Yep but that's different issues completely with sounds, but it does comply with building regulations. Is it something you would want regarding sounds/ privacy, think it's a personal thing. If you where adding a new bathroom that wasn't there prior, then you would have to put in an extract external air fan that will change the air 4 times within the hour and comply with building regs, have to put plumbing in for a shower should you need it in the future, have activity space allowing it to be used by disabled people safely, but that's not the case here since the bathroom is existing.

I'd vote option 4, 2&3 don't appear safe (also option 5 with emptying things into the sink and just impractical). Using option 1 layout, could you have the kitchen along the length of the left wall moving the sofa forward a little, with a narrower coffee table, (and putting the hob and sink as far from sofa as possible). Put the dining table on the bathroom wall with a bench seat. Put a cupboard in the 500 alcove for a larder. You may have room a small chair next to the tv (one that doesn't visually feel the room). I'd make the opening to the courtyard as large as possible. Not sure how that would work as planning isn't my forte and I would strongly suggest engaging OnePlan or similar. I do agree with the estate agents advice though.

Hi vaivadr, I think a simple solution would be to put a quarter turn on the steps and then move the WC further back. That will give you a much more spacious entrance. In a small place like this you need to minimise the amount of corridors so I would make the corridor smaller and give more space to the kitchen. I would move the kitchen to the other side because you have much better option on that side with the much longer wall. I would use the space where the kitchen is now as the dining area with bench seating to save space, providing seating for up to 6. This will now allow you to open up the entire back wall with bi fold doors. Filling the house with natural light. I would add a long island with bar stool seating in parallel to the kitchen rather than peninsular as that will add to the illusion of depth to the house making it feel more spacious. The remaining area would be the lounge. This layout gives you a more usable front entrance and gives you a lot of flexibility with regards to your kitchen size, for example if you prefer a bigger kitchen you could extend it further into the living area and vice versa. It also means you are free to remove the back wall and bring the outdoors in with a large bi fold door, producing a spacious light filled home.

I’ve seen many terraced houses with the rear room and kitchen knocked through but without the side extension. If there are lots of houses like yours locally, it’s worth going on Rightmove sold prices and looking at the floor plans and photos to see how others have configured the space.