Hi I am really interested in this discussion for similar reasons. Currently our plans squeeze in a pantry under the stairs so 1.5 m X 1 m. Builder suggests we shrink ensuite from 3350 x 1650 to 2350 x1650 long so it becomes a proper walk in pantry 2m x1.5 m. I was concerned I will end up with two nonfunctional spaces. But it sounds like the pantry will work. What are everyone's opinion on a master ensuite size. It means I'll have a single basin vanity only 500 m wide

yes on closer look I'd agree with 3D re master layout, but of course it is personal preference......it seems a little strange walking through a robe before accessing a main master space - I think this part of the issue with the upper layout in that you've got master zone directly next to the 2nd (kids) living area and what this is trying to achieve is appropriate separation, which it does, but arguably not managed as well as it could be. I like the lobby idea, but ideally the master should come off the lobby and then maybe then access the ensuite via the WIR if you need.....IMO it's worth considering other layout options in this area - it's like it's a tight site flow solution that's being forced because of the scale, when a master suite for a residence such as this should not feel odd or awkward. but properly balanced....perhaps the answer is something like flipping the master and Bed 3 positioning so the Master access is more direct via a lobby and the Bed 3 is more appropriately zoned like the others...various pro's& cons to weigh up one way or the other

I would not go with any of your options. I would continue bench and overhead cupboards with appliances and sink in a U shape taking up the whole wall space. Then purchase a skinny appropriate proportioned dining table. This could also utilised as a preparation surface as well.

From a "passive solar design" point of view, everything is right. Rectangular home facing north/south. With north facing living rooms, rarely used rooms to the west. But one other thing to consider, plumbing. Locating it close together will lower building costs, & the wastage of water, waiting for hot water. So I'd consider swapping bedroom 4 for the western wet areas. Behind the kitchen is have the laundry, then bathroom, then linen, the bedroom furthest to the west. I'm not mad about western bedrooms, especially in hot climates. But in this case it sounds like it would be used sparingly. Plus if make sure there was no western window, just a northern one. Insulating the western wall well, & using a radiant barrier (reflective insulation). The approach will also significantly shorten the length of the western hallway. Greatly increasing the size of bedroom 4. Talking room sizes, & room numbers, from a sustainability point of view, I think the home is too large for what is likely to be a two person home for much of the time. The embodied energy (emissions created) from a new build home is huge, averaging 15 years of operational energy. I'd be looking to reduce the house size, by using multipurpose rooms. The occasional kids housed in the study, or the media room. This can work out great with clever design (like incorporating murphy beds). How will the media room be used? Will noise be an issue. Will you be happy to have it so close to the master bed? The building orientation/shape will be great for solar PV, with a large roof area facing north. I'd I was building nowadays, is be aiming for an all-electric home. Ditching gas - of its even available where you are - in favour of efficient electric appliances. Reverse cycle AC for heating (if it's required), supplemented by fans for cooling, hot water heat pump (extremely efficient), induction cooktop (sensitive, fast acting, easy to clean). All powered by solar PV. If it's an option, I'd look at 3 phase power, which will let you install a larger PV system. It will also allow you install a fast charger for EV, likely to be your next car purchase, or soon after.