A shower niche looks simple after tile is installed, but it is one of the details that benefits most from planning before the walls are closed. Its location affects framing, waterproofing, tile cuts, plumbing and how convenient the shower feels every day.
Quick answer: plan the niche before rough plumbing and tile layout are finalized, keep it clear of pipes and valves, support it with proper framing, integrate it into the shower’s waterproofing system and slope the finished shelf so water cannot pool at the back.
Choose the Location Before Tile
Check stud locations, valves, pipes and the planned tile layout. Moving a niche a few inches can sometimes avoid awkward cuts or conflicts inside the wall.
How Big Should a Niche Be?
There is no universal size. Think about the bottles and products that actually need to fit. A taller niche with a shelf can separate smaller items from large bottles; a wide horizontal niche creates a strong design feature but may require more framing coordination.
As one prefabricated example, Schluter currently offers KERDI-BOARD-SN niches in 12 × 6, 12 × 12, 12 × 20 and 12 × 28-inch sizes. Those are product options, not universal “correct” niche dimensions. A custom niche can be larger or differently proportioned when the framing and waterproofing system allow it.
Tile Layout Matters
Whenever possible, coordinate the niche edges with grout lines or the overall wall layout. Tiny slivers of tile around the niche can make an otherwise expensive shower look poorly planned.
Waterproofing Is the Critical Detail
Every inside corner, outside transition and penetration needs to be integrated into the shower waterproofing system. The bottom surface should drain toward the shower rather than holding water.
Prefabricated vs. Custom-Built Niches
Prefabricated waterproof niches can simplify installation and reduce the number of field-built waterproofing details. Custom niches provide more freedom in size and location but demand careful execution.
Bottom Line
Plan the niche at the framing stage, coordinate it with the tile, make it large enough for real products and treat waterproofing as more important than the decorative trim.
See our Best Shower Waterproofing Systems 2026 and Kerdi vs cement board.
