I like what you have done i this bathroom, there is only one thing that could have been done better and that’s the position of the mixer tap for the shower. You should have access to it without getting wet , so it should have been positioned on the back wall closer to the towel hook. So you can turn it on and wait for correct water temperature before you get in.

Thanks everyone, sorry for the late reply, we have been away. I've measured the distance in the proposed bathroom from the walls to the sides of the window architraves on the 3420mm wall - this space is only 620mm each side, so too narrow for as shower to be run across. It's also 900 high from the floor. In regards to the light over the staircase - let's just say that one of us thought it was too low all along but you know, happy w.... you get the idea. We might re visit that hopefully. That said, I've installed step lighting in the stairwell to compensate. Really great to see some new ideas we haven't thought of for the bathroom though! My concern with yours @oklouise (in adition to the window now interfering with the shower) - is the room with the bath/shower going to be too small? I love the idea of having seperation from the bathroom and the toilet/vanity, but it feels like it would be back to being a couple of tiny rooms just like the current main bathroom is, and for the size of the house, we were hoping for something that felt larger and more spacious, with lots of light. What are your thoughts?

K_jossie, there's some really helpful suggestions here. I can't add much in terms of design ideas, but in a small kitchen that serves a family it's vital to maximise storage, Have a look at some of the more novel ideas for extra storage. You can put drawers in kickboards for things like baking trays, serving trays, shallow casserole dishes, serving platters you don't use often, etc. Loads of space there that usually goes to waste! Another idea I saw that I thought brilliant was making walls into shallow storage. Where you have a blank wall that it isn't practical to place cabinets against, and you don't plan to put furniture against (such as along corridors or walkways), the lining can be removed between the studs and shelving inserted and sliding or hinged doors fitted. It provides shallow storage that is brilliant for things like canned and packet food, cups, glasses, and some of the utensils that we typically like to hang in the kitchen. I also saw this method used above a child's desk area, using the in-wall space for storage of art and craft supplies. I agree a slideout pantry is a fantastic idea. I had one in our last house and loved it. It provided loads of storage in a very small space. The other way to maximise storage is to use drawers extensively instead of cupboards. When designing my kitchen, I made a list of things I needed to store and designated their future home on my plan, working out both where they were most accessible when needed and also the optimum way to structure storage space to hold everything. It's amazing how much difference just varying drawer depths according to the height of items to be stored in them can make. Best of luck with your extension. I hope the result is pleasing.

You need to have a go at it yourself and post your ideas. We can then comment and suggest improvements. You need to consider the dimensions of the space and dependent on those you may not have room for everything on the list so decide on the priorities.