What Size No-Plumbing Vanity Unit Should I Choose? 400mm–600mm Guide
Choosing the right no-plumbing vanity unit is mainly about available width, how much working space you want around the basin, and the style of unit that suits the room. Custom Basins offers compact options from 400mm through to 600mm, all designed for spaces where a conventional mains water connection is not practical.
If you are new to self-contained sinks, start with our guide to sinks without a mains water supply. If you already know you need a complete unit, you can also browse all portable no-plumbing sinks.
Which vanity-unit size should I choose?
As a rule, choose the smallest unit that gives you enough basin and surface space without making the room feel cramped. Measure the available wall width, allow clearance for doors and drawers, and check the individual product page for the current basin, tap, finish and system options before ordering.
400mm vanity units: best when space is tight
The 400mm Vanity Unit & Basin is the most compact choice in the core size range and is a strong option for smaller treatment rooms, salons, clinics, studios and other spaces where every centimetre matters. There is also a 400mm Square Vanity Unit & Basin if you prefer a different shape and look.
450mm vanity units: compact with a little more room
The Basics 450mm Vanity Unit gives you a modest step up in width while keeping a compact footprint. If you want the same 450mm size class with more tap and system flexibility, compare the Basics Plus 450mm Vanity Unit, which offers an optional upgraded system and compatible mixer-tap choices.
500mm vanity units: a balanced mid-size option
The 500mm Vanity Unit & Basin is a useful middle ground when you have more room than a compact 400–450mm space but still want a relatively small self-contained unit. If you like a more textured cabinet style, compare the Ridged 500mm Vanity Unit & Basin as well.
550mm vanity units: between compact and full-width
The Basics 550mm Vanity Unit sits neatly between the 500mm and 600mm options. It is worth considering when the room allows a little more width but you do not need to move all the way up to the largest compact-format unit.
600mm vanity units: more width where space allows
The 600mm Vanity Unit & Basin is the widest option in this core 400–600mm comparison. It suits rooms where you can dedicate more wall space to the wash area and want a more substantial vanity presence while retaining a self-contained no-plumbing setup.
What about ridged and coloured vanity units?
Size is only one part of the decision. The Ridged 400mm Vanity Unit & Basin and Ridged 500mm Vanity Unit & Basin provide an alternative cabinet style, while the Matte Colours Vanity Unit & Basin is worth exploring if colour and finish are a priority.
How to measure before ordering
Measure the clear wall width rather than the total room width. Then allow for nearby doors, treatment couches, chairs and storage. Check access through doorways and corridors as well as the final installation position. Product specifications can change as ranges evolve, so use the dimensions and option details on the individual product page as the final reference.
Quick size summary
Choose 400mm when space is at a premium; 450mm for a compact setup with slightly more room; 500mm for a balanced mid-size choice; 550mm when you want a step between 500mm and 600mm; and 600mm when the room comfortably allows the widest option in this compact range.
Still deciding? Compare the full no-plumbing sink range or contact Custom Basins if you need help matching a unit to your room and intended use.