What are the costs of remodeling a bathroom?

A house we're looking to buy has an unfinished master bath. All that is there is the framing, the insulation, and the plumbing to install a toilet and either a large shower or a small soaking tub. Ceiling, drywall, paint, mirrors, light fixtures, flooring, toilet, tub, fixtures, all are needed. Any ideas on cost would be appreciated. Thanks!