What's the standard size of a walk in shower?
Keeping this in consideration, what is the best size for a shower?
Lengths will vary. While you can see standard shower sizes as small as 32″ x 32″, most people would feel comfortable in a 48″ x 36″ size shower. If your home has a little more space available, a very common recommendation is to have a shower with minimum dimensions of 60'' x 36''.
Regarding this, how big does a walk in shower need to be to not have a door?
If you plan to apply some of the principles of “universal design” in your shower project, the stall should be at least 36-by-36 inches, or optimally a minimum of 42-by-60 inches. This no-threshold walk-in shower was designed for an individual with compromised mobility. Universal design principles were applied.
In general, removing a tub and installing a well-appointed walk-in shower also increases the value of a home. That being said, if you have to choose between a bathtub and a walk-in shower, and most of us do, it's important to consider if you have another tub.