I'd go slate..if you're going to go light render..it will contrast nicely.. light roof tiles tends to date.. cloudpants the second house look gorgeous..

Can't go wrong with charcoal in my opinion, love it. Classic colour.

we need to have a better understanding of the current spaces...do you have a floor plan of the original house (usually shows lines for the roof ridges and valleys as well as measurements)...also need to know the height from ground level to the bottom of the gutter on the original house and the height of the wall from ground level to the underside of any existing gutter on the "outhouse" (quite confusing 'cause where i come from an outhouse is usually a "dunny" or outdoor toilet!) is the ground between the house and the outhouse level, how many steps up from ground into the house, is the floor of the courtyard already paved? is the floor of the outhouse level with the courtyard or a step up?...please advise the length and width of the outhouse and the distance from the house and any side fences...the attached plan is an approximation that needs accurate dimensions but most most important is the heights above the ground

Apologies this pic is with the undercoat only. Here is the white brick. thanks.