The best qualified professional that can develop a project for your future home is the architect. He /She has years of studies, he knows the architect forms and has an important knowledge of defining the best positioning schemes for a building plot related with the sun path. Underestimated influence of the sun over the building project in the future can bring many problems to the owners and people that will live in there. In general, for those who live in the southern hemisphere, the north face receives the most of the daily sunshine, the east face receives the morning sun, the west receives the afternoon sun and the southern face is the one that receives at least of the Sun.
The architectural project has to adapt, as much as possible, to take advantage of the most privileged positions in relation to the sun. Therefore, the sun will help to define the layout of the house, the openings, the elements of sun protection (brises, marquees, awnings …) and maybe also the position of the solar panels.

Source.

...