Why add a few feet of extra space, or a tiny porch to provide somewhere to hang coats - when doing so would be SO easy - if it will eat into your massive profits?
Everything is such a race to the bottom in this country.
That house wasn’t built like that. A previous owner has ripped out the ground floor walls to conform with current fad for open plan. I’m surprised they didn’t paint the outside grey while they were at it.
They are probably moving because it’s too drafty, noisy and the pong from the loo pervades the whole living space.