Once you locate a wall then find out the actual position of the door.
Putting a door in a concrete wall.
The cost to dig a full basement verse a crawl space was minimal as was the cost of the additional concrete to pour the walls.
Mark the opening size for the door on both sides of the wall.
I forget now but maybe it was 800 more to dig and pour a full basement and it cost 450 for cutting a door in a concrete foundation.
The best place to install a door into a masonry brick wall is in a non load bearing wall.
Score the lines for your opening with a circular saw.
You ll need a masonry saw blade to make these.