DIY GUIDE · PLUMBING & HEATING · CHECKED OCTOBER 2026
How to plumb in a washing machine or dishwasher yourself
An hour or two. €19–€48 for an inlet hose, washers, a valve and a waste fitting if yours are worn.
Existing valve, existing waste, existing socket: connect the new machine to them properly, level it, and watch the first wash.
- Every step, start to finish
- Checked October 2026 — sources at the end
- Honest about when to call a pro
FIRST, THE HONEST ANSWER
Do it yourself, or get a plumber?
Do it yourself if…
- An appliance valve, a standpipe or a sink trap with a spare spigot, and a socket are already in place where the machine will go
- The new machine is a like-for-like swap for one that worked there before
- You can turn the appliance valve on and off by hand and it does not drip
- There is a second person to help you move the machine, or you can walk it safely on a sheet of board
Get a pro if…
- There is no valve or no waste connection and one has to be teed into the pipework or run through a wall
- The machine is going into a new position away from the existing supply and drain
- There is no socket within reach of the plug, or the socket is behind the sink or near the tap
- The supply pipe or the standpipe is hidden in a wall and leaks when you test it
Safety first
- A washing machine is heavy and awkward. The HSA's manual handling guidance counts posture, twisting and the shape of the load as risks, not only weight; walk it on a board with a helper and never lift it by its door or worktop.
- Unplug any machine before you touch its hoses, and keep water away from the socket. If water has reached the socket, switch off at the board before you touch the plug.
- Plug the machine straight into a wall socket. The maker we read rules out extension leads and multi-plugs because of overheating.
- Water left in an old drain hose can be hot and dirty. Empty it into a bucket with the hose end low, and wear gloves.
- A dishwasher contains detergent residue that irritates skin and eyes. Rinse anything you touch and wash your hands before eating.
- Never cut into a pipe or wall behind the machine to make room; cables and pipes often run exactly there.
Stop here: Stop here: new pipework and any change at the socket
Teeing a new valve into a supply pipe or running a new waste through a wall is a plumber's job, not a hose connection. On the electrical side, Irish law under S.I. No. 264 of 2013 makes a new circuit, any change at the distribution board and any work in a bathroom or other special location restricted electrical work that only a Registered Electrical Contractor may carry out and certify; the CRU prosecutes unregistered work. Swapping a damaged socket front like for like is minor work, but moving or adding a socket for a machine is best left to a registered contractor who will test and certify it. How to hire a kitchen plumber →
| MATERIAL | COVERAGE | FOR THIS JOB |
|---|---|---|
| Cold inlet hose | The one supplied with the machine, or a longer replacement with the same three-quarter-inch nut | One |
| Hose washers | Flat rubber washers for the hose nuts, ideally the filtered type at the valve end | A small pack |
| Appliance valve | Lever-operated, to replace a stiff or weeping old valve | One, only if needed |
| Hose clip | Sized to the drain hose | One, for a trap spigot connection |
Will the drain hose reach at the right height
Hose needed = height up from the floor to the top of the loop + distance along the wall to the standpipe + the drop into it. If the loop must top out 600 mm up, the standpipe is 700 mm away and the hose hooks in 100 mm, about 1.4 m of hose reaches.
The maker we read gives a height window for the hose and a short limit on how far it goes into the drain. Keep the highest point of the hose inside that window and add an extension only with a proper connector and clip.
Most washing machines and many dishwashers take a single cold fill. The maker of one popular machine is clear that a single-inlet model must not go on the hot supply, or the laundry is damaged or the machine stops in protection mode. Find the valve that serves the space and trace it back. If it is on the hot pipe, it is for an old twin-fill machine and the new one needs a cold valve.
The same maker gives a working range of 1 to 10 bar and wants 10–80 litres a minute from a fully open tap. Mains cold in most Irish homes is comfortably inside that; a valve teed off a pipe fed from the attic tank may not be. If the pipe to your valve comes down from the attic rather than up from the stop valve, check the flow before you rely on it.
New machines come with an inlet hose, and makers say not to reuse an old one: a hose that has been under pressure for years has a tired rubber seal and a fatigued crimp. Buy a longer hose if the supplied one will not reach in a loose curve, rather than adding a joint behind the unit.
