Can you post measurements. Just write them on your drawing and post photo

Is this your only bathroom and toilet in the house?
If it is, then, I would keep the separate toilet.

The drawing is to scale. Each square is 10 cm. the Toilet is 900 x 1500 mm. The other room is 2550 x 1850 mm. We also have an ensuite with shower, toilet and vanity off the main bedroom.

Here is the drawing with measurements.

I have a single bathroom for the kids and I. If that’s your only toilet don’t combine it. The kids take way longer on the toilet than you could ever dream. I also have a siding door. The door is a heavy solid door original to the house and I turned it into a cavity slider. Works fine for us.

we need to see the bathroom with all the adjoining rooms including the hallway with dimensions..it's never a good idea to change one room without understanding the whole house and, given the choice, a separate toilet is always better... can you post the whole house plan

Here is the full house. Not sure I got all the angles right. It is a split level home with the bedrooms and bathrooms upstairs.

Really clever idea OkLouise

Hi An,

We are in the process also of redesigning our bathroom and thought I’d just comment on oklouise’s design. We currently have a similar setup except a bit smaller and thought I’d mention considering the area for which you have to dry off. We found the walls just made the space too cramped when we needed to be in there to bathe and dry our kids.

Thank you for the feedback oklouise, dreamer, bigreader and Ros.
Putting the vanity in the place of the wardrobe could work and would give more space in the other room. But I am concerned about the vanity being seen from the front door (the diagonal section next to the kitchen) and, as Ros mentioned, the other room would still be pretty cramped if you are more than one person in there.
I think opening the space up and removing the walls would make it more spacious. I am happy to pay for changing the windows, fixtures, plumbing etc.
Any suggestions for what I could do with an opened up space?

I would keep the toilet separate. put in a little hand basin in if you can afford it, best thing we did with ours.

this looks like an 80's floorplan that we've seen before, vanity is OKL plan is built into the wall space so won't be seen from the lower split level entrance but you could add a door to close it off.

For more floor space do a combined bath shower space, Japanese style where you use the shower floorspace beside the bath to dry the kids off, looks good too

Using oklouise design. Remove part of bathroom wall, and install a door at vanity.

Can you see the back of the wardrobe, at the moment, when standing at the front door?

another variation..doorway pushed further to the right should help obscure entry

but, if the wall along the hallway reaches to the ceiling, a solid core cavity sliding door across the top of the stairs would help with extra privacy, noise and heat control

Try and reposition walls so you can use solid core cavity sliders (oklouise suggestion) where possible. In older homes (which I flip regularly) I do this to free up as much floor space as possible...something that didn't seem to be as important when these homes were built.

I think the latest design by oklouise makes the most sense and gives you plenty of space. Existing plumbing is mostly being used, you only have to install the additional plumbing for the vanities. You also keep some privacy for the toilet. I would also go for the core sliding door if possible. No worries about hitting the shower when you open the door.

Use a cavity slider for the toilet. I don't think a swing door is to code (BCA) in that space

If you don’t mind a long hallway then you could incorporate the “wasted” hallway space (just under 1500m2) towards your bathroom....

We had a very similar arrangement as OKLouise's first design, and it worked a treat when the kids were little. 3 kids, so one could be in the toilet, one could be cleaning his teeth, and one could be in the bath. The vanity being seen from the living area was not a problem - made me keep it tidy, and it was big enough to have a plant, etc to make it pretty. When the guys were teenagers, they would have liked a vanity in the bathroom to give them privacy. Then we understood why the architect wanted to have a cavity slider into the wet area... Cavity sliders are great for giving extra space, but not as good at locking as a swinging door.