Our work began with setting out the circular opening in the level 4 slab which we supported from below with new structural trimming steelwork before propping and cutting the new opening. We designed, fabricated and installed a helical steel staircase connecting the two floors. Formed from rolled steel plate, the balustrade was delivered in sections and welded together on site to produce a seamless tube with steps to the stair soffit. We provided a complete joinery finishes package, overseeing the design, coordination and installation timber treads and risers with matching timber to the soffit under the stair along with a continuous timber handrail to the balustrade. Also included in our package was a continuous wrap-around timber veneer spandrel panel to close the circular opening to the floor void above.