The 30% rule is a planning guideline that says a major renovation should usually stay under about 30% of the home's value unless the work solves a long-term need, repairs a serious issue, or supports a larger investment plan.
For bathroom remodeling, the rule is less about hitting an exact percentage and more about keeping the project proportional to the home, neighborhood, and bathroom type.
How It Applies To Bathrooms
A luxury primary bathroom in a Bellevue home can justify custom tile, heated floors, frameless glass, premium fixtures, and better storage. A small hall bath or powder room usually should not carry the same finish budget unless the rest of the home is equally upgraded.
When It Makes Sense To Spend More
Spending more can be reasonable when the existing bathroom has water damage, a poor layout, failing ventilation, aging plumbing, or finishes that are far below the value of the home.
A Smarter Rule
Invest first in waterproofing, layout, ventilation, lighting, and quality labor. Then use the remaining budget for visible luxury finishes that improve daily use and resale confidence.