The drain goes either into a vertical standpipe with its own trap, or onto a spigot on the side of the sink trap. Both work. A spigot connection needs a hose clip and the hose looped up high before it drops to the trap. A standpipe needs the hose hooked in, not pushed deep. If neither exists, a plumber fits one.
The machine wants a hard, level floor, not deep carpet or a springy floating floor. One maker asks for at least 1 cm between the machine and the cabinets, and warns against any spot that could fall below 0 °C. Check that the plug reaches the socket without an extension lead, which the same maker forbids.
THE PART THAT DECIDES THE FINISH
Before you start — what is behind the machine
Pull the old machine out, or look into the empty space, and find which of these you have. Each one has its own prep.
A lever appliance valve and a standpipe
The tidiest set-up. A blue or red lever valve on the pipe and a vertical waste pipe beside it.
- Turn the lever across the pipe to close it, and open it briefly into a bucket to prove it works
- Look down the standpipe with a torch for lint or a sock left by the last machine
- Check the standpipe is fixed to the wall and does not move when you push it
- Wipe the valve thread clean so the new washer sits flat
A slotted valve and a sink trap with a spigot
Common under kitchen sinks. A small valve with a screwdriver slot, and a short pipe stub on the side of the trap.
- Turn the slot across the pipe with a screwdriver to close it
- Check the spigot is not still capped with a blanking plug or a sealed membrane
- If the membrane is sealed, cut it out carefully with a utility knife, working from the open end
- Look under the trap for old drips; a trap that already weeps needs new washers first
A stiff, seized or weeping old valve
A valve that will not turn, or leaves a ring of green crust on the pipe.
- Do not force it with a wrench; a valve that shears on a live pipe floods the kitchen
- Close the stop valve for the house first and open the cold tap to drain the pipe
- Replace the old valve with a new one of the same type on the same pipe end
- If the valve is soldered on, or is a self-cutting type clamped to the pipe, leave it to a plumber
An old machine still connected
Hoses and plug still in, often full of water.
- Unplug the old machine at the socket before you pull it out
- Close the valve, then undo the inlet hose into a bucket; it holds more water than you expect
- Lift the drain hose out of the standpipe and lower its end into the bucket to empty it
- Keep the old hoses with the old machine; they are not worth reusing
THE JOB
How to plumb the machine in
Set up and isolate
15 minClear the space, roll back any mat and lay towels on the floor. Unplug the old machine if there is one. Find your case in the cards above and close the valve, or the stop valve if the valve is suspect. Keep a bucket and torch where you can reach them.
- Photograph how the old hoses ran before you undo them
- Take the doors of an adjoining cupboard off if they get in the way
- Check where the socket is so the cable does not end up trapped under the machine
Mistake to avoid: Pulling the old machine out while its hoses are still connected. The inlet hose tears off its valve and the drain hose empties across the floor.
Prepare the valve and the waste
20 minThis is the prep from the cards above. Clean the valve outlet thread. Look down the standpipe and clear it. If you are using a trap spigot, cut out any sealed membrane and check the trap's washers are sound. Replace a stiff valve now, with the house supply off, before the new machine goes anywhere near it.
- Run a cloth inside the standpipe mouth to feel for a blockage
- Have the hose clip on the drain hose before you push it onto the spigot
- Replace both trap washers if one is perished; they age together
Mistake to avoid: Connecting a new machine to a valve that will not close. The day it leaks you will have no way to stop it except the stop valve.
Unpack and remove the transit bolts
15 minA washing machine arrives with bolts through the back that lock the drum for transport. Undo each one with a spanner until it turns freely, pull it out with its spacer, and push in the plastic caps supplied. Keep the bolts in a bag taped inside the cupboard. A dishwasher has no transit bolts but may have packing inside; take all of it out.
- Count the bolts against the number in the manual
- Keep the bag of bolts with the machine's paperwork for when you move house
- Check the drum turns freely by hand once the bolts are out
Mistake to avoid: Running a washing machine with a transit bolt still in. The drum cannot move on spin and the machine can be damaged on the first wash.
