Your shower door installation will vary depending on a number of factors. For an approximate cost, you'll want to factor in the shower door type, the size of the door itself, the material it's made of, and lastly, the complexity of the installation. Also, remember that any necessary plumbing or electrical work, the cost of permits, or any potential remodeling should be factored into the final cost. On average, a shower door installation may cost you between $300 and $800. However, this is just a general estimate as there are different types of doors and installations (please contact Valentine Plumbing for an estimate on your project cost.) More info here about installation cost.