Id thought by now that an experienced poster would have known that already, but you are welcome to be self taught on this particular issue. The facts are discoverable here through various means..Im at work and cant guide you at this moment.
This thread should bury the one I'm about to post but I wanted to comment on your post. I agree.
I'd have to research it further but... I tend to think that the house, at one point, was a single family dwelling [many, many years prior]. I'd guess that as the dynamic of the East End changed with the wave of immigration over the years, the single dwelling house was partitioned off to serve as a multi-family rental dwelling. My suspicion is that, at one point, there was a large open area when you entered the house off of Dorsett St. In the front was a "living room" and towards the back was the "salon". I think this is supported by the comfort of a fireplace and two large windows that overlook the garden or courtyard. I believe the rooms were 'separated' by a staircase. My only deviation from the story is [I'm assuming here] that there were two walls added later on. The first wall... we know about. I think it extended off of the staircase and created the inner wall of No.13 [Mary Jane's room]. But I think there was a second wall added off the other side of the staircase, which converted "the living room" into its own separate space. This room would become the McCarthy's storage room. The two walls created a hallway leading to the stairs off the passageway. In order to accommodate for this hallway, another door was added... in addition to the one created for No. 13.
Best of luck if you continue with Casebook, Darkwood.
Of the few sketches of Mary Kelly's room that appeared in the newspapers at the time, they all vary widely in their dimensions and room furnishings. Is there any consensus on which sketch, if any, is the most accurate? Or, has anyone seen a modern sketch or rendering of the room that is based on the known facts? I'm looking for the best source to visually recreate the room as closely as possible.
It occurs to me you might also find some good images in the graphic novel From Hell by Alan Moore and illustrated by Eddie Campbell. Eddie did do some research and has the room and its furnishings fairly close to the descriptions we have of the place.
When scaling Kelly's room using the Goads map scale, the back room seems to be approx. 15ft x 10ft.
It was reported in the press to be either 12 x 12, or 15 x 12, but 12 ft is far too narrow to be the width of a house. Even 15ft is small but more likely than 12 ft.
But, as I say using Goads the room seems to be about 15ft wide x 10ft deep.
I've been requesting a larger room for nearly 4 years so that I can get a companion animal and a bookcase. As it is, I have NO extra space for ANYTHING. I have to put the books that I'm using in stacks on the floor, so I'm called a "hoarder", and as soon as they see that word all of the bureaucrats think I'm living in piles of garbage.