400mm Vanity Units

What size is a 400mm vanity unit?

A 400mm vanity unit measures 400mm wide and 200mm-300mm deep, making it one of the most compact bathroom storage solutions available. These slimline vanity units create a minimal footprint perfect for spaces where every centimetre counts. Heights vary depending on mounting style: wall-hung models are around 400mm-500mm, and floor-standing versions reach 800mm-900mm, including the basin.

Where do 400mm vanity units work best?

Our 400mm vanity units excel in confined bathroom spaces:

• Cloakroom Vanity Units: Perfect for downstairs toilets measuring just 1m-1.5m wide, where a 400mm footprint leaves adequate circulation space.

• Compact En-Suites: Ideal for narrow en-suite bathrooms where larger units would overwhelm the room proportions.

• Utility Bathrooms: Excellent for utility room washbasins or boot room facilities requiring basic handwashing stations.

• Corner Installations: Fits neatly into awkward corner spaces or alongside other bathroom fixtures without spatial compromise.

These compact units work particularly well in homes where guest facilities need to be functional without sacrificing valuable floor space.

Storage in a 400mm vanity unit

Despite their compact 400mm width, these small vanity units provide practical storage through single-door cabinet designs. Internal shelving allows you to organise essential cloakroom items, including hand soap, spare toilet rolls, cleaning supplies, and guest towels.

The 300mm depth provides sufficient storage volume for everyday essentials without protruding excessively into compact room layouts. Soft-close door mechanisms ensure quiet operation and extended hinge life, even in frequently used guest facilities.

For additional compact storage ideas, read our guide on tips for making small bathrooms look bigger.

400mm vanity unit mounting options

Choose between two practical installation styles to suit your bathroom layout:

400mm Wall Hung Vanity Unit: Wall mounted designs create a floating aesthetic that visually opens compact spaces. The suspended installation makes floor cleaning effortless whilst contributing to contemporary styling. Wall hung 400mm units require secure wall fixings into solid walls or reinforced studwork to support the unit's weight, plus the basin and water.

400mm Floor Standing Vanity Unit: Freestanding models offer a more grounded presence with simple installation that doesn't require wall mounting expertise. Floor standing 400mm sink units provide slightly more internal storage volume and work well in period properties where wall-mounting may be impractical.

For help on choosing the best one, explore our Vanity Unit Buying Guide.

400mm vanity unit styles and finishes

Our 400mm basin vanity units offer diverse finish options across the Turin and Como collections:

• Gloss White 400mm Unit: Bright, reflective surfaces that bounce light around compact cloakrooms, making small spaces feel more open.

• Indigo Grey Gloss 400mm Unit: Contemporary grey with a high-shine finish offering sophisticated depth whilst maintaining light-reflecting qualities.

• Hale Black 400mm Unit: Bold matte black creates striking contrast and modern drama, perfect for making design statements in small spaces.

• Grey Elm 400mm Unit: Natural wood-effect vanity unit that brings organic warmth and tactile interest to contemporary schemes.

Handle options include brushed brass, chrome, or matte black. You can also choose handleless designs with finger-pull mechanisms for ultra-smooth, minimalist fronts. 

For alternative finishes and styles, explore our complete collection of bathroom vanity units.

Basin options for 400mm vanity units

Our 400mm vanity unit with basin combinations feature compact ceramic basins specifically proportioned for slimline units. These integrated basins maximise usable bowl depth whilst maintaining the unit's minimal footprint, providing adequate handwashing capacity for cloakroom use.

The ceramic basin material offers durability and easy cleaning, with white gloss finishes that complement all cabinet colours. Waste kits are included with basin units, though tap selections are sold separately to match your preferred style and finish.

Installing your 400mm vanity unit

Installing a 400mm vanity unit requires careful planning to ensure level, secure mounting:

For Wall Hung Installation: Locate wall studs or use appropriate fixings for your wall type. Mark the mounting height, ensuring adequate clearance for plumbing connections. Secure the mounting bracket level before hanging the unit. Connect waste pipework before final positioning.

For Floor Standing Installation: Position the unit so waste connections are accessible. Check the unit sits level using a spirit level, adjusting feet if provided. Secure to the wall using the supplied fixings for stability. Connect the basin waste and seal the basin-to-worktop joint with silicone.

All units include detailed installation instructions and necessary fixings. For comprehensive guidance, consult our Vanity Unit Installation Guide.

400mm vanity unit delivery and customer support

We deliver 400mm vanity units throughout the UK with standard delivery in 2-3 working days. Express delivery offers next-day service when orders are placed before 2pm.

Our customer service team provides expert advice on product selection, measurements, and installation queries. Contact us today for assistance in choosing the perfect 400mm vanity unit for your space.