Buying Bathroom Vanity Units from China Without Getting a Kitchen Cabinet in a Wet Room

The first container of vanity units a Dutch importer bought from Foshan looked superb. Grey oak laminate, matte black handles, soft-close doors, and a price that undercut his previous Polish supplier by enough to double his margin. Nine months later he was shipping replacement doors, because the bottom edge of every single door had swollen where it met the wet floor.

The units were not defective. They were made to the specification he gave, which said "18 mm MDF, melamine finish, soft close". That specification describes a bedroom wardrobe. A bathroom vanity lives in a room that reaches 90 percent relative humidity twice a day.

Start with the board, not the colour

Three board families show up in Chinese vanity production, and the price gap between them is real.

• Standard MDF or particleboard. Cheap, machines beautifully, and absorbs water at any unsealed edge like a sponge. Fine for carcases that never touch water — which in a bathroom is nowhere.
• Moisture-resistant (MR) board, usually green-core. The resin system resists water uptake, and it costs maybe 10 to 20 percent more than standard board. This is the realistic baseline for an export vanity, and it should be stated on the drawing, not assumed.
• Plywood or blockboard with exterior-grade glue. Better wet performance and better screw-holding than MDF, heavier, and increasingly common at the mid and upper end. Plywood carcases are what I would specify for a shower-adjacent vanity.

If the project is a hotel or anything with a service life expectation beyond five years, there is also a solid polymer or aluminium carcass option. It costs more and it does not swell, ever. Some buyers use it for the carcase and keep MDF for the doors, which is a reasonable compromise.

Edge sealing is where the specification is won or lost

Every board edge in a vanity must be sealed. Factory edge-banding with PVC or ABS, glued with a hot-melt that actually bonds to the board, is the minimum. Two additional details separate good factories from cheap ones: whether the edge band is applied to the back and bottom of the door as well (it should be, on all four edges plus any drill-through), and whether the hinge and runner screw holes are sealed after drilling.

A drilled hole through a melamine face is an open door for moisture. Good factories either use a sealed dowel system or apply a sealant to exposed holes. Ask. Most buyers never do, and this is the difference between a door that survives three years and one that survives ten.

The bottom of the unit deserves special mention. A vanity standing on the floor in a wet room wicks water up from the base. Ask for a plinth that is either PVC, aluminium, or at minimum a sealed and banded board with a moisture barrier film. Some designs also offer a fully sealed base tray — worth it if the unit sits on tiled floors that get washed down.

Doors, gaps and the fit problem

Here is a number that surprises people: a container of 300 vanity units passes through hundreds of individual door-fitting operations, and the acceptable door gap in a factory that exports to Europe is usually 2 to 3 mm, consistent all round. On a sample, that is what you will see. On production, an overworked line can drift to 5 mm on one side and 1 mm on the other, and it is not a defect a customer accepts.

Put the gap tolerance in the specification and in the AQL. Also ask for a hinge that allows adjustment — three-way adjustable hinges let the installer or your quality team correct small drift, which is a practical way of absorbing factory variation. A non-adjustable hinge turns a 1 mm drift into a rejected unit.

Soft-close on doors is now standard, but the mechanism matters. Cheap soft-close dampers start squeaking and lose their cushioning after a few thousand cycles; a branded hinge with a documented cycle rating is a small line item on the cost sheet and a large one on the complaint log.

Drawers: the runner decides the product

A vanity with drawers is only as good as its runners. There is a clear hierarchy in what Chinese factories offer.

At the bottom, basic roller runners with a load rating around 20 to 25 kg. In the middle, ball-bearing slides, better but noisy and prone to grit. At the top, concealed under-mount runners with soft close and a stated load rating — brands like Blum, Hettich and DTC's higher lines show up on serious export units, and a documented 30 to 40 kg rating with a cycle count is what you should be asking for.

Under-mount runners also require accurate machining of the drawer box, which means a factory using them generally has better process control overall. It is a reasonable proxy for how the rest of the unit was made.

The classic failure in a bathroom, though, is not the runner — it is the drawer bottom. A thin 3 mm hardboard bottom in a humid room will sag or bow within a year if the drawer holds anything heavy. Ask for the bottom thickness and whether it sits in a groove or is stapled to the underside.

Worktops and basins, if they come as one unit

Many Chinese suppliers ship vanity plus integrated ceramic or sintered stone top. If the top is ceramic, check the glaze uniformity and the basin's underside — an unglazed or poorly glazed underside wicks water into the ceramic body. If it is a quartz or sintered surface, ask about the edge profile and whether the front edge is a full-thickness piece or a laminated strip, because a laminated edge can delaminate with thermal cycling from hot water.

Fit tolerances between the top and the carcass are another common complaint. A 2 mm overhang on one side and 6 mm on the other is fine in a brochure and obvious in a bathroom. Specify symmetry and check it on a production sample, not on a golden sample the factory keeps for buyers.

Packing, assembly and landed cost

Vanity units ship flat-packed or assembled. Flat-pack nearly always wins on container utilisation, and for a distributor who has an assembly partner it is the right call. Assembled units are ready to install but you pay for air in the box, sometimes 30 to 40 percent of the volume.

Weight and fragility both matter. Ceramic tops need individual foam and edge protection, and a heavy top in a carton with a light carcass creates a crush risk. Ask for the packing drawing and a drop test result, and get the gross weight per carton stated — freight forwarders and warehouse teams both need it, and it is a common cause of arguments at destination.

Finally, confirm spare parts policy before the first order. Vanities come back needing a door, a hinge, a runner or a handle, and a supplier who will ship