How to Stop Pipes From Making Noise

7 Practical Fixes for Noisy Plumbing

Noisy pipes can be frustrating, especially when you hear banging behind the walls, rattling under the sink or a loud knocking sound every time you turn off a tap. The good news is that many common plumbing noises have simple causes, and some can be fixed without calling a plumber.

The trick is working out what kind of noise your pipes are making. A banging sound might indicate water hammer, while a humming or whistling noise could point to a faulty valve, excessive water pressure or a restricted water flow. Loose pipes can also rattle against timber or other surfaces whenever water moves through them.

In this practical guide, you’ll learn how to stop pipes from making noise, identify the likely cause and try sensible DIY solutions. You’ll also discover which warning signs mean it’s time to call a licensed plumber before a small plumbing issue becomes an expensive repair.

What You Need to Know About Noisy Water Pipes

The first step in fixing noisy pipes is identifying the sound. Different noises often point to different plumbing problems, so listen carefully to when the noise happens.

These are useful clues rather than definite diagnoses. The same sound can have several causes, depending on your plumbing system.

Why Do Pipes Make Noise?

Water travels through pipes under pressure. When a tap opens or closes, a toilet refills or a washing machine changes its water flow, pressure and vibration can change throughout the plumbing system.

If a pipe is loose, it may knock against a wall or floor joist. If a valve closes suddenly, moving water can create a pressure wave known as water hammer. Hot-water pipes can also expand as they heat up and rub against nearby building materials.

Older homes may be more prone to noisy plumbing because of ageing valves, worn fittings or pipe supports that have loosened over time.

The important thing is not to assume every noise is harmless. Sudden changes, severe banging, leaks or persistent vibrations deserve closer attention.

How to Stop Pipes From Making Noise: 7 Practical Fixes

Start with the simplest checks. You may be able to identify the problem without opening walls or disturbing any pipework.

1. Check for Loose or Rattling Pipes

Loose pipes are a common reason plumbing makes a knocking or rattling noise when water flows.

If pipes are accessible beneath a sink, in a suitable service cupboard or in an accessible area of the home, look for sections that appear unsupported or that touch nearby surfaces.

What to do:

1. Turn on the relevant tap and listen for the rattling.

2. If the pipes are safely accessible, observe whether they visibly move or vibrate.

3. Check for loose pipe clips or brackets that can be inspected without dismantling the plumbing.

4. Where appropriate, have suitable pipe supports installed or adjusted to secure the pipework.

5. If a pipe is knocking against a timber surface, a plumber may be able to fit suitable cushioning material to reduce contact noise.

Never force a pipe into position or overtighten a fitting. Pipes need appropriate support while allowing for movement caused by temperature changes.

If the pipe is hidden inside a wall, ceiling or floor, don’t start cutting into the building just to locate the noise. Establish the likely cause first.

2. Reduce Water Hammer

Water hammer produces a sharp banging noise when moving water is stopped suddenly. You might hear it when turning off a tap, flushing a toilet or when an appliance shuts off its water supply.

How to address it:

1. Identify which tap, toilet or appliance triggers the banging.

2. Check whether the noise happens only when that fixture operates or throughout the house.

3. If a tap is responsible, try closing it more gently and see whether the noise changes.

4. If a washing machine or dishwasher causes the banging, check the appliance’s installation instructions and accessible hose connections.

5. If the noise persists, ask a licensed plumber to inspect the system and determine whether a suitable water-hammer arrestor or another repair is needed.

A water-hammer arrestor is a device designed to absorb pressure surges in plumbing. It must be suitable for the system and installed correctly.

Don’t confuse water hammer with ordinary pipe rattling. If the noise is caused by loose supports, fitting an arrestor alone may not solve the problem.

3. Check Whether Water Pressure Is Too High

Excessive water pressure can contribute to banging, humming, vibrating valves and stress on plumbing components.

If several taps or appliances trigger similar noises, pressure is worth investigating.

In Australia, the plumbing requirements for new work commonly use 500 kPa as the maximum static pressure for many domestic plumbing installations, although the applicable requirements and circumstances matter. Your local water provider may also have its own supply conditions.

What you can do:

• Look for a pressure-related problem affecting multiple fixtures.

• Check your water provider’s guidance on typical supply pressure.

