You could do a wet room on the south end of the room with the tub and shower combined to conserve space. Window would go above tub, however with privacy in mind it would not be low as you have in your cad drawing. see photo. Vanities would go on the west wall with toilet on the east wall. I am guessing at the dimensions because you mention meters and in the US we use feet, but it sounds like about 9'x15" ? The location of the entry door really impacts the layout of the room, but it looks like it cannot be moved.

Just wanted to post the most recent plan that incorporates all of the suggestions that I have received from the very helpful people on the Internet! Changes made: - added an extra bathroom on far left of the house near kids bedrooms - changed the toilet/main bathroom to move the shower over to the toilet room so that we could have 2 separate kids showering at a time (without coming into our room - although that remains and option) - moved the door to the library so that it doesn't look into the toilets/bathroom - optimised the space in our bedroom by moving walk in closet and bathroom around. This modification even allowed us room for a tub in the bathroom a so thankful for that suggestion! Now we just have to find room in the budget lol Questions: - when you walk into a bathroom, do you prefer to walk into a shower (from the door) or into a toilet? What would you prefer visible from the door itself? Logically you are going to use a toilet 9 times out of 10 so you would think that should be there first, but there is something odd about walking past a door and just seeing a toilet there... Thoughts? - is there enough room in the 2 bathrooms we created by joining the toilet and main bathroom? Dimensions are 3m by 2m (roughly) and with a shower coming out about 1m and the vanity about 550mm, that leaves more or less 1.45m to walk around, surely sufficient? If there are any other suggestions or thoughts on what you would do if this was your home we would greatly appreciate the feedback. Thanks you all so much in advance!

Hi, Thanks for the response. :) I am following CCC Residential Suburban and Residential Suburban Density Transition Zone. It seems you can build 1m from boundary without having a window facing the boundary. I thought it seemed close, but if it gives me more space on the sunny side of the property then I'm happy. I wasn't sure how worthwhile it was me building interior/external walls into my design. I think a real draftsman would only use my dimensions as a guide and bin my project designs. I've only used the boundary line to design the entire thing, then used some Objects to give a visual guideline.

Here is a layout indicating some minimum dimensions for usability. I would recommend you go larger especially if two people are often going to be using the space at one time. This also does not account for window space or furniture or storage.