For any work in your home we would always advise to contact a registered electrician
Answered by Dave, Electrical Safety Expert
For any work in your home we would always advise to contact a registered electrician. This gives you the peace of mind that if something does go wrong, the work is insured and their scheme operator can help you if you are not satisfied.
Generally, the depth is 0.5m deep and the route should be marked on a drawing, attached to the Electrical Installation Certificate.
You can find an electrician local to you here.