There are many inspiring photos on the website, just come and have a look, hope they can help you with something! Also, look forward to your opinions!

With your shower design you will need a shower screen to keep the water in. Is that your intent or did you want a design that avoids any glass? Why not simply add an entry into wir from the east side of bedroom.
Natural light is fine. You only want west windows that are up under the shelter of eaves or triple glaze them if you can. Can you show us the whole floor plan. At tv nook doesn’t look too functional

This is the whole upper floor- from the “tv nook” back is the original house.

The reading/play room adjacent to bed 2 is an enclosed verandah with a sloped roof- we are a little unsure about the TV nook space and whether to connect it to the reading/play room. It’s just an odd space because it’s only approx 2.2 wide.

I should say, this is the top floor only, and there is a living room and media room downstairs, so we don’t really need the space to function as a living room- our building designer just thought we needed some sort of open space at the top of the stairs.

You have potential for six occupants of the minor bedrooms. But, you do not have a separate toilet/powder room. So this will affect the efficiency of using the bathroom. With all the unused space, I'm sure you can add one into your design.

Regarding you master, I would cut 1 metre off of your new extension. Move bed 4 to the unused space. This will eliminate the hot west window in the bedroom. Reconfigure the entrance to the master suite. And redesign the WIR and ensuite in a rectangle area.
You don't need 6 metres for a king bed and side tables, and one doorway. 5 metres would be sufficient.

Thanks dreamer. We have another bathroom downstairs with a toilet in it so didn’t think we needed another toilet upstairs- we will think about that.

Unfortunately we need that extra metre for the downstairs footprint so can’t delete it. We will have a think about getting rid of the tv book area!

not really related to your floor plan but I note you want a double shower. not sure if you want this from experience or not. I considered this for my ensuite butI'm really glad in the end I didn't do this. unless you have a separate hot water system you'll never have decent enough water pressure for 2 people to shower at once and it can make glass openings really annoying. I wouldn't forgo double vanity for the world though (although you want to ensure you've got plenty of bench space).
just my 2 cents worth

I'm not saying another toilet, I was suggesting a separate toilet upstairs.

some ideas to consider

Thank you everyone- that has been really helpful- we are going to go back to the designer with these ideas and see what he can come up with!

One question i have with your design Oklouise is whether the sloped ceiling will look odd in bed 2? The house is an old queenslander and bed 2 was originally the lounge room, with two sets of french doors opening on to an enclosed veranda. We are opening up the front veranda but not the side one (because that would limit the floor space we have available to build in downstairs). The "reading/playroom" was kept separate to the bedroom because that space has a steep sloped ceiling and a set of french doors opening on to it so we thought it looked like a separate space. If we remove the french doors and knock down the wall, do you think the bedroom will feel strange? We would like to keep the set of french doors opening on to the verandah at the front of the room.

if the play room is part of the original structure then i would keep that to maintain the charm of the old building..from your original post we had to assume that the whole upstairs was a new structure and that may make all my suggestions unsuitable...can you share plans of the existing spaces with dimensions

Hi Ok Louise, see below the original structure- this is from the real estate listing so i don't have exact measurements. Essentially the new part of the house is the 6 m extension identified in the plans I originally posted which currently has bed 4 and the master/WIR/ensuite in it. Where bed 1 is in the original is now the main bathroom and the stairs in the new plans.

We aren't changing the footprint of the original house, just opening up the front veranda and extending backwards/ adding a floor underneath.

Haha, yes it will be SO much more roomy.

Oh- that playroom looks much better! Thanks so much :)