Abstract: A staircase construction is disclosed in which a plurality of identical riser units are bolted together in series, each riser unit comprising a tread member in the form of a flat slab, and two bracket members each supporting a respective end of the tread member.Each bracket member is formed from metal strip bent to shape in one plane and welded as and where appropriate and has a first horizontal planar part supporting the respective tread member and a second horizontal planar part spaced above the first part by the unit riser height and supporting a rear part of the first horizontal planar part of the next higher bracket member on the same side of the staircase, the last mentioned bracket member being set forward with respect to the bracket member being set forward with respect to the bracket member which supports it.