Is there any legislation regarding working in an office that has no windows or natural light?

Myself and at least one other person are being asked to move into a small office that has no natural light. It is in the centre of a building opening on to a corridor. Also in the office there is a sink amd a door into a staff toilet, that also has no outside light. Therefore we will be working within hearing distance of someone using the toilet. Is there any legislation that regulates this type of thing?