What is the actual width of current bathroom? The length of bed 1 wall is 4.9m, what is the width of current bathroom. Are your floors concrete or timber with crawl space underneath?

I'm not 100% sure on the width sorry, I'll be able to measure later in the week.

Floors are timber, with crawl space underneath!

Just a very rough sketch without knowing measurement width of bathroom. Shower over bath in new bathroom. With toilet at the end. Vanity on the bedroom wall. Built in robes, not a WIR, as WIR will take up too much space. The built in robes will also add sound proofing from bathroom and ensuite. What are the walls of the house made of? Brick or timber studs? Will await proper measurements and information.

You're a champion, thank you! This is pretty similar to what I was thinking. Means we could extend out the kitchen too... but let me measure and get back to you.

You will just need a skyLight installed and good ventilation installed for the new internal bathroom.

where is your laundry?

This looks SO GOOD!!! Thank you so much oklouise. The laundry is downstairs - there's a sort of half-floor actually I think I am going to make good friends with the spiders, but it works for now.

A couple of additional ideas. Depth of bay window not known but looks to be as shown

great ideas, siruskey

I thought the first floorplan worked well for the family and gave the children two 3m wide bedrooms, 500 difference in depth as I have shown it but this could be used for a linen cupboard and they would be equal to stop any future arguments about who has the larger room, they would have the same single bed format or QBs. The laundry could replace the Powder room and become a study or just removed, the powder room could be used for extra pantry space

The benefit if siriuskey’s design with master at front is you can build the ensuite first while still having the existing bathroom then use it while renovate the existing bathroom if u need to or simple keep it and add laundry in front of it or a 3rd toilet.

Thank you all so much for your thoughtful comments and designs! siriuskey I love your ideas :)

Dimensions: existing bathroom measures 3400 (long wall against the bedroom) x 2600, and the bay is approx 800 deep.

We don't need a laundry upstairs - okay making do with the one downstairs, I think. Could consider a little study nook, as you suggest - but would it be better just to keep the space open?

The wall separating bed 4 and bed 1 from the living area is structural and double brick, so keen to leave that where it is.

A quick question about your plan siriuskey - how would we deak with the existing bed 1 window?

It looks like we'd be pushing the wall between bed 2 and bed 3 back a fair way. I haven't measured distance to window, I should've done. But would this basically require us to move windows?

Anyone know how much work/cost would be involved in something like that?

Thanks for the extra info Jess,

Bed 1 is 4.9 x 4.9 and I have taken 1800 plus 100 for the wall, how far is the window from bed 3 wall?. Bed3 being 4.9 x 4.4 would still be OK for the master

The study could certainly be part of the living space, do you work from home, and I think you should always plan for a laundry upstairs even if you don't do it just now. Are your external walls, Timber. And there's no change to the load bearing walls we are only adding a wall for the ensuite /wir

Hello Jess, My first thought was to make the bedroom next to the living room the main and pinch a tad of the living for ensuite and robe. Door into robe by hallway and from there into ensuite so it would be on external wall with windows and fresh air and light. Do NOT do internal bathrooms: yes you put in a fan but never is as good as opening a window and every time someone uses an internal room you are paying for power. for it NO NO NO. I was also going to suggest skimming 1600 off the existing mast for laundry next to bathroom but if your happy with spiders in the nappies that is fine!! they do not eat much!! Go well, Cheers Margot