Is $12,100 to renovate a shower tub combo a fair price?

This quote is for the renovation of a shower tub combo, including new tile, a new bathtub, new fixture hardware, and waterproofing under the tile. The scope of work includes: - Demolition: Existing 60"x 30" tub and cultured marble surround removed down to studs, leaving drywall in the tub area approximately 1' from the ceiling. - Bathtub Replacement: New Kohler acrylic tub installed (with an $800 allowance). - Fixtures: Delta series 17 shower valve and trim installed (with a $350 allowance). - Waterproofing: New Dens shield ½" drywall or cement board installed, caulked, and waterproofed with Blue Guard sealer. - Tiling: Approximately 85 sq ft of tile installed from the top of the tub to ceiling height (approx. 8') in the tub area only. - Finishing: Any necessary drywall repairs made, and paint matched as close as possible (note: paint matches are not always 100%).