The short answer
- A double vanity needs at least 60 inches of width to function, with 72 inches as the comfortable standard and 84 inches or more for spa-level separation.
- Sink centerlines should sit a minimum of 30 inches apart, 36 inches is comfortable, and 42 to 48 inches reads as spa-level spacing.
- Each person needs at least 12 to 15 inches of counter on the outside edge of their sink, with more room at the 72-inch and 84-inch widths.
- Counter height commonly runs 36 inches on a double vanity, matching kitchen counter height, versus the traditional 32 inches, chosen by household preference.
The numbers.
Minimum useful width: 60 inches. Below this, the sinks are too close together and the storage between them disappears. 60 inches gives 30 inches between sink centerlines plus 15 inches of counter on each outside.
Comfortable standard: 72 inches. Sinks 36 inches center-to-center, 18 inches counter on each outside. Generous storage between, comfortable elbow room.
Spa-level: 84 inches plus. Sinks 42 to 48 inches apart, 18 to 21 inches counter on each outside, room for a large storage unit between sinks (or two storage units flanking).
Height: 36 inches counter height is the modern standard for double vanity (kitchen counter height, easier on the back). 32 inches traditional. Pick by household preference.
Common questions.
- What is the minimum width for a double vanity?
- 60 inches. Below this, the sinks are too close together and the layout does not work. 72 inches is the recommended comfortable standard.
- How far apart should sinks be on a double vanity?
- 30 inches between sink centerlines is the minimum; 36 inches is comfortable; 42 to 48 inches reads as spa-level separation. Less than 30 inches and the sinks crowd each other.
- Is a double vanity worth the bathroom space?
- Yes in primary baths where two people get ready simultaneously. The functional improvement (no one waiting for the sink) is real. Skip it in secondary baths or homes where simultaneous use does not happen.
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