I like option two. And is there a way to add a teeny basin to your existing separate toilet?

Oops I missed that on the plan yep we have a teeny basin in the separate toilet ( and the associated water that goes everywhere when kids wash hands!)

The 900mm skinny en-suite is way to narrow, you’d be getting out of the shower and banging into the sink.

How about moving master to living and incorporating entry into master. New entry into new living.
Can you add dimensions to your plans

ignoring the built in wardrobe, what is the length and width of the master bedroom, what is the distance from the corners of the room to the sides of the front window alcove and from the outside of the wardrobe to the entry door and we need all dimensions in cms not sqm

Thanks all for feedback so far. I’ve got some measurements below.

Like Kate, I say swap Living and Master and then either incorporate an en-suite inside the existing room or push out your current toilet and bathroom to be in line with the current living room and for two bathrooms and the toilet into that new space.

I’ve looked at swapping the master and living and seeing if we can build another ensuite in there, the issue being we only have one window in the living, so pushing out the current bathroom and toilet to fence and building an ensuite blocks up this one window for the room( note the living room is built on the boundary with neighbour)

I say option three and promise your wife that when the girls leave you will either renovate back to the single room or turn bedroom two into an ensuite . Another option is to put a very large mirror in the laundry .

I would forgo the ensuite and retain the fireplace that's a big selling point. work on making the current wet area more workable, even pushing this out to the boundary leaving a light well between the living window, WC and new extended wall. I couldn't see the depth of the bathroom?. Not knowing how you would access plumbing but you could consider adding a vanity to a couple of bedrooms as I have seen done in the past in older homes to help with the overload of having 3 daughters. rough example without pushing the wall out, if done this could have a sloping glass roof depending on the aspect and privacy

Maybe this

Sorry leaving window

I'm really liking siriusky suggestion.

put a vanity basin in the bedrooms.

put a timer switch on the hot water, that may stop from having long showers, or divide the electricity, gas and water bills by 5, and get everyone to pay.

you said the water source runs along the bedrooms, so having a small basin in the bedrooms is a good suggestion.

lots of great ideas to consider but i hate to tell you that the the room is already asymmetrical with the wardrobes and, preferring to avoid expensive changes elsewhere, i would add a deeper ens to suit a 1200 deep shower and use the chimney alcove for a vanity without changing outside walls (although you may need to consult an engineer for advice about the best way to change the chimney) and if possible/necessary move the bedroom entry door (is there a little wall space between the bedroom door and the wardrobe?) and use odd sized side tables to embrace the aysymmetry... i think a 90cm x 90cm shower will annoy you more than the aysmmetry so a 1200 x 900 shower cubicle, wall hung vanity and mirror doored wall cabinets (wall hung vanity allows floor space for waste bin, scales, slippers etc and makes the room look more spacious the toilet end has enough width for tall narrow storage for towels etc and no problem hanging towel rail (or even a grab rail) on the wall with the cavity slider as it can be reinforced to suit during construction and consider a frosted glass sliding door and solar skylights, proper ventilation and underfloor heating for some extra comfort

I agree sinks, bedroom, children carpet...not great combo,

OkLouise- we initially looked at an idea similar to what you have put here, we actually have a length of 3800 as opposed to 3400 noted in your drawing so can fit a 1200x 900 shower in. what do you think about narrowest walking space between bed and ensuite wall? (We have a king size bed)

There’s no way I could contemplate basins in my kids bedrooms. But I do alleviate bathroom traffic by the tweenager having a grooming station in her room - mirror, drawers and products.

the narrowest walking space would be about 60cms (and there won't be a lot of traffic in the space and with 3800 (not 3400) the ens doorway can be pushed towards the front of the house, not centred and makes more standing room in front of the shower and easier access from the bedroom to the ens but also depends on the distance from the new wall to the side of the bay opening and that was probably centred when the house was built and before the wardrobe was installed so you need to carefully measure the room again... we now have three different widths for the room and the hall is shown as metres wide!!...is the master bedroom 3400 or 3800 or 4460 wide (ignoring the bay window) and what is the length of the whole room (ignoring the wardrobe) and what is the depth of the wardrobe from the outside and also measure from the outside of the architrave around the bedroom door to the front of the wardrobe ..could you gain some space by moving the bedroom door closer to the wardrobe and/or hinging the door to open towards the wardrobe to feel less cramped? ...we can make lots of suggestions but need to start with precise information about what you already have and based on new information and the size of an average king sized bed and the wider room my suggestion would be to place the bed in the centre of the room, lined up with the centre of the bay window and then measure how much space is available on either side for the ens and for wardrobe and bedroom door and you'll probably find that even if the bedroom door is moved there would probably be about 60-70cms between the bed and the new wall and minimal space between the bed and the door on the other side so try losing big bedside tables and use hanging lamps and mismatched side table or shelves ( a cut down stool makes a tiny side table) and keep in mind that, unless you remove the whole chimney (big job but will supply a huge number of bricks if you need some paving) the thickness of the brick walls will decide how much space is available in the chimney alcove for the vanity so measure inside the chimney not outside wall spaces but, despite limitations imo the ens is well worth the effort, cost for the improved resale value and quality of family life.. but, why not move the bed and add something to create a barrier to represent the proposed ens wall and see how it feels as something like this could work but depends on accurate measurements

FYI, Vanities in bathrooms can be a great addition, The Basin must have an overflow and if necessary you can tile the floor in front of it. The following examples show some great ideas

https://thesethreerooms.com/bedrooms/basins-in-bedrooms-pros-and-cons-of-this-design-feature/

Sorry it would be the first thing I would rip out. Have seen them in old houses and thought 😱

Old basins in old houses I would certainly update them for today's living, space available and if needed to lighten the load on a bathroom, choices

Looking over your floor plan, I have placed furniture to show how tight the Kitchen family space is ie: the distance shown between the island is under 900?, I have it at 1m but still too small for a family of 5,

I have split the family bathroom showing two ideas, 1) with a WC vanity and shower , and the other with WC, double vanity and bath with shower over, this gives the family access to both WC's

2) I have swapped the living room and master giving the new master access to the WC, shower and vanity as an ensuite,

Both show King beds

This second layout means changing the entrance via the living room with Fireplace and Bay Window (not shown) This room is so much better used as family space which could have extra storage plus a desk and allow light back down through the passage way having removed the dog leg.

I have added an extra space at the end of the laundry and fridge for either a desk or extra linen storage

I have also shown how a vanity, Desk would fit into the girls rooms for doing, hair, teeth and makeup with a large mirror above the vanities (not shown), All of the vanities would be over flow vanities You could tile under the desk and vanities

Thanks for all the suggestions - I definitely think the easiest path is to split the large bathroom- just an uphill battle - and don’t want to lose the bath! Like the idea of swapping the living and master bedrooms as well. Definitely no to the vanities in the bedroom

#1 You could shift the laundry next to the bathroom utilizing its plumbing, then move bedrooms 2,3+4 towards the kitchen - subject to load bearing walls. (kids to vacate house for a month, yay!)

and use the space for ensuite.

#2 Do the Lounge swap if the boundary wall is not an issue

Put the ensuite at the east end, then enlarge the room towards the front and maybe replace front door with a bay window if wanted.

Create the new front door facing north or west, whichever works better.