washing machine fitting

How to Install a Washing Machine: A Plumbers Advice

Learning how to install a washing machine is straightforward if you are fitting it in the same place as the old one.

If you are quite good at DIY, then you should be able to install a washing machine without the need to ring a plumber.

When fitting it into a new place that has not had a washing machine there before, you might need to arrange for a plumber to run a water supply and waste pipe in first.

Table of Contents

How to Install a Washing Machine in The Same Place as The Old One

Replacing your old washing machine for a new washing machine in the same place is the most common situation us plumbers come across when asked to fit a washing machine, and the easiest way to do it for a DIYer.

How to Disconnect a Washing Machine

First you will need to remove the old washing machine by disconnecting the electric supply, the water supply inlet hose, and the drain hose.

Disconnect The Inlet Hose

How to install a washing machine hose red and blue
Washing machine inlet hoses

To disconnect the water supply pipe, normally a flexible blue inlet hose, you will need to find out where it connects to the washing machine valve. 

Then, turn the water off by turning the blue handle on the valve 90 degrees.

You might have to turn the mains water stopcock off if you can’t turn the handle on the valve or if there is still water coming from the valve after it’s turned off.

This will normally be behind the washing machine or under the sink.

Some washing machines will have a hot water supply also with a red inlet hose and red valve handle, if so, you will need to disconnect both.

To disconnect, you have to turn the plastic nut on the end of the hose with your hand anti-clockwise and keep turning until it comes off.

Then pull the hose away from the valve.

There will be water in the hose still, even after the water has been turned off, so you should put a towel or bucket underneath to catch it.

How to Disconnect The Drain Hose

washing machine drain hose
Washing machine drain hose

A washing machine drain hose should be a grey flexible hose that is either poked in to a vertical stand pipe which can be simply pulled out.

If the drain hose is connected to your waste pipe under the sink, then should be able to pull it off.

You might need to use a screwdriver to remove the hose clamp, if there is one there.

Disconnect The Electric Supply

Find the plug socket and remove the plug.

You might have to pull the washing machine forward to get to the plug, but you might have to disconnect the washing machine hoses first if they are stopping you from moving the washing machine.

Install The New Washing Machine

Remove The Transport Bolts

If it’s a brand-new washing machine, then the first thing you need to do to plumb in your washing machine is remove the transport bolts from the back with a ratchet or spanner.

Then you need to fit the supplied plastic covers in the holes where the transport bolts were.

Connect to Cold Water Supply

Most washing machines nowadays only need a cold water supply plumbed in.

You should get a new inlet hose supplied with a new washing machine, normally blue or grey, but you can use the old hose if it’s easier.

If your old washing machine has a cold and a hot inlet hose, then you can leave the hot disconnected when fitting the new washing machine.

washing machine blank nut external
Blank nut

You will need to screw a 3/4 inch blank nut on the old hot washing machine valve after removing the hose to make sure it does not leak or accidentally get opened in the future.

Connect the water inlet hose to the connection on the washing machine, and the other end on to the washing machine valve with the blue handle.

Then turn the water back on by turning the handle on the valve.

Connect The Drain Hose

The new grey flexible waste water hose should be connected to the same place as the old one.

Make sure to use a hose clamp if needed and the horse shoe clip should be connected to the hose before pushing one end in to the stand pipe if you have one.

How to Install a Washing Machine in a New Location

There are three things to consider when learning how to install a washing machine where there hasn’t been one fitted before –

  1. Cold water supply 
  2. Waste water pipe
  3. Electrical socket

Cold Water Supply

A Washing Machine Valve
Washing machine valve

You need to make sure there is a cold water supply close to where you want the washing machine installed.

This could be the pipe fitted to an outside tap under the kitchen sink, for example.

There needs to be a washing machine valve on the cold water pipe to be able to connect the washing machine to your water mains supply via a flexible inlet hose.

Inlet hoses are normally 1.5 meters in length, but you can get 2.5 meter hoses also.

Waste Pipe

You will also need a waste pipe near to where you want your washing machine fitting.

This should be a standpipe with a trap on the bottom where you can poke the flexible drain hose into, or you can run it to a sealed waste pipe connection under the kitchen sink.

Electrical Socket

You will need an electrical socket to plug the washing machine in to.


This guide should teach you how to install a washing machine if you don’t already know how to, and you feel competent enough to give it a go. 

If you are fitting it in a new location that hasn’t had one before, then you will most likely need to arrange for a plumber to run some pipes in to where you need them.

You might also need an electrician to install a plug socket.

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