This estimate for a 2019 Typical Bathroom Remodel is derived from the unit cost method summarized in the American Institute of Architects Detailed Cost Estimating - Best Practices. This approach is used by professional designers, contractors, engineers and estimators and uses current wages, material costs, worker productivity benchmarks, supervisory overhead and markup rates.
Between the two options, pick up one tile design that suits your necessity and budget. Remember to put forward safety for your children in this point. In case your budget is limited, you can partially change the tile. Determine which part of the bathroom that needs new, safer tiles. This will definitely save more money compared to overall tile changing.