I'd definitely get an engineer to look -- being 1920's I'd suspect that 'middle' wall is probably load bearing , so it would go from being a project to a challenge ( with the $$$ to match ? ) . There may be historic restrictions , and you'd need to check those , but my gut feeling is you'd possibly be better to lose the garage , park 1 vehicle behind the other , and extend the kitchen and lounge 'that' way -- it would still be load bearing and you'd have to take the entire wall out , but the actual strengthening would probably be easier . But that's 100% a guess .

moving the stair doesnt help the existing upstairs if your plan is to not change much. the living area would reduce from 3.5 to 2.5m width and would limit options unless you want to use this space as office/playroom. the existing door would have to be relocated to bed 1 and the green line is an existing beam which looks to be tight on the 12th stair down which is usually the minimum head height clearance.

Hello there, I haven't read all the comments or studied all the plans and variations but I would suggest the powder room with a shower downstairs be on external wall for vent: store rooms do not need it. Also have the laundry doors in center and opposite each other allowing for two straight runs of benching much better!! The kitchen look huge: maybe make dine larger. Upstairs have the study all open to stairs and void: a much nicer place to work. Why have the ensuite on the far end when it would be lovely for bedroom to look out and to have it closer to robe. Then too move robe door so you do not do laps round the bed to find slippers. long window is excellent for fresh air in robe too. I know you said it is a QLDer but which way is north and have you taken that into account to your liking, heating, cooling? Cheers Margot

The laundry has a door to the side of the house, and this is the entry that people use for the pool / bathroom run. The study area would be to work from home and would be more ideal to be in a closed off room to ensure have quiet for when in meetings etc. We are currently a family of 5, 2 older teenage girls 21 & 18(one moving out of home soon), and a young boy 8. Before covid we would have OS visitors once / twice a year for approx 4 -6 weeks at a time. The views are more south easterly. Our longer goal is on the deck area to the right of the pool will be pergola area with outdoor seating, BBQ area and a bar accessible through sliding doors into the bottom of the room far right. This room will be divided into 2 with a smaller bar area at the bottom accessing the outdoor pergola and the middle interior is currently a craft / hobby / small business room - and changes to a lounge area for OS visitors. I hope all this makes sense. I'm now looking at the potential changes for the family bathroom and laundry to be changed, this is a great idea, as yes I agree the family bathroom is very small for the house.