The standard depth of a bathroom vanity it’s a range between 20-23 inches, on the other hand you can expansion floor space in a minor bathroom by trimming at least part of the vanity to 21, 18, or even 16 inches deep. This dimension is taken from the front of the bathroom cabinet to the rear of the cabinet and does not include any extension of the top. This discourses the question concerning regular depth of a bathroom vanity minus the top.
Standard dimension does not include the top so there is no need to deduct the counter top extension. Bathroom vanities standard depth is 21 inch with low complexity vanities also available for thin bathroom designs. In the region for example you have a bathroom vanity with 20 inch depth and a 21 inch top. Your depth would be 20 inch with a 1 inch extension. Installing a slight traditional or transitional bathroom vanity can rise open floor space and create minor bathrooms look superior. You can find small transitional bathroom vanities with depth scopes as low-slung as 8 inches.