Bathroom design and plumbing are undoubtedly the most important factors that play into the cost. Moving plumbing is quite costly, so keeping the same blueprint floor plan would help alleviate some strain on your budget. Custom tile showers and bathroom flooring are also two factors that contribute to high bathroom remodeling costs. New bathtubs and showers can cost as little as $500, new toilets for between $300 and $500, and a sink replacement can be done for $500 to $1,000. A complete bathroom remodel can cost as little as $2,500 and as much as $45,000 depending on the materials used and the degree of work required.