Anywhere between $600 and $8500. Your question sounds like “I want to buy a car on 4 wheels - how much would that be?” Please provide more detailed explanation - precast base or custom, installed on concrete or accessible from underneath, etc, etc.
A custom mud shower pan should cost between $30-$40 a square foot if the installer is decent and understands the liability and their worth. A prefab install can range from $150-$600. Demolition will be extra, any drain work will be extra, and structural bracing for a mudpan and tiled shower will be extra as well. Hope this helps!
That really depends on what you are looking to have done as a complete project. There are different things involved in replacing the shower base such as framing, hot mopping, tiling, and plumbing.
Thanks
Here in California, the cost for a full remodel bathroom can range from $10,000 to $20,000, labor only for standard (8x5) bath room.
You can always get it cheaper using fiberglass materials.