For the entire first season, the hinges on the front door are on the right and the stairs have a corner at the bottom. However in all seasons after this, the hinges on the front door are on the left and the stairs go straight down to the floor, no corner. (Some sets do sometimes change between the pilot episode and episode 2, but I have never seen something change after a whole season.) See more...
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The Unkindest Cut (series 2)
Nick: How do you expect me to make 5 star food with 4 star fungi?
Susan: I have decided to put an end to this madness that is ruining all our lives.
Michael: You're going to kill dad?
Michael: The fact is, now that Mum's "hands-off", it's like there's two Bens, and one of you has to go.
Michael: You're expendable.
Ben: Erm, I'm what... expendable?
Michael: You see? That's another thing. You're very slow on the uptake.
Ben: Michael, are you firing me?
Michael: Very, very slow.
Ben: I don't believe this. You can't fire me. I quit years ago.