Perhaps you could make the front room a bedroom, with split your bedroom in two to create a second bedroom, then create a large open plan kitchen - diner - lounge through the middle, and put the bathroom at the back where the current second bedroom is. That way you get 2 bedrooms (second bedroom would be a bit bigger than the current one and in a better location), plus the whole space will feel a lot bigger. This is just a suggestion based on how I would alter it if it was mine. But it's your home so it needs to work for you! I always recommend that you start off by defining your vision for how you want to live before designing the floorplan. A good taster of my recommended way of doing this is with my free Design Your Home Vision Checklist. You can get that here: https://www.i-architect.co.uk/dyhvchecklist.html For helpful videos watch my YouTube Channel here: https://www.youtube.com/@iarchitect Best wishes with your home redesign! Jane chartered architect, eco-home and conservation area specialist www.i-architect.co.uk

If the second bed doesn't need to be so big, swap the bathroom with the box room. You'd need to lose the utility but would keep a nice big kitchen. If the budget allows, you could widen that room to line up with the living room wall. That'd mean a new kitchen which may be a stretch too far but the symmetry might be pleasing!

I'm stumped. Can't see how to do it well. So offering an alternative, though you probably already have this as a back up plan. How about dividing a room with furniture and curtains? Ikea do a sound absorbing curtain (mixed reviews) and googling "bunk bed room divider" finds some interesting images, also shows there are lots of people trying to give children their own space in a shared bedroom.

@katlucy it's a good point - a window/door in the bedroom rear wall could be nice. yes - the door at the bottom of the stairs is a cellar. There is garden access from the kitchen only and a side gate. I suppose my greatest priority is creating a more cohesive living space, hence the thought to create a living/dining room and then make the bathroom a bit bigger with its own entrance off the newly extended hallway