Shower installation costs range from $800 for a basic prefab stall replacement to $8,000+ for a custom tile walk-in. The biggest cost variable is not the shower itself -- it is the labor for waterproofing, tile work, and plumbing modification. A $200 prefab shower insert costs $500-$800 to install. A $1,500 custom tile shower costs $3,000-$6,000 in labor. Here is what drives the cost at each level so you can budget accurately.