paving or patio door first

kabdxb

We are planning on getting our existing patio relayed with the addition of a built up step that will run the full length of a new sliding patio door.

The aim is to have a step on the outside, approx 900mm that will be the same height as the door frame threshold, or as close to as possible, down onto the patio. There is an existing window and french door set up and i know that there will be internal work required around the frame and the flooring inside.

We have a paving company who have priced for the step and doing the paving. The window company have given us a separate cost for the remedial work which includes all the internal fixing and the threshold work.

There is an existing sill that needs to be removed and a new threshold built up. I have no idea which should be done first and obviously don't want to be paying to have something done twice.

thanks

BryanF

Door should be installed first
Weathering Dpc detail and thermal considerations will be important at the threshold.