The entry hall is very narrow. I’d look at flipping the study and stair over so you can combine the hall with the garage hall. You would then have the study as entry to master suite
But I think that’s a better compromise. There are other options to resolve this I’m sure.

I'm not a fan of northern covered alfresco areas in most climates. As they shade the home from northern light, & sunshine in winter. An appropriate length eave is a much better idea. Letting in much more light, along with winter sunshine to warm the home, while shading the home from summer sunshine.

You have north facing living areas, but as it stands, only the family room will receive northerly winter sunshine. Perth gets pretty cool in winter time, so you could certainly benefit from more sunlight in the home - 1sqm of sun on the window creates around 1kW of heat, this is a significant figure.

So I'd redesign the alfresco area. wrapping it around the kitchen, to the north & west. The western alfresco will help protect the kitchen from the hot afternoon summer sun. I'd consider shutters, vertical awnings or plants on the western side of the alfresco, to protect it from that got western sun.

If you do this, & just have an eave to the north of the dining room, this room will be much lighter, & your living area will be much warmer in winter.

Read more about this - called passive solar design - on this great government website,

https://www.yourhome.gov.au/passive-design

Oh, & talking solar. Australian houses should really be designed with rooftop solar PV in mind. This is often not the case, where hip & valley roofs are the trend - lots & lots of tiny triangles. Inappropriate for solar PV panels, & quite unattractive when covered with ill fitting panels.

So I'd think very carefully about your roof design. Aim for a good sized area facing north (or east & west).

I'd also consider cooling breezes. Which direction does the Fremantle doctor come from? South west maybe? Read about cross-ventilation in the website I linked above.

Kitchen could be heaps better - it's a dated set-up - I'd be trying for a more flowing configuration with an island bench. Make sure you get furniture shown on your plan so you truly understand how the spaces are working and scaled to function - you may find you don't have as much space as you think, or more than you need in some areas, or certain doors/entry point are awkward and need adjusting - the Family area likely tight with certain size lounge furniture but also you may not be putting much in it since you have a theatre room. Suggest the alfresco flows better from the kitchen - think about paths of movement between indoor and outdoor spaces. Agree with comments above re the tight Entry/stair (way too small for the size of the house) and the darkening of the Dining space.

Take your time and invest in getting the design resolved and refined

Best of luck PD

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You live in Perth so why isn't there a shower room downstairs for a future pool, agree with Paul kitchen needs reconfiguring It's a lovely big home that would a great home with some rethinking

Thank you all for the suggestions! Some great food for thought. A common theme seems to be the entrance is too narrow, it is 1.4m at the entry and 1.1m at the stairs - how wide should it be?

If am reading plan correctly, the robes are 450 deep (excluding door). That's slightly less than what we have in our 1980s home and I find them too shallow for hanging clothes well. Suggest deepen so have at least 500 (550 even better) hanging depth. Less of an issue in WIR if you don't mind hangers extending beyond upper shelf.

My suggestion is inline with ddarroch. Remove alfresco from north side of home. Replace with retractable blinds to control sun.
Install a gable roof alfresco along the west side of home. Redesign the kitchen to access the west side, with a servery. Still keeping the main access to outside on the Northside. Agree, put a basin in the toilet upstairs. Make wardrobes deeper. Suggest 600mm including sliding door frame.

The stairs, for such a big home seem cumbersome. It is all to do with space available, but the simpler the better. It seems the entry/stair area is compromised. Attached is a bigger and safer stair set up.

I just measured our hallway. We have a 1200 door entering and a stairwell off the hallway. It is 1500mm wide the full length. I would not like it to be any narrower.

The fact the hallway narrows as you move in is not inviting. There is no space for a hall table and the entry to the stair which is a busy junction is narrow. I see lots of finger marks and even holes in the plaster opp the stairs ;) definitely underwhelming for size of house

Flip the upstairs bath and shower (move the window with it), as the corner of the vanity would be right next to your head when relaxing..

Some quick suggestions:

Slightly re-jig powder room (add shower?), pantry and laundry. Add a tiny window to the theatre, move doorway (might end up with better sofa placement options in family room). And make sure you can look out into the garden when preparing dinner, kitchen as the heart of the house? Remove the void in your staircase and add some cms to the hallway, a house this size deserves some grandeur.

The other challenge I see, is the access to laundry from bedrooms. With the compromise of the hallway and stairwell in size, if this gets sorted, can a walkway be introduced from entry hall to laundry. Maybe through study area. Then access would be direct from stairs and main bedroom, without having to go through dining, living, kitchen area. It's just a bit of a bother with double storey. If enlarging or moving the stairwell, this then affects the upstairs....mmmmm.

Out of interest, are you building with double brick and concrete suspended slab? I'm in Perth and built our double brick, double story home 5 years ago. I see there is more brick veneer/thermal cladding being built now. Also buildings without a concrete suspended slab, and now wooden and steel. Just interested on your thoughts.

unable to read the dimensions my suggestions are based on approximate sizes with the wider entry foyer and minor upstairs variations inclduing a laundry chute and study nook.. ...there are several options for outdoor living areas and a pool with change room, shower and toilet ... less overhang for the family livinga areas with a much simpler kitchen...adding furniture makes it easier to understand the spaces ...the gable roof over the family living and alfrescos could have raked ceilings and the rest of the roof is a simple hip roof and there are no small projections (eg the laundry?) that would make construction more complicated and expensive

Missing the lower level ok?

I would put two basins in the family bathroom .