Fit the inlet hose
10 minFit the hose to the machine first if it is not already on, then to the valve. Check the flat washer is in each nut. Tighten both nuts by hand only, firmly, with no tool. One maker states it plainly: hand tight, never with a tool. Run the hose so it curves gently from the valve to the machine with no kink behind the unit.
- A filtered washer at the valve end catches grit from the pipe
- Route the hose where the machine will not crush it when pushed back
- Leave the valve closed until the drain is connected
Mistake to avoid: Tightening the hose nut with pliers. The plastic nut cracks or the washer is crushed, and the joint drips from the start.
Connect the drain hose at the right height
15 minFor a standpipe, hook the shaped end of the drain hose over the rim and push it in only a short way. The maker we read sets a height window for the hose and asks you not to put the end more than 15 cm into the drain or under the water. For a trap spigot, push the hose fully onto the spigot, tighten the clip, and loop the hose up to the top of the cabinet before it drops back down.
- Clip the hose to the side of the cabinet so the loop cannot sag
- Never let the hose end sit in the water in the standpipe trap
- If the hose is short, use the maker's own extension and a clip, not tape
Mistake to avoid: Pushing the drain hose a long way down the standpipe. The machine siphons as it fills, empties as fast as it fills, and never finishes the cycle.
Walk the machine into place
10 minWith a helper, tilt and walk the machine back on its sheet of hardboard, feeding the hoses and cable as it goes. Stop short of the wall and check nothing is trapped. Plug it in to the socket, not an extension lead. Leave a little gap at the sides and the back.
- Lift with your legs and keep the machine close to your body
- Push it the last few centimetres from the front, not by the door
- Look behind with the torch before the final push
Mistake to avoid: Shoving the machine back blind. The inlet hose folds flat behind it and the machine fills so slowly it reports a fault.
Level and stabilise it
15 minPut the spirit level on the top, front to back and side to side. Loosen the lock nuts on the adjustable feet, turn each foot until the machine sits level and does not rock when you push the corners, then lock the nuts again.
- Check the level again with the machine in its final position
- Press each corner: any rock means one foot is still short
- On a tiled floor, check the feet sit on tiles, not on grout lines
Mistake to avoid: Leaving the machine rocking. On spin it walks into the cupboard, bangs the worktop and wears out its bearings.
Turn on and check every joint
10 minOpen the valve slowly. Look at both ends of the inlet hose with the torch and run a dry tissue round each nut. If one drips, close the valve, undo the nut, check the washer is seated and retighten by hand. Do not run the machine until both ends are dry.
- A tiny bead at a nut is a washer sitting off-centre
- Check again after five minutes, once the pressure settles
- Keep the towels down for the first wash
Mistake to avoid: Opening the valve and switching straight on. A slow drip behind a machine can run for weeks before the floor shows it.
Run an empty first cycle and watch the drain
60 minRun a short or rinse cycle empty, or a dishwasher's quick wash, and stay with it. Watch the drain point as the machine empties: water should flow away freely with no backing up in the standpipe or the sink. Check the inlet joints once more while it fills.
- If the sink fills when the machine drains, the trap or waste is part blocked
- A machine that keeps filling and draining is siphoning; lift the drain hose
- Wipe dry and check the floor behind the machine the next morning
Mistake to avoid: Leaving the first wash unattended. That is the cycle on which a loose drain hose lifts out of the standpipe and floods the kitchen.
