We can create a custom niche on your bathtub or shower wall during your bathroom renovation. Most customers prefer to have a standard size niche with or without shelf. For having a standard size niche we always use Schluter premade niche. We do recommend to have 12" * 24" niche with a Schluter shelf in centre to maximize your space. We do our best to have the grout line on top and bottom of niche to create a best look for your shower wall.
Please see the attach picture from our previous bathroom remodeling.