Direct answer: Choose vanity size by usable wall width, number of users, basin type, storage, plumbing and circulation. Dimensions used during planning are references only; final production should follow an accurate site measurement.

Start with the use scenario

ScenarioPriorityDirectionSmall bathroomClear circulationUse a compact single basin, wall-mounted cabinet and efficient mirror storageMain bathroomCounter and storage balanceCoordinate basin, drawers and available wall widthTwo simultaneous usersBasin spacingVerify standing positions and drawer clearanceVilla or large suiteOverall proportionDesign vanity, counter, mirror and lighting as one system

How should vanity width be selected?

Measure the clear wall and subtract door trims, shower screens, toilets, service access and finishing tolerances. A single basin is efficient for compact rooms. A double basin works best when two people regularly use the room at the same time and there is enough circulation space.

Depth and installation height matter

An overly deep cabinet narrows the aisle, while an overly shallow unit can restrict basin and storage choices. Installation height depends on user height, basin type, faucet and mirror position. Confirm these elements together rather than treating the cabinet as an isolated product.

Coordinate the mirror cabinet

The mirror does not always need to match the vanity width, but its visual centre should relate clearly to the basin or cabinet composition. Check door swing, nearby lighting, outlets, anti-fog power and side-wall clearance.

Checklist before final measurement

  • Finished wall width, floor level and wall alignment;
  • Water supply, drainage and wall or floor outlet;
  • Outlets, mirror lighting and smart mirror requirements;
  • Door, drawer and adjacent fixture clearance;
  • Basin, faucet, backsplash and maintenance access.

Frequently asked questions

Can I order from a standard size?

Use standard sizes for comparison, but verify the site before production.

Is a double basin always better?

No. It adds value mainly when two people use the bathroom together and the room can support it.

How can a small bathroom gain storage?

Use mirror cabinets, divided drawers and vertical storage without making the base cabinet too deep.

When is customization useful?

Customization is valuable for non-standard walls, complex plumbing, specific storage or a coordinated interior finish.

Share your plan, site photos and user needs with QFJJ for an initial vanity layout discussion.