Abstract: A manufacturing system provides for building staircase assemblies of different design criteria and different building codes. The assemblies are manufactured in an assembly-line manner from one or more centralized manufacturing facilities. Individual projects are shipped to different job sites. The assembly is formed in an off-site, manufacturing facility. The completed assembly obtains a certification to indicate successful building code compliance for the final jurisdiction. The completed stair assembly is disassembled, packaged and shipped to the final building construction site where the assembly can be reassembled and installed. Final installation adjustments, as needed, can accommodate height, width or length adjustments needed to overcome manufacturing tolerances between the assembly and its stairwell. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: A stairway assembly having an external step portion, an internal step portion slidably engaged with the external step portion; a first stringer secured to the external step portion to support the external step portion; and a second stringer secured to the internal step portion to support the internal step portion.