Try lots of pure white with one or two accent walls of midnight blue (or dark grey). Mix in some hot-yellow accents and you're done!

I reall like the current colors and your red roof. I think you can change the house colors and not change the fence color. Here is one example that is in a tan family: With a white trim and dark brown shutters, I think it would work. Here is another example of a tan shade: I also like this light grey with white trim: Would you consider a green base: Then chose either a brown or red for the shutter.

Hi, I know there are so many things to take into account and it's hard to get perspective from a photo. The white you can see is an extension with building paper, and the red is the existing building which is two story. The exterior is wide weatherboard planking, the windows are silver aluminium with very little trim. The doors in the front of the picture are French doors from bedrooms that will open to an enclosed courtyard ( yet to be built of course) The roof will be a light grey/brown but you won't see it much because of the flat roof style. There will be decking and ballustrades covering half of the new extension.

Thanks Courtney for the suggestion! Will grab of a sample of the colours and take a closer look. We like a Tranquil retreat or grey pebble but not really not sure about which tones is appropriate, especially if going for the loft/industrial look with black windows. Tried goggling red brick, terracotta roof, black windows and couldn't find much.