I have 3 questions about your space, Do you want external access for laundry to back yard? Is there a window/external door in there? Could the bath be just a nice galvanised tub/large plastic tub/baby bath that hangs on the wall until needed? (Filling & emptying it happen in the new shower with flexible spray arm???) My first thoughts are to keep all the plumbing across back wall (if no door planned) and move the entry door to the linen cupboard on right hand side. Then make linen cupboard on left front wall and accessible in part from both sides ie. bulk towels etc outside upper wall access (behind shower) then laundry basket & other storage is inside access, How about a modern shower which is 13-1400 mm square (same position as current layout) with a 7-800 mm glass door on left and a tiled 600 mm blade wall on the back right hand side which the laundry stone bench butts to (window over?) Leaves 18-1900 mm length on back wall to accommodate the tub/sink and washer dryer. If you place the washer/dryer under the bench and a 500 mm wide storage cupboard you gain a greater bench area for sorting etc and wall space depending on window for shelves, hanging rack etc. If you really want a bath Decina have a corner model and a rectangular to fit these dimensions and then you would need a shower screen (will this be the only bath?) With the door into this room on the right it creates the better flow straight ahead to the laundry and left with some privacy to the shower/bath. The linen cupboard is a good size and you could have a hatch on the outside right to the laundry basket inside which could even be on wheels in a recess/niche. Hope this makes sense and helps a little. :-)

i'm so pleased you like my suggestion..i much prefer separate toilets especially when there's just enough space for a tiny handbasin and pretty mirror...and, if renovating was easy it wouldn't be so interesting! In a similar situation we removed the timber floorboards, installed new plumbing, added cement sheeting over the wooden floor joists to meet the old concrete slab, installed the new walls, installed the new electrical wiring, waterproofed the whole floor and then tiled...a chat with a plumber, electrician, tiler and waterproofer BEFORE you rip out anything is always worthwhile. I think the odd windows add to the interest of what you'll have converted and i'd keep them as is...The savings for not changing the window could easily pay for your new vanity or all your new taps or have you considered under tile electric floor heating?...we look forward to progress reports

correct measurements are the only answer...for your new floorplan you need a room (without any restrictions that would measure at least 2400mm x 2000...it's always possible to squeeze in some minor variations but only if it's worth the cost in convenience, improved value of the property and actual cash outlay.... the front door entry foyer would be lost, the new bathroom doorway wastes more space, the linen cupboards would be too narrow for anything except a few towels and sheets (that can easily be stored in a suitable vanity or bedroom cupboard) the bathtub is gone and you would have spent about $20,000 for a bathroom that is not better than what's already there?? ...the computer programs that we use are called 3D Home Architect and my version 4 is no longer available to buy but i believe siriuskey may have purchased her version recently? these programs do make the plans much easier to see but you must start with accurate measurements and an understanding of spaces needed ...start with a space about 800 x 800 mm for a toilet, 900 x 900mm for a basic shower, 500 x 900 for a single handbasin 1500 x 500 for a double handbasin then add in at least 900 x 900 for a doorway (including space for the frame and space to walk through...same for cavity sliders!) and then you'll need space to walk around in front of the toilet and shower and handbasins ......unfortunately with the plumbing and space restrictions i don't believe it's possible to do more than widen the existing shower space by rearranging the entry wall.(NB you'll still need to spend $5000 to $10,000 for demolition, carpentry, new waterproofing, tiles, shower, vanities wall cabinet, taps, plumbing etc..forget the linen cabinet and store linen in a new vanity and toiletries in a wall hung mirror doored cabinet and keep some width in the entry foyer (minimu 1200 wide) ...removing some of the non structural wall in the kitchen should be the cheapest improvement for the kitchen and add space for a small breakfast bar but removing the end counter would lose valuable counter space that could also be used for a pantry ...before making any decision you need to think about the reason for the changes...are the bathroom, laundry and kitchen in need of immediate repair, is the unit for your own use of needing improvements for rental or resale...?? always happy to draw up your plans but have to nag again about the accurate measurements...try measuring each separate room (ie shower, toilet and vanity, laundry and storage from wall to opposite wall in several places in both directions, ignoring all the fittings but include separate measurement of the diameter of the hot water heater.

Thanks siriuskey for your design and comments. A bit of background would no doubt be useful, so apologies for this late addition to the discussion. The house will accommodate a reasonably fit and active retired couple in their 60s (us!). We have elderly Mums and expect that 1 of them will end up moving into the guest room/study (hence the desire to have a connection between this room and a shower/WC). We'd also like to be able to access the backyard and have visitors able to access the WC - although we accept that at times we can't have everything...although it's worth a shot! We've struggled with the layout of this space for some time now and picked our builder's brains, but so far no-one has been able to come up with a solution. Both oklouise and you prove that other options are out there.