Our island is 900 depth, 2400 wide, with a sink in the middle (opposite the cooktop), which works well for us. Plenty of prep area either side of the sink (mind you, it's a single undermount sink, about 500mm wide, with no drainboard). If we were going to use the island for actual meals, ours is only deep enough for a person either side of the sink. So, if you're thinking of having the island as a dining area, go to the 1200 depth. Just walk around it to clean it. On the other hand, if the island is going to be for prep, and a place for guests to prop up a glass of wine and chat while you're getting dinner, 900 is fine. Our dishwasher is to the immediate left of the sink, and we have pull out waste bins underneath the sink. We have 1200 mm space from island to the wall side and the range top, and about the same to the other ends. Our fridge, which isn't huge, is in a 900 mm+ cavity which would be big enough for a deeper fridge. It's in relatively the same place your fridge is, and works fine there. Hinges are on the non-kitchen side of the door, so it opens into the kitchen. Cabinets beside it are a bit more in depth, so fridge and cabinets line up nicely. 850 for your fridge seems reasonable to me. I wouldn't put that study where you have it: I think you'll need all of that butler's pantry for butlering type storage. My 5 cents worth based on new house, new experience, absolutely no kids in the equation!

@mlk01, You are right about the message button, I have it on my profile but no one else seems to so that's odd! If you click on my profile for example, you will see on the top line right beside the profile picture: Your house, Ideasbook, Bookmarks, Activities, Messages. In fact I remember that when anyone typed a reply like I'm doing now, you used to be able to click a "private" button, which meant only the person you were typing to saw your comment. Perhaps Houzz can answer these anomalies?? I'm not on Facebook or Twitter, never got into it and have no reason to do so anytime soon ha-ha As for talking privately to someone, you could post your email address here as could oklouise and delete it whilst you are still able to edit, as I've done once in the past. Just not sure how long the edit feature lasts.

Thanks for all the input! Lots to think about here. To answer the questions, to the right of the door is a bump out from a linen cupboard in the hallway - we won't be moving or resizing that. There are no windows (all walls are internal). Yes, we were thinking of a 'ladder' style towel rack to use some height. The doorway is 700mm and the toilet wall to the doorway is 1150mm. We don't have a specific stool or vanity selected yet. Re why we wanted to include a seat of some sort - I use the edge of the bath every day, both for putting a foot up while drying off or applying moisturiser etc, and for sitting on for foot care / clipping nails etc. I have to admit that I hadn't considered just using the toilet seat as I'm used to those older, slightly domed lids that 'buckle' if you sit on the centre of them. But I can see now that newer toilets appear to have flatter and more solid lids, so perhaps that is an option afterall. We also wanted to select a stool that could go in the shower - my husband is quite sporty and would love a sit-down massage shower on occasion. I'm thinking now that we perhaps just have a 'wet' stool live in the shower recess (bottom right corner of the plan should be out of the way) and then the toilet lid for 'dry' use. The last picture shared by dreamer is a very nice solution, though if we extend the vanity all the way to the left hand wall we'll have to look at narrower towel racks. Hmm, all very interesting! I'll experiment some more and probably come back to bounce some more ideas off you all. Thanks. :)

That was my original idea to put one beside the other in the master ensuite, and then one each in the other ensuite, powder room, and bathroom. The bathroom will be a guest bathroom, so no need for a large vanity or storage. I have now spoken to our kitchen guy, and he can make up new units using the sinks from the incorrect sized ones. That way we can also use the tap ware that I purchased. He can match the cabinetry and bench tops for these rooms to our kitchen cabinetry, so all good, thank you. I think the plumber plumbed in two connections for the master ensuite, but the kitchen guy can work around that.