According to the requirements of fire code, your balcony is at least 6 meters away from the house in the north. The specific spacing limit is related to the fire resistance limit of the building, ranging from 6 ~12m. If the walls of two houses are brick walls, the columns and beams are reinforced concrete, and the roofs are all wood structures, the minimum spacing is 8 meters.
In terms of lighting impact, each place has local regulations and needs to consult the local construction bureau.
In terms of sunshine, because he is in the north, there is no shelter for you, so it has no effect on you.
In addition, when they build a house, they need a red line map issued by the Planning Bureau. The plan needs to be approved by the planning bureau. You can know whether the procedures are complete, otherwise it is illegal construction.