The height of your tub will be important for a number of reasons. You’ll need to know how high it will be so that you can plan tap placement, drainage, tiling and to see if you will need to sink the tub into the floor a little to be able to get in and out of it. High tub walls may be particularly problematic for the elderly or disabled too – in which case a walk-in tub or a step may help. If your tub is sitting unusually high, you may need to obtain or install a step to allow safe access for bathing even if you’re completely able-bodied. Ensure that the step has non-slip surfacing to prevent injuries.
A lower tub will make a smaller bathroom look bigger. If you have plenty of room to spare, some baths are better suited to being surrounded by a platform to artificially alter the height, and this can create a beautiful effect if planned properly.