I should say, the new Windows and stacker doors will be Aluminum.

The black will look great. I would def do all the extension in black and if the whole house is having the same feel then all the new windows too and save to do the front ones eventually. But if the existing section is a diff style then go with what suits. There are no rules and no one will criticise or probably even notice if they are in diff rooms.

Thanks Kate

I'm of a similar thought -- the new addition in black looks smart , and suits the style . I'd be tempted to do the fixed window in the first pic ( the dining area ) in black too , preferably by replacing the existing window , but possibly by painting as a budget measure -- it doesn't look right to me , either from the outside or inside , whereas the smaller windows in the lounge etc looks fine in white -- almost what is expected .

I'd stick with white for the gutters and eves too -- the dark roof and dark brown bricks would look too bulky with black or charcoal or brown or any dark colour IMO -- it needs that light coloured break !

Thanks very much. Agree, I think we will go black for the entire back wall of the extension (doors and Windows) and keep the smaller windows in white. We will do/keep the rest of the house white. That way there will be consistency on each wall from the outside. We toyed with making the small Windows in the extension black. But it seemed to much with a black fire place and TV.