When to Use 22” and 22 1/2” Deep Lavatories

22" deep lavatories work best with traditional style vanity cabinets.
The traditional overlay style vanity cabinet has a visible face-frame. A 22" deep lavatory has the appropriate overhang for this style of cabinet. (Please see diagram)

22 1/2" deep lavatories work best with modern or full-overlay vanity cabinets.
The modern or full-overlay cabinets have no visible face-frame and therefore appear deeper. The extra 1/2" is needed in order to maintain the appropriate overhang appearance. (Please see diagram)
Other installations which may also benefit by using the 22 1/2" deep lavatories are:
When the framing wall leans back and away from the cabinet, the lavatory will sit farther back on the cabinet and the additional depth is needed to maintain proper overhang. When using a 1” or 1 1/2” thick lavatory, the extra overhang often looks more appropriate. When more overhang is desired.