The mistakes that show
- Leaving the transit bolts in a new washing machine
- Reusing the old inlet hose with the new machine
- Tightening hose nuts with a tool instead of by hand
- Pushing the drain hose too far down the standpipe
- Running the machine off an extension lead
- Leaving the machine unlevelled so it walks on spin
Stop here and get a plumber
- There is no appliance valve and one would have to be teed into a pipe
- There is no waste and a new trap, standpipe or hole through the wall is needed
- The machine is moving to a new position away from the existing supply and drain
- The socket is missing, damaged or too close to the sink, or a new socket is needed
| WHAT YOU SEE | WHY, AND THE FIX |
|---|---|
| Machine fills and drains at the same time | The drain hose is too low or pushed too far into the standpipe, so it siphons. Lift the loop higher and pull the end out so only a short length is inside. |
| Water backs up in the sink when the machine empties | The sink trap or the waste beyond it is partly blocked. Clear the trap and the waste pipe; if it still backs up, the drain further on needs clearing. |
| Drip from the inlet hose nut | The washer is missing, twisted or perished. Close the valve, undo the nut, fit a new washer and tighten by hand. |
| Machine says no water or fills very slowly | The valve is not fully open, the hose is kinked behind the machine, or the inlet filter is blocked. Open the valve, straighten the hose and clean the filter as the manual shows. |
| Laundry comes out very wet | The drain hose sits too low and water runs back into the drum. Raise the hose into the height window in the manual. |
| Loud banging on spin | A transit bolt is still in, or the machine is not level. Check for bolts first, then re-level and lock the feet. |
| Socket trips or the machine cuts out | A fault in the machine or the circuit. Unplug it and do not use it; if the socket or circuit is the cause, that is work for a Registered Electrical Contractor. |
| Smell from the standpipe | The standpipe trap has dried out or is fouled. Run water down it and clean the trap; a trap that keeps losing its water is siphoning and needs a plumber to look at the venting. |
WHAT YOU SAVE
What it costs to do it yourself
| Cold inlet hose, 1.5 m | €9.19–€9.29 |
|---|---|
| Pack of hose washers | €3.79 |
| Appliance valve, straight or angled | €6.39–€7.29 |
| Plumbing-out waste kit, if no spigot | €26.99 |
| Total | €19–€48 |
| DIY total | €19–€48 |
Guide prices compiled by the Locufy team from published Irish and UK provider price lists and 2026/27 cost guides. Updated 2026.
Most of the time the new machine's own hose is enough and the cost is almost nothing. The money goes on a valve or waste fitting only where the old ones are worn.
RATHER NOT?
Kitchen plumbers near you, with prices shown
The ones who cover your area, nearest first, with one score from every review. No account needed to look.
Or post the job free and let them come to you.
Both machines have a filter you should clean: the drain pump filter behind a small door on a washing machine, the filter in the base of a dishwasher. Clean them every month or two and the drain problems mostly never start.
The machine maker we read suggests keeping the valve closed when the machine is not in use. At the very least, close it before you go away for a few days.
An old washing machine or dishwasher is electrical waste. Any civic amenity site takes household electrical items free of charge, and a retailer selling you the new machine must take the old one back on a like-for-like basis; mywaste.ie lists drop-off points near you.
Tape the transit bolts, the manual and the receipt inside a cupboard. You need the bolts every time the machine moves and the receipt for any warranty claim.
Plumbing in a washing machine or dishwasher: questions people ask
Yes, where the valve, the waste and the socket are already there. Connecting the hoses, levelling the machine and testing it is a householder job. Adding a valve into a pipe, a new waste or a new socket is not.
Most modern machines are cold fill only. One maker warns that a single-inlet model on the hot supply damages laundry or stops in protection mode. Use a cold valve.
Inside the height window your machine's manual gives. The one we read sets a minimum and a maximum height and says the hose end should not go more than 15 cm into the drain.
No. The hose seals on a rubber washer inside its nut. Tape stops the washer seating and can make it leak. Hand tight is the maker's instruction.
No. Machine makers rule it out because of the risk of overheating. If the plug does not reach a socket, have a Registered Electrical Contractor add one.
Locufy's Irish price guide puts kitchen plumbing at €200–€900 per job, typically €450. Connecting a machine to an existing valve and waste is at the low end; new pipework costs more.
MORE GUIDES
More DIY guides
Sources — checked October 2026
- Beko — washing machine manual: connecting to the water supply
- Beko — washing machine manual: connecting the drain hose
- Beko — washing machine manual: installation location
- Beko — washing machine manual: electrical connection
- HSA — guide to the manual handling of loads (General Application Regulations 2007)
- S.I. No. 264 of 2013 — Electricity Regulation Act 1999 (Restricted Electrical Works) Regulations
- MyWaste.ie — WEEE help and FAQs: civic amenity sites and retailer take-back
- MyWaste.ie — washing machines
- Woodie's — appliance fittings (price check)