I Maggie, I think the sketch you have made of your proposed plan would work. If the full sink goes in the pantry, then it is very important to have the small sink, in the main kitchen area. This would be for washing hands etc, while preparing food, and also for getting drinks of water.
One change, I would swap the shelves with bench top,in pantry end, have the shelves on the opposite wall to what you have drawn. This is, to be aware of sight lines of people on the other side of your kitchen island. Shelves can get unintentionally messy.
And do not install a door, it will probably, never be closed.

It looks a long way from table to take dirty dishes to sink. Kids will be tripping over you and each other in this single person space. My pots would mount up if I had to disappear into pantry to clean up by myself. Pantries like u have designed should be for occasional forays to get supplies not heavy duty action as you propose, assuming it’s not the maid in there!

thanks @dreamer I think you're right by what you mean about the shelves, and we don't plan on putting a door. The only reason I'm putting the shelves there is because of where I plan to put the dishwasher in, I wanted it next to the breakfast bar. I also forgot to mention that there will be a big window in the wall where I think the double sink should go to let lots of natural light in the kitchen as well

Thanks for your input @kate, I thought of that as well that's why I put the dishwasher next to the bench. though I like your idea of just putting the cutlery and crockery drawers opposite the dishwasher. I don't even know if we can do my sketched plan, in terms of plumbing, as I have the impression the dishwasher has to go next to the sink? so I might put the double sink in the bench where the stove is (husband and I don't like the idea of sink in the island bench)

And kids yes, they follow me everywhere so will be cramped in the pantry if I'm washing the dishes there, husband is also a giant so he'll have more excuse not to do the dishes!

I think i might put the sink in the same island where the stove is, where i planned to put the single sink. and just leave the bench in the pantry alone, but put a window to let light in. because at the moment there is a full sized window there.

This is what I plan to do on that wall where I've drawn the double sink (sorry for the terrible drawing) And I'll put the dishwasher and sink on the bench where the stove is

the dishwasher doesn't need to go next to the sink..we have one at right angles with a corner cabinet (2 x 45cm doors) in between sink an dishwasher and plumbing and wiring is under the floor of the cabinet..we think it works so much better than next to the sink and we can load and unload the DW easily as sink, cutlery and crockery storage is within arms reach but any variation from standard needs to be planned from before construction begins, must be noted clearly on building plans not just kitchen plans and variation acknowledged by builder plumber and electrician as it's so easy for them to make assumptions

We are still on pre construction and very early planning so I understand what you mean that's why I'm just running through some ideas with our building consultant because i know things can be complicated or not possible if changing from original plan. Never had a dishwasher before so definitely gathering ideas from people who has them so thank you! I want our kitchen to be as functional and good flow as possible

do you have plans for the whole house, what are the rooms adjoining the kitchen..would help to see how the kitchen relates to the rest of the house

Personally Maggie, I would never have a full sink in the pantry. I prefer to be out in the main kitchen when I work. A pantry for me is for storage. I do not have a butler.
The only other suggestion, with the pantry situation, in your case. If having a big window in pantry, this could double as a servery to your outside entertaining. Therefore a small sink in the pantry might be useful. But I would put the full sink on the back wall in the kitchen proper, if you don't want it in the peninsula.
I would look at the peninsula becoming an island, then little people and big people do not have to go through the kitchen, past the hot stove, pots etc, to get their snacks.
And I prefer also sinks in the island, so you can be facing the rest of the home, when doing the dishes. Yes, my husband and I still do the dishes, every night together. Dishwasher is used when we have gatherings. PEople laugh at us, but that is our way.

This is your kitchen, so do it your way.

Thanks @dreamer. I took your advice because it makes sense (I'll post a photo of our new plan) I think it's lovely that you and your husband still do dishes together, I quite enjoy doing the dishes actually, but not when my toddler is stuck on my leg. Dishwasher will probably used when we have guests over. It's actually my husband who was sold on the idea of butler's pantry but I couldn't justify it and see the point that's why I posted on here to hopefully see from other's perspective so thank you. We are a young family so always taking the kids into consideration when planning the house. We also entertain a lot, Filipino buffet style, so an island will be perfect! I sew a lot and need a big space for cutting fabric as well that's also why we wanted to keep the island without the sink.

We plan to put a barn door as pantry door but we might do that later on after we have moved in and see how it goes or we might even leave it without a door but we will make sure they put in extra support in those walls for possible barn door.

We abandoned the idea of window inside the pantry because I figured it will let a lot of sunlight especially it's facing north east and not good for food storage obviously.

The only dilemma I have now is whereto place our microwave and deep shelving solutions for the pantry but we're pretty happy with this now.

Thank you all

Hi Maggie, well done with working out your space.
Regarding deep shelving options for the pantry, I would look at the deepest article that you will be keeping in the pantry, maybe a large appliance or a large long cereal box. Measure that article and make your shelves only as deep as that. It might be only 400mm deep that is required. Any deeper and things will get lost behind each other.
Personally I prefer microwaves at bench height. But, in your kitchen, under the bench between sink and cook top, may work. Then you can place the hot food directly onto the bench top above it.
I have attached a photo of a very space efficient pantry, for your info. All the best.

And a good idea about using the island for cutting fabric. When we didn't have kitchen islands... the kitchen table always had fabric on it with a tin of pins and patterns. Memories ......

We had a small pantry off our kitchen and have recently extended it so that we can have more storage and a full sink. One of the driver's was that when your washing-up is done in the main kitchen, you end up with all your drying on display. Now we we just stick it all in the pantry where it is out of sight and we have a pocket door that can be closed to hide it (really only happens when entertaining)

We still have a smaller double sink in our kitchen island which is used for draining liquids, filling kettles and minor washing up.

Butler's pantries, people seem to love them or not see the point, just depends on your lifestyle and your space. My wife did like to do the washing up in the kitchen to keep an eye on the kids but as they grow older it's not as big a deal as a permenantly untidy kitchen.

Not sure the size you had in mind but we have 2.5m X 1.5m deep and we made it 2.5m deep now.

We have a double sink in the ‘butler’s pantry’ and the only time we use it is to soak roasting pans or fill the kettle. We did not build this house but if we had, I would have put a small sink and had more bench space for my kettle and coffee machine