if you want to be able to open the doors, load the boot and walk around i think you need at least 9m x 7m but if you to also want useable work benches and storage spaces (eg for the lawn mower etc) add at least 1 m to width and length

What do you want in the ensuite? Double vanity? Double shower? Bath? If so, what kind of bath? A separate / private toilet? I think the answers to those questions will direct you to what shape room will best meet your requirements. But, in general, a long, narrow design seems to be the most appropriate, with the shower at one end, sink/s in the middle and toilet at the other end.

i would probably try for at least 90cm but depends on the size and shape of the room, location of doors and windows and size and shape of other fixtures..can you post a plan of the room?

Thanks everyone for the helpful advice. I assumed my layout would be similar to that of other Californian Bungalows of the same period. It is helpful to learn my layout is reasonably uncommon and I am probably looking for inspiration in the wrong places. It sounds like Dr Retro House Calls and JRED are correct in steering me towards an interior designer. I hadn’t considered that option as I thought I would need a large budget for furniture and décor if going down that path. I’ll give Bigreader’s suggestion a go first and use scaled cut-outs of furniture to play around with furniture placement. If I still need guidance after that, I will look into interior design services. I initially shared your thoughts – Melt in ACT - and was thinking about turning the laundry space into a large bathroom and then moving the laundry to the small bathroom. Ultimately it was going to be too expensive… and seeing as I have young boys who get every item of clothing they wear dirty within 5 minutes of putting it on, it will be a bit of a luxury to have a big laundry. It's an idea I might revisit in the future though. Oklouise, I love all your ideas and suggestions and am really grateful for the time you’ve taken to respond. The floorplan you’ve put together is super helpful. I was bummed about the lack of space for an entry set down area and would have never thought about moving the bedroom door. I will definitely look into that. Good memory siriuskey- I did previously post about this house and I received a couple of good suggestions (including advice from you) around maximising kitchen bench space with a kitchen island and adding a storage wall near the small living spaces. I felt the advice sought in this post is sufficiently different to justify asking a new question about whether there are resources I may not be aware of and if people have ideas about the floor plan as a whole, including spaces I had not previously asked about. I’ve got lots of new ideas and really appreciate everyone taking the time to share their advice. This is a great forum/ community!