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answering your questions: change the sliding door to a bench height sliding window and use the salvaged sliding door in the western end of the dining room where the best entry position is for the deck, you MUST have a proper legal drains do not consider anything else...the drain pipe for the garage laundry can be on top of the concrete floor, behind the washing machine and through the sink cabinet and/or under built in storage and only needs a few cms not a whole floor and no stepped up area that you would see or trip over.. the laundry can't be in a separate room as there's not enough space for a separate laundry without compromising the size of the garage...a laundry cupboard 80 cm deep is enough for the washing machine (allowing for the drainage pipe) you could use the old line cupboard to store anything you want but it's not cost effective to change, the entry foyer is already as big as in many modern homes and there's generous flatpac biw space in the small study.... the family bathroom is 2380 x 2370 (ie the old study minus 1m for hall way and wall thickness and, arranged exactly as shown to allow for the wide window there should be space for a bath up to 1800 x 750, vanity about 1200 x 500 and shower space 1200 x 800 and leftover space makes the small linen cupboard with the door deliberately opening towards the shower to use the back of the door for hanging racks for towels and clothes....btw i understood your priority was maximizing separate sleeping rooms and minimising costs...my last plan has five separate sleeping rooms plus the lounge with sofa bed totalling sleeping places for at least 10 people plus the potential for bunks in the garage so you need to decide what is most important and where you're prepared to compromise

always about compromise and if the laundry window is reinstated in the original location that restricts options for tall storage so i've included a skinny sink next to the window, a stacked washer and dryer and left the rest of the space open to use for overhead cabinets and/or shelves, tall space under wall cabinets for broom, ironing board, vacuum, baskets etc and hooks on the window wall for work clothes and dog leads...any custom built cabinets would be cramped and very expensive so use the open floor space for storage without doors...the location of the back door opening and doorways from hallway and front entry would also make it too cramped for the narrow cabinet that you wanted unless you make the laundry and powder room too small for the cavity sliding doors so, with so much extra kitchen cabinets for pantry storage (eg between fridge and stove or island drawers?) why not use the central cabinet for your mini office and keep the original wall between entry and living would save demolition and could allow a location for your sideboard.. striped wall sections show dog gates without doors and under a sofa table would make a great nook for the dog beds

Hi Zena, IMO, the wall colour and floor tiles are still in good condition so you don't need to renovate it. Your bathroom has a very good shape so if you like Scandinavian style, consider adding a timber cabinet to make it a focal point for your bathroom, and simply add a rug that matches with vanity colour to increase its look. Changing from a traditional mirror to a led mirror to lighten up your space is another good option. You can give your powder room a completely new look by using a in wall toilet, it will help your room look wider and more modern. Looking forward to seeing the photos once this project is done.