I think a parapet wall would be nice. You could have some form of pattern in the brickwork to make it more interesting. Im not sure if you'll like the idea but if you put in a 2ft or so (?) wall where the hall door opens in you could have the tv in that corner and then a corner sofa in the bottom right. It would mean changing the position of the bifolds though. Have you considered having a door to the utility from the hall? You could then lose the kitchen one and have an L shaped kitchen. Or if you need the door to the utility move it closer to the door from the hall. I appreciate it's a lot of doors but am just thinking of trekking back and forth with washing. Do you already own the dining table? What will you have between the family area and playroom?

I think the above comments are all really valid regarding sloping the roof of the extension and joining the existing and new with glazing. This is a really nice way to bring some light into the middle area - adding a window here is also worthwhile if possible if you are end of terrace. The Planners may allow you to have a view out as well as light as long as it is not overlooking. Your current lantern location also doesn't align with either the dining table or island, which may look a little off balance. Also remember to consider the location of any lighting so it doesn't clash with your glazing; pendants and spotlights as these will be what give you ambience and should provide atmosphere and task lighting. We did a similar project recently, extending an existing victorian terrace to house a kitchen/diner. We actually added flat roof lights along the long wall, giving natural light and views over the kitchen workspace and dining area. Would you like a half hour interior design consultation for some friendly one-to-one advice? We have a couple of slots each week for £125+vat. The consultation includes a friendly video chat to talk through your space and discuss your project ideas and needs. I follow up the video call with digital moodboards tailored to your budget, a layout suggestion and product recommendations. I will also follow up with a phone call.

Couldn’t afford stainless steel guttering and down pipes so settled for anthracite to match the windows and painted soffits etc to match. It cost a little bit more than black but we’re really pleased with the look of it.

I also like that colour door. I presume your windows are softwood if you want to paint them otherwise if they are hardwood just apply a finish such as SX70. That’s what’s on mine. Easy to maintain without painting them. I have a decorator out once every other year and a freshening up is all that’s required.