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.

I think the roof might be a bit too dark for the brick colour. The bricks and the window joinery will blend in fine. What did you decide to do?

Pictures would help...are you planning on getting a new roof or is it staying? If it's staying, is it tile, shingle, metal? And what region is it located?

Are there any rules to follow regarding choosing exterior colours, ie, someone once told me that there should never be more than three colours, regarding the roof, walls and trims. Building a modern monoplane roof house on the coast. Like the idea of either Gull Grey or New Denim Blue for the metal roof. The interior pallette will be whites, inky navy, greys. Drawn towards grey for the weatherboard walls or white, prefer a black door. Although this is a modern house we are trying to inject a bit of modern farmhouse decor inside. Any help appreciated, thanks