Hi all,
I'm new to this forum, so hello and many thanks to the developers for making this (apparently) great software.
I'm in the process of having a house built, and plan to use Sweet Home 3D to figure out different room layouts.
I have first drawn the outside walls of my house: OK.
Then I tried creating a room using the dedicated tool, but the result's walls have no thickness, and adding a door does not automatically "open" the wall on which I place it.
So it looks like I did not do it properly, maybe I should have created walls for my room instead?

What is the correct process:
A. create the dividing walls ("Partition" in English, correct?) only, after defining a different thickness from that of the main "outside" walls?
B. create the walls first, then add a room within these walls?
C. create a room first, then add its walls?

Thanks in advance for your support.