back door

Hi. I have a gap between my back PVC outer door and the brickwork. How am I best dealing with this? Please see the picture attached and thanks in advance for any help.

Hi All, Quick question please just want to make sure there isn't an issue with this or maybe there is a much simpler solution than putting a steel lintel under the current concrete lintel Garage conversation so removing the garage door and replacing with a back door and window. Currently above...