Learn Sketchup is on my to do list. I use the IKEA and Reece online tools, which are good for quick mockups to help visualise the space with basic 3D rendering, but they can be a bit buggy and of course only have their own products to work with. I use Illustrator and photoshop for quick plans and mockups too, but only because I have a graphic design background.

I should say that It is an existing house from the early 1990s which I would like to update. Thx

Thanks oklouise! We'll try and get most of it together, then pass it to you for comment. I'd just like to mention that we will not be altering the footprint of the extension itself, except to remove two non load-bearing walls that currently comprise the passage. The intention is to open it up into one large space, with two separate zones - kitchen + relaxed diner-type dining area. The biggest change so far has been the removal of the old woodstove alcove and exterior chimney in the kitchen. It was in a bad state, leaking and leaning to starboard! Sadly it had to go. However, if we decide to keep the kitchen where it is, the wall it stood on will give us a blank canvas and some wriggle room to work with. The alternative plan is to move the kitchen across the hallway and into the old dining zone, the objective being that we will later re-fashion the current bathroom off the dining area into two zones - a walk-in pantry + a separate laundry. Since we are not going to make any dramatic changes to the existing extension, except install new windows and doors, Council and a draughtsperson are not really needed. Our aim is to gather as much inspo from the kind people here, as to what will be the best layout in both zones to suit our needs. This is the biggest issue we have faced so far! We can't seem to agree which side of the extension the kitchen should go, and the best footprint/layout in this area. Until we get that sorted in our heads, we cannot position the windows or doors! I will take some pictures of the extension to give you a better idea, together with the dimensions and positions of windows and door. We plan to install a double French door off one of these areas, and have a full glass door which we'd like to use as a back door - so this would need to be incorporated into the plan. I had thought about positioning it where the old wood stove had been, but since that's on the west side of the house, it gets extremely hot in the afternoons. Give me a couple of days to gather it all together for you. We'd be so thankful for any input from yourself, and others. Design and layout are toughies! For the most part we are aiming for a "de-constructed" type modern farmhouse kitchen where less is more.

Can anyone know of an app that I can upload my home photos but use their flooring, windows etc to design my renovation. I don’t believe this app does that, however the pictures are amazing.