A walk-in shower conversion in an existing bathtub footprint, with tile, drain modification, and frameless glass, typically runs $8,000–$18,000 depending on tile selection and glass configuration. A fully custom shower built in a primary ensuite with premium large-format tile, custom niches, a linear drain, and a frameless glass enclosure can run $15,000–$30,000 or more as part of a comprehensive ensuite renovation.