If you need to keep the space open due to light levels, then shelves with an interesting display would work well, a glass divide/window can look odd on an internal wall, if you are not careful, although, depending on the rest of the house, the crittal window might look interesting too. Stained glass would have to look good on both sides and could be very expensive. I like the look of the climbing rope diy on the stairs, it might be worth trying that idea too. Please don't go with the fish tank, horrible expensive out of place smelly things in a nice clean home, they remind me of pet shops! It really boils down to what you like the look of best, if you really have to keep the space open, just don't forget there is nothing wrong with feeling warm in your home and there is more chance of that if you don't feel a blast of cold air every time the front door is opened, so don't rule out a proper wall if it at all possible.

Hi, I think I’d install some kind of sliding wall partition or double doors rather than a more permanent wall. That way you have more options - ie having the space fully open to have it lighter & to be able to see both gardens (while the Xbox isn’t being used) or closed when needed. I think I’d divide the space as it currently is with the current door into the office space. If it were just for an office, I’d put the dividing wall / doors just at the end of the desk but if you also want it as a snug, I think a bit more room would be useful. You could add another doorway from the dining room into the lounge area but that might cause problems with furniture placement.

Our original layout was a through lounge and dining area. I didn’t like it. I preferred to shut the lounge off and then knock doen the existing wall between the kitchen and dining area which is what we did so we have a kitchen diner all across the back of the house. We then put double doors between the dining area of the kitchen diner to make the lounge private. Closing the double doors keeps the lounge warmer in the winter but we tend to leave them open and only close them when we go away so passers by can’t see through from the front of the house to the back.

Hi! Can you please upload a picture of your attic so we can understand the issue and perhaps offer you a solution? Many thanks