eventually cause leaks or pipe damage.