How to wire a house for a smart home

Modern, bright living room with plush taupe sofas, glass coffee tables, large windows, home automation. A fireplace with abstract art above, two chandeliers, and a piano in the corner overlook a green garden in Cobham Surrey.

How to wire a house for a smart home: where cables should go, Cat6 or Cat6a, where to put the cabinet, and why first fix is the time to plan it.