The floor plan is done by the Agent and are usually incorrect, any chance that you could check and show measurements, also which rooms are actually on a different level

my suggestions include a different location for bed 4 and master bedroom with ensuite and lounge at the front, old study is now laundry with optional extra powder room and keep the old laundry for MPR and toilet for access from the garden and subject to structural restraints the new family dining and kitchen as you described but there isn't enough space for a walk in pantry

Thanks for the advice.

I calculated the dimensions and attached, it's almost spot on from the real estate.

The laundry is the only room not floor level and is outside the house so I definitely want to bring the laundry onto floor level inside the house and extend the wall so it's in line with the rest of the house and create a bit more space.

I like the idea of the family/dining room, do you think there is enough space for an island bench in the kitchen + dining table + lounge etc?

And would there be anyway to have a wardrobe and ensuite combo together with a 1.5m width? I can't seem to find any photos for something similar on a search for a space so small.

I think I like something like the layout attached that has the least amount of work and has flow from the lounge room into the kitchen. All the plumbing is there on the right side of the house, and only need to put up 2 x walls to achieve below.

imo the biggest challenge/cost would be removing all those big solid walls, changing doors and windows and repairing ceilings and not the extra plumbing (new bathrooms and kitchen cabinets, fixtures and appliances cost the same regardless of the extra few metres of pipes) and a new location can make the most of the available space but it can sometimes be more cost effective to add an extension rather than attempting to squeeze too much into an existing building but you need an engineer, builder and plumber to give expert advice on site ... better not to assume that one option is better than another but collect a variety of ideas and ask for quotes to compare actual prices but do you have a realistic budget? i would expect to pay at least $50,000 for a modest new kitchen and bathroom in the same locations before removing any walls or adding an extra bathroom and new laundry and the combined ens/wiw is too small and would be better to have a good sized ensuite with biw and there's not enough space for a bigger island without compromising space in the family dining area...there are so many different options but we need more info...are there any good or bad views, what is the length and width of the block, is there a garage, is there car access into the back yard, what is the distance from the house to each boundary, describe your climate, where is north on the plans, how many steps are there from the back and front doors to the ground, does the block slope and in which direction, how much headroom is under the house and in the roof space...is there any potential for an upstairs, downstairs or an extension into the backyard?