The house in this poster isn't in the film. It's been
added because no-one is able to cope with the
concept of a Vincent Price film that isn't gothic.
(It does turn up in almost every Tim Burton film,
though)The Last Man on Earth
(feature film, 1964)
Directed by Ubaldo Ragona & Sidney Salkow
Written by William F Leicester and Richard Matheson
Based on the novel I Am Legend by Richard Matheson

Amazon US DVD
Some notes on buying: you should really get a version that's original B&W,...