If you want to draw one room (and even more than a room) from their inner dimensions, view this video. Since it was published, you can even draw rooms with an irregular shape by triangulation.

Thank you. I will look into that.

Thanks for your very unhelpful answer. The feature requested by many users and according to the first answer "discussed since Sweet Home 3D exists" is OBVIOUSLY a feature that many users want. You can say that you personally do not have any use case for it but you cannot say that it is not useful ...

If you really want the first wall to start at 0,0 just move it after drawing: half of the thickness to the right, and half of the thickness down. That will position the top left corner at 0,0. From there you work from that first wall and probably not look at 0,0 again.
That's exactly what I did ...

Walls have a thickness so no matter how you look at it you will always have an offset. Start what part at 0.0? The outside top corner of the wall? The inside top corner? If you start a side of the wall at 0 then the other side has an offset as the wall thickness. So you always have two numbers. The ...

Thanks, function10.

I hope it will be implemented some time soon.
I do not see a big issue with implementing it since you could "simply" add an option to state where the wall should be placed:
centered, on the left or on the right edge. I don't see how this would make life harder for anyone if the ...

It would be handy if the items list in the lower left corner could include walls as well. Then you could quickly see if a wall was accidentally shorter than the opposite wall and you could adjust it there without having to click through the attributes of each wall.
For those who do not like this ...

In Germany, there is a rule that says that floor sizes depend on the room height, meaning
a room that is at least 2 meters high will be listed with its full actual size,
a room between 1 and 2 meters in height will only be listed with 50% of its actual size and
a room that is less than a meter ...

Hansmex said:
"Walls are drawn with their center line specified by their X,Y-coordinates.
The discussion about whether or not this is the best way to draw walls, is as old as SH3D. Seen the fact the nobody ever had a better solution, that is still the way walls are drawn today."

Is this still valid ...