I would shy away from black but there are a lot of great options using other dark paint colors. Some ideas would be: a dark gray, navy blue, and dark green. These will not have the austerity of black but they would give you the same look.

No , add shrubs on front of it and concentrate on the landscaping instead.

Since you are redoing the roof, your choices are almost endless. I think it will be somber in black and could be so cute and stand out with so many different choices and a dark greyish/black roof will be the easiest to work with. Add a crazy, bright colored front door for even more impact, but keep to a soft shade for the house....there is a lot of roof and you need to balance the dark with the light. Enjoy your new home and it will stand out even more when you add a garden down the road.

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A black house will only be problematic. The sun will bleach the colors differently, based exposure in the course of a few years. If you want a dark house, consider a medium gray.