Comfort in the house should be planned at the construction stage. You need to properly design all engineering networks, because it is a guarantee of their reliable operation and your peace of mind for many years.
This primarily applies to the planning of the electrical network of the property. You need to plan in detail which devices will be used, where they will be placed, what is their capacity. Based on this information, you can choose the parameters of power cables, foremost - the cross-section of the conductor.