An adaptable toilet plumbing riser shroud provides for fast and simple field installation of toilet plumbing riser shrouds without requiring custom prefabrication of shrouds or constraining the plumbing design to a predetermined shape. Two cover portions, one of which is slidably inserted inside the other are secured together. The cover portions are also secured to a wall behind a toilet plumbing riser using brackets. A bottom cover may be provided and cut to permit the riser to pass therethrough. The bottom cover may also be formed from two portions one slidably inserted in the other and then glued together after cutting with plastic cement. The bottom is then attached to the bottom of the shroud using screws. The cover portions may be molded as a single piece and then singulated, and the bottom cover portions may also be formed as a single piece prior to singulation, as well.