1- open kitchen to dining

might not be simple if that is a chimney in the room above it. Don't worry about mess, design in storage for clutter.

2- Also thinking of opening up water tank area for an en suite to bedroom 2.

Combining tank room and bathroom should give 2 decent shower rooms, bit tight for bath though.

3- I would like to move the toilet in front of the utility as the smell will come into kitchen. Thinking of moving it next to study where current pantry is and open the door for it from outside and close it from kitchen side.

Good idea.

4- please consider the direction of the house and are there any more ways to get more sunlight in as the garden is west facing.

Could study and dining swop, SE morning light over breakfast?

5- can the eaves be utilized creatively in someway?

any other ideas ?

1. Its depends on the lifestyle you Will be comfortable with, just because open plan more spacious and in trends doesnt mean everyone should do it, for people who likes to cook complicated dish with strong spice smell I often suggest to have close kitchen as the smell Will linger on your fabric furniture if it were open plan

In some case I suggest a blurred glass sliding door as partition so it can be open plan to entertain guest and closed whenever you need

2. I would suggest to extend the current ensuite space, creating wall from the small window in bedroom 1 to the small window in bedroom 2, then divide it into 2 new ensuite

It Will make more proper sized ensuite

3.Agree to move the WC beside study

4. If your garden faces west, that means the house would get sunlight in the afternoon and early evening,

Install more windows or larger windows on the west side of the house, use lighter tone of paint or neutral colors to reflect the light and help it bounce around the room more effectively.

Install skylight on the top floors and if possible consider 2-3m x 1m interior window or glass block on some upper part interior wall on the ground floor to let the light pass from room to room

If you want to swap the dining with study you can, however consider that the new dining room Will be much smaller than study however if you proceed with this plan better move the current kitchen door facing the current study room

Second option is to swap the current sitting with dining

Third option make the loo under the stairs with access from corridor and open up the current pantry to make open plan kitchen dining

Fourth option If you plan to have shower on ground floor you can extend the loo under the stairs to the new study room to create proper size bathroom

Fifth option you can make the loo near the entrance door

5.depends on the eaves ceiling heights, it can be utilized as narrow ensuite although Will need new plumbing which need quite budget, small office or WIC

If the ceiling height less than 180 cm then you can utilizes it as build in cabinets or storage

Couple of questions please:
Is there any garden in the kitchen side of the house?
Do you need six bedrooms and would you be open to moving the study or laundry to a room further up the house in order to make more downstairs space?

@Jonathan No, there is no garden in the kitchen side of house, there is garden at the back. We dont need six bedrooms but thinking of making one of the rooms for music instruments and practice. what is your idea ?

Just an update guys, we are thinking of adding a 4 meters single storey extension at the back for the complete width of the house with roof lantern skylight and open up the kitchne and dinning area to the new extension. Now I am confused where to place kitchen , dinnig area, utility and ground floor toilet.

Alternative to the full width extension (so a better living space. Less square footage, less steel and less cost.