Deck components comprising a post sleeve and flanges extending away from side walls of the post sleeve are described. The post sleeve includes a rectangular cross section. Interior flanges can comprise attachment holes for affixing the interior flanges to box-frame-segments having square-cut edges. Box-frame-segments and box-frame-segment attachments with square-cut edges can abut the exterior surface of a post sleeve side wall. Use of the post sleeve can reduce or eliminate the need to produce beveled joints box-frame-segments and box-frame-segment attachments. Post sleeves can comprise a post sleeve extension extending above box-frame-segments that attach to the flanges of the post sleeve. The post sleeve and post sleeve extension can comprise a single metal extrusion. Alternatively, the post sleeve extension can be attached to the post sleeve. In one example, a post sleeve extender is placed into a post sleeve and the post sleeve extension is placed onto the post sleeve extender.