This piece of wood under the threshold of the back door is rotting. How do I replace. Do I need to take the whole door out? Can it be replaced with Stone / concrete. I won't be doing it myself but have no idea where to start looking at costs and don't want to get taken for a ride as money is tight.
Bad photo but you can just see the rotting wood under the door
This piece of wood under the threshold of the back door is rotting. How do I replace. Do I need to take the whole door out? Can it be replaced with Stone / concrete. I won't be doing it myself but have no idea where to start looking at costs and don't want to get taken for a ride as money is tight.

Bad photo but you can just see the rotting wood under the door