Switch the front window and your side entrance door, this way your door is visible from the street. Then turn the window in the pantry into a door to gain access more directly to your kitchen, a closet and maybe a bench for gathering items on the way in or out. It looks like you have to go up a small flight of stairs to get to the door, otherwise I'd say put the additional entrance on the cellar wall on the left of your plan. Depending on space you may need to slide this new mud room entrance to the left and you might have room for a longer closet along the pantry wall and a bench opposite the closet along the outside wall. You would lose the cellar but I am not sure if that is another storage area or access to a basement. Just some ideas. Really like the rest of the layout. Hope my little picture helps to explain my ideas.

Thanks for suggestions so far. Unfortunately, adding a second toilet is not just possible unless I forego one of the bedrooms, which I am not prepared to do. Also, as with many terraces, the access to the courtyard at the back is through the house, and I wouldn't want a portaloo carried, or serviced via the sitting room. I have looked at all the possible options, and discussed this with several builders and bathroom designers, and other than shutting up shop here for 3/4 weeks, there is just no answer . . unless I don't disturb the waterproofing and keep everything in the same place and be happy with updating the loo, vanity etc. I am happy with the wall tiles, so it is just the floor that I would like to change. Thus the thought of tiling over what is already there . . .

I would re-evaluate my brief, my budget and my site. It is another case of trying to squeeze too many rooms into too small a space and compromising the living space. If you draw furniture to scale in your living room then you will see that it is undersized for a four bedroom home. With the best orientation going to the garage door and bedroom 4 I would look at a complete redesign by pushing some of the bedrooms to the rear, and a central courtyard to give you an opportunity for north facing light to a living room. There is nothing nice about the current design and will feel like an apartment with little resale appeal. The designer has shown no flair or imagination in this "gun-barrel" floorplan, and is a variation on a concept that has been around for centuries. But your biggest problem is the number of rooms. Do you really need 4 bedrooms plus a study and 2.5 bathrooms, a long wasteful hallway, and only one modestly sized open plan living area and kitchen on a narrow block? I would start again with a smaller brief and a designer who can challenge your thinking about what good small house design actually means. Small house design is the hardest to do really well, so don't use a large house designer. Dr Retro of Dr Retro House Calls and Dr Retro Virtual Visits

Thanks oklouise. Some great ideas here. I particularly like your idea of the "window" in the new powder room to let light in. Creative way to incorporate the vanity too. Thank you for your very thorough response and details surrounding tile thickness and other strategies to maximise space. Siriuskey, thank you so much for identifying alternative locations where we could squeeze a powder room. I hadn't considered these spots before. Not sure about the walk in - it is actually an extension from a previous owner, so I believe the wall you are borrowing is external/structural. Otherwise I think it's a great solution (even if I'd rather shrink one of the kids rooms than our walk in!) You've given me another idea - perhaps next to the kitchen where you have marked dining we could place something small. (We have been able to increase the "meals" area so this dining section is no longer as important as it used to be.) Alternatively, if we were to increase the footprint of the house, we could make a walk through wardrobe and include an ensuite for the master next to the porch, and then try to make hallway access to the current ensuite. Or convert the walk in into another bathroom accessed from the front entrance, and putting a built in into the master. Lots to think about! I really appreciate having new eyes look at our floorplan and hearing all your ideas! Thank you thank you