I cut out some rectangles then used a tiny square cutter to cut out the windows. I made a small amount of hard candy to pour into the openings.
I outlined the window openings in grey then did the entire door in white with grey rectangles on the wet icing. After they dried a bit I went over the squares and rectangles with white to look like trim and put a grey doorknob plate and gold bead for the doorknob. I set them aside to dry.