The bathroom is a hotspot when it comes to doing home renovations and remodels. And there are so many ways to level up your bath design, from heated floors to eye-catching tile, that it can be tough to decide on which ones to take on. Especially important to keep in mind? Whether your upgrade investments will stand the test of time. To help you make that call, top interior designers across the country share their tips on the wisest ways to invest when it comes to renovating your bathroom.