• Ask a licensed plumber to measure the pressure with a suitable gauge.

• If pressure is excessive, have an appropriate pressure-limiting valve assessed or installed.

Do not assume the pressure is too high just because the pipes are noisy. A faulty valve, restricted fitting or loose pipe support can create similar symptoms.

Avoid adjusting pressure-control equipment unless you understand the installation and applicable requirements.

4. Inspect Noisy Taps and Valves

A whistling, squealing or buzzing noise near a tap can indicate a worn washer, damaged cartridge, loose component or restricted water passage.

The noise may become louder when you partially open the tap or when water pressure changes.

Try these checks:

1. Turn the tap on slowly and listen for when the sound starts.

2. Test other taps to see whether the problem is limited to one fixture.

3. If only one tap makes noise, the tap’s internal components may need attention.

4. Check for visible leaks around the tap base and accessible connections.

5. If the noise persists, arrange a repair or replacement of the faulty component.

Some tap repairs are manageable for confident DIY enthusiasts, but the correct procedure depends on the tap design. Turn off the appropriate water supply before undertaking any permitted maintenance, and never dismantle a pressurised fitting.

If a valve is vibrating loudly, don’t repeatedly force it open and closed. A plumber can determine whether it needs cleaning, servicing or replacement.

5. Investigate Noisy Hot-Water Pipes

Do your pipes make ticking, clicking or light knocking sounds after someone showers or uses hot water?

Thermal expansion could be the reason.

As hot water travels through a pipe, the pipe warms up and expands slightly. When it cools, it contracts. If it rubs against timber, metal brackets or another hard surface, the movement can create repetitive tapping noises.

Practical steps:

• Notice whether the noise occurs mainly after using hot water.

• Check accessible hot-water pipework for obvious contact with surrounding surfaces.

• Look for loose supports or signs that a pipe is rubbing against a nearby surface.

• Have suitable pipe supports or protective sleeves installed where needed.

Avoid wrapping pipes in unsuitable materials or packing gaps with random household products. Plumbing materials must be compatible with the pipe type and operating temperature.

If the noise comes from inside a wall, a plumber may be able to locate the source without unnecessary damage.

6. Check Washing Machines and Dishwashers

Sometimes what sounds like noisy plumbing is actually a vibration from an appliance or its water supply connections.

Washing machines can create banging when their inlet valves close, while poorly positioned hoses may knock against a wall or cabinet.

Here’s how to investigate:

1. Listen while the appliance fills with water.

2. Determine whether the noise occurs during filling, draining or spinning.

3. Check that the appliance is level and installed according to its manufacturer’s instructions.

4. Inspect visible hoses for kinks, obvious damage or contact with nearby surfaces.

5. Check accessible hose supports and connections without disconnecting pressurised plumbing.

If the noise occurs during the spin cycle, the cause may be an unbalanced load or an appliance fault rather than the water pipes.

Never pull a heavy appliance out by its hoses. Turn off the appliance and isolate its water supply before carrying out any permitted inspection that requires moving it.

7. Investigate Gurgling Drains and Persistent Vibrations

Not every plumbing noise comes from the water supply pipes.

Gurgling sounds from a sink, shower or floor waste may indicate a partial blockage, drainage restriction or ventilation problem. A blocked or poorly ventilated drainage system can affect how wastewater flows through the pipes.

What to check:

• Does the sink drain more slowly than usual?

• Does the toilet gurgle when another fixture drains?

• Is there an unpleasant sewage smell?

• Do several fixtures make noise at the same time?

• Is water backing up into a shower or floor waste?

For a minor, isolated sink blockage, removing visible debris from the plug or cleaning an accessible strainer may help.

However, avoid repeatedly pouring chemical drain cleaners into the plumbing, particularly when the cause is unknown. These products can create hazards and may damage certain materials.

If multiple fixtures gurgle, drains are slow throughout the house or wastewater backs up, contact a licensed plumber. The problem may be deeper in the drainage system.

Common Mistakes to Avoid When Fixing Noisy Pipes

A little investigation can save money, but the wrong fix can make a plumbing problem worse.

Helpful Tips for Keeping Plumbing Quiet

Once you’ve identified the likely cause, a few simple habits can help prevent the problem from returning.

• Pay attention to changes. A new noise often provides a useful clue about a developing fault.

