Plumbing under the kitchen sink

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Jupiter01

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I am planning a new kitchen fit and trying to get my head around the plumbing under the sink...
The service void in the cabinet is causing me some confusion. I can see how the waste pipe for the sink will disappear behind this but struggling to understand its usefulness for my copper pipes.

I currently have the mains stop cock which is only accessible by stretching your hand under the plinth. Awful!

I was planning to extend the pipe on this slightly and have it coming through the base of the sink cabinet and fit a lever valve here as my main stop point followed by a drain valve. As I understand it this, will be clipped to the back of the cabinet but not inside the service void. I ca then have further valves for the cold water that goes to the rest of the house and isolation valves for the kitchen tap. I also need to extend this feed to the washing machine which is in the Units next to this. I was going to clip the pipe on the back of the unit with an appliance valve for this too. Finally, I have a hot water feed coming from the boiler which I was going to also insert from the bottom of the unit, clip to the back of the cabinet and then feed the tap via an isolation valve. Is this the right approach or should I be hiding any of this out of sight and in the service void of the cabinet?

Thanks in advance.
 
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Have your hot/cold/waste coming horizontally through the back of the unit...it is easy to slide the unit back then.
Keep the washing machine isolating valve within the sink unit with the connection thread pointing downwards. Then bring the fill hose and drain hose up through a hole in the base of the unit.
 
Gasguru said:
Have your hot/cold/waste coming horizontally through the back of the unit...it is easy to slide the unit back then.
Click to expand...
Can you elaborate on this please. I don’t follow.

Notwithstanding your clarification, my next question was going to ask about the practicalities of this. Should I do all the pipework inside the unit and pop some pipe through the base. I then position the unit in place to figure out where the main feed needs to connect to the pipe going through the base and finally, connect the incoming pipe to this pipe.

Will I then have to reach under the unit to make this final connection?
 
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You just have hot/cold/waste pipes poking through the backpanel of the unit, slide the unit back and connect up the taps/washing machine outlet/waste etc.
The only hole through the base is for the washing machine fill hose/drain.

If you need to have pipework coming up through the base it just makes it more awkward.
Can't you have a access hole in the back for the new mains lever valve?
 
I could have an access hole but was planning to have a lever valve for water mains and then another one for where it goes off to the rest of the house. Also thought I should have a drain valve. I am unclear on whether I should go with the access hole approach or situate all the pipes inside and on the back of this kitchen unit.

Thanks for your guidance
 
@denso13 are you suggesting pipe entry from the base of the unit? And then everything clipped to the back of the unit (inside the unit).

How do I make this final connection once I’ve assembled all the pipework inside the unit?
 
Pipe entry from all at the back, or bottom, is easier. Some back, some bottom isn't so easy, it depends on where your existing pipework is.

You can bring the hot, cold and waste through the rear as @Gasguru says. You can also alter the main to come through the rear by leaving the main stopcock below the unit in place and fitting a new full bore valve within the unit.

If you see what I mean.
 
I thought the benefit of bringing the pipes from the bottom is that all the pipe is visible and can easily be maintained. It also gives me more pipe estate to tee off for taps, washing machine and fit lever valve and drain valve.
 
Jupiter01 said:
I thought the benefit of bringing the pipes from the bottom is that all the pipe is visible and can easily be maintained.
Click to expand...

Yes, bottom is no problem, pipe everything up then lift the unit over the pipes. All through the back of the unit is still ok, just keep the important bits visible within the unit.
 
i aim to get my hot and cold entering straight through the back between the shelf position and the bottom of the sink.
bowl . i never run the washing machine feed through the base as it means making more holes and faffing about through the shelf.
plumbers default setting on allowing for the fitting of the shelf is ‘f@ck it’ let the kitchen fitter worry about it. hence they don’t get fitted because their plumbing won’t allow.
 
bennymultifinish said:
i aim to get my hot and cold entering straight through the back between the shelf position and the bottom of the sink.
Click to expand...
Where would you situate the main lever valve and drain valve with this configuration? Will you have enough space if you start half way up the unit?
 
Jupiter01 said:
Where would you situate the main lever valve and drain valve with this configuration? Will you have enough space if you start half way up the unit
Click to expand...

Check the unit you are fitting and where the shelf is. Something you'll have to decide on site.
 
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