The reasons for my desire to do this are twofold. Firstly, it saves money and time, as you only have to hire one location or build one set and you reduce the number of necessary company moves (transporting all cast & crew).
Secondly, I love those kind of movies. In everything from 12 Angry Men and Rope to Moon and Buried (which is arguably the uttermost example) there is a palpable sense of drama in every scene driven by an uneasy feeling of something close to claustrophobia, because the outside world remains just that, on the outside, unexplored and therefore unknown.
For this reason, single-locations are a device used to a great extent in the horror genre. Sam Raimi even put the audience in the shoes of that oppressive "outside world" in The Evil Dead with his famous "Shaky Cam". However, I knew horror was not the genre I wanted to tackle, not because I have any less respect for it than other genres but simply because single locations are such a tried and mastered technique in horror I felt there were greener pastures elsewhere.
Initially I wrote a gangster short which never really took off. I also wrote something of a heist scene, but it felt exactly that, a scene from a feature film rather than something that deserved to be a short in its own right. The same was true of the next short I wrote which had a science-fiction twist to it; it became much too big for its own boots and has since become a feature length screenplay.
And in a single location movie, even a short that lasts no longer than fifteen minutes, you do get to linger there. Every corner of the set will be visible at one point or another, the audience can get to know the main character's apartment just as well as he does. Meanwhile, the lashing rain enforces the oppressive nature of the unseen world outside which renders it as unfamiliar to us as it is to a hermit obsessive computer programmer like Guy.
Noir jumped out as the perfect platform for the single location short. Onto writing it...