• Operate taps gently. Avoid slamming taps shut, especially if doing so triggers banging.

• Maintain appliances. Follow manufacturer instructions for washing machines, dishwashers and other water-connected appliances.

• Look for leaks. Check accessible cupboards, under-sink areas and exposed pipework periodically.

• Keep an eye on water pressure. If several fixtures become noisy, have the supply pressure checked.

• Address small problems early. A loose support or worn valve may be easier to deal with before the noise worsens.

If you own an older Australian home, include exposed plumbing in your regular maintenance checks. Look for corrosion, damaged supports and signs of moisture around pipework.

A short recording of the noise can also help a plumber understand the problem. Capture when it occurs, which fixture is operating and whether the sound starts or stops suddenly.

When Should You Call a Professional Plumber?

Some noisy pipe problems are straightforward, but others require specialist equipment and experience.

Contact a licensed plumber if:

• Banging continues throughout the house: This may indicate a pressure problem, water hammer or a fault affecting several fixtures.

• You notice water leaks: Damp walls, wet ceilings, unexplained puddles or a sudden increase in your water bill can indicate a hidden leak.

• Water pressure changes suddenly: A noticeable loss of pressure or unusual surges should be investigated.

• Pipes vibrate violently: Severe vibration may indicate a faulty valve, pressure issue or inadequately supported pipework.

• Drains gurgle repeatedly: Multiple noisy drains or wastewater backing up may indicate a drainage problem.

• Hot-water equipment makes unusual noises: Persistent banging, hissing or other unusual sounds from a hot-water system warrant professional assessment.

• Pipework is hidden or difficult to access: Avoid cutting walls, lifting floors or working in confined spaces without understanding the risks.

In Australia, plumbing licensing requirements vary by state and territory. Use an appropriately licensed plumber for work that requires one.

If you smell gas near a gas appliance or suspect a gas leak, avoid operating electrical switches or creating flames, leave the affected area and contact your gas emergency service from a safe location.

The bottom line? Don’t spend money replacing pipes until you know why they’re making noise. A proper diagnosis can prevent unnecessary repairs.

Frequently Asked Questions

1. Why do my water pipes bang when I turn off a tap?

A loud bang when a tap closes can indicate water hammer. Moving water is stopped suddenly, creating a pressure wave that makes pipes or fittings vibrate. Loose pipe supports can make the noise worse. Try closing the tap gently and have persistent banging assessed by a licensed plumber.

2. How do I stop pipes from knocking inside walls?

First, determine which tap or appliance triggers the noise. Knocking may result from loose pipe supports, water hammer or pipes expanding and contracting. Accessible pipework may be secured with suitable supports, but hidden pipes should be assessed before you cut into walls.

3. Can high water pressure make pipes noisy?

Yes. Excessive pressure can contribute to vibrating valves, humming and banging. However, these symptoms can also have other causes. A plumber can measure your water pressure and determine whether pressure-control equipment needs adjustment or repair.

4. Why do my pipes make noise at night?

Noises may be more noticeable at night because the house is quieter. Automatic appliances, toilet cisterns refilling, hot-water use and temperature changes can all produce sounds. If you hear repeated hissing or water running when everything should be off, check for a leaking tap or toilet and investigate any unexplained water use.

5. Why do hot-water pipes tick or click?

Hot-water pipes expand as they warm and contract as they cool. If they rub against timber, brackets or other building materials, they may produce ticking or clicking sounds. Suitable supports and protective sleeves can reduce friction when correctly installed.

6. Are noisy water pipes dangerous?

Not necessarily. Mild ticking from thermal expansion or occasional light rattling may be harmless. However, severe banging, persistent vibration, leaks, sudden pressure changes or signs of water damage should not be ignored.

7. Will insulating pipes stop them from making noise?

Suitable pipe insulation may reduce friction noise and help protect against heat loss. However, insulation will not necessarily solve water hammer, excessive pressure or a faulty valve. Identify the cause before choosing a solution.

8. Should I install a water-hammer arrestor myself?

A water-hammer arrestor can help reduce pressure surges caused by rapidly closing valves. The correct device and installation location depend on the plumbing system. If you’re unsure about compatibility or Australian plumbing requirements, have a licensed plumber assess and install it.

 

Checking loose pipes under a sink