Estimate bathroom renovation budget by scope and finish.
Bathroom additions return 50–70% of cost at resale. Mid-range full bathroom remodels return 60–70%. The highest ROI bathroom improvements are: re-caulking (near 100% ROI), new fixtures and hardware, and fresh tile grout cleaning or re-grouting.
Waterproofing is the most important step — water damage behind tile is the #1 cause of bathroom failure. Always use cement board (not regular drywall) in wet areas, and apply a waterproofing membrane in shower and tub surrounds.