Bathrooms are often trickier than homeowners realize. Even small bathrooms require precise attention to detail in order to ensure that all the materials and transitions from one area to the next are properly addressed. Proper water-proofing adds another layer to these projects. Of course the size and scope of the project also affects pricing. You should expect to spend approximately $30,000 on a simple bathroom remodel and over $50,000 for a larger or more complex project.