External door or floor first

[jamiegw]

We want to install a new external door, however the hallway floor is going to be raised around 5cm so it is level with the floors in the other rooms.
I am not sure what we should do first.

1. Install the new floor, resulting in the external door being unable to open. This may make installing a new door tricky.
2. Install the new door without knowing the exact height of the new floor. This may result in the height of the door being wrong.

 

[RandomGrinch]

One possibility...

Install the floor first, but leave a gap to the door to install a recessed Coir Mat - something like this (plenty of examples online)

and then install the new door at your leisure; building up the depth under the mat to the desired level.