Most pipe noises have an obvious cause once you know what to listen for. Here’s how to tell the harmless ones from the ones you should get looked at.
A Loud Bang
This is water hammer — a pressure shockwave when fast-moving water stops suddenly, usually right as a tap shuts off or a washing machine finishes filling. What you’re hearing is the pipe jolting against whatever it’s clipped to. Loose brackets make it worse, because the pipe has room to move instead of staying put. Left alone, repeated hammering loosens joints and shortens the life of valves.
A Whistle or Screech
Water forced through a gap narrower than it should be. Usually a partially closed valve, a worn tap washer, or a failing ballcock in an older toilet cistern as it refills. If it happens every time one specific tap or appliance runs, that’s your clue.
Gurgling
An airlock, most often after work’s been done on the pipework or the supply’s been off and on. Can also mean a partial drain blockage, with water finding another way round and pulling air through as it goes. If it’s the same drain every time, don’t wait for it to become a full blockage.
Ticking or Creaking
Normal. Pipes expand slightly with hot water and contract as they cool. Very common in Harpenden’s older Victorian and Edwardian homes, where copper pipework runs through timber that’s doing the same expanding and contracting.
Check These Yourself First
Loose pipe clips under sinks or in the loft — tightening them often stops banging outright. Whether the noise lines up with one specific appliance switching off. And if a toilet’s whistling, the fill mechanism inside the cistern is usually the cheap, obvious fix.
When to Get Someone to Look
Banging that’s got louder or more frequent. Any noise paired with a pressure drop elsewhere in the house. Noise from a pipe run that’s also damp or discoloured nearby. A whistle that won’t stop even after you’ve checked the taps and cisterns.
Water hammer especially can work joints loose over time — and a loose joint eventually becomes a leak, which costs a lot more to fix than the noise ever did.
If your pipes are making a noise that doesn’t sound right, our Harpenden plumbers will tell you honestly whether it’s a problem — and fix it if it is.
