Hi oriOn,
Your question is kind of vague. But generally, you will need a wide angle lens; if the space is really constrained, you may need an ultra-wide angle lens instead.
Wide angle will be about 24mm (35mm equivalent), so unless you are using a full-frame camera, you will need a lens about 17 or 18mm on the wide side (translates to about 26 to 27mm at 35mm equivalent).
A few examples of such lenses include the Canon 17-55mm, Tamron 17-50mm and Sigma and Nikon should have similar lenses too.