The first step in designing a bathroom is to make sure you have enough space. Not every bathroom can accommodate a separate bathtub and shower or a double vanity, but you will be surprised what can be done with even a modestly-sized bathroom. Standard bathtubs are usually 60” x 30” but the newer tubs that offer more comfort are usually 72” long. Like we mentioned earlier, showers come in a variety of sizes, but the most common ones are 36” x 36”, 36” x 42” and 36”x 48”. Some other dimensions to keep in mind are a 30” clearance for a standard swinging shower door and at least 15” of clearance from the centerline of the toilet to any adjacent wall or cabinet. There should be a 30” clearance between all major fixtures, such as the front edge of a vanity and the shower. There is no requirement for the distance between double sinks, but a good rule of thumb is 30” to 36” apart, measured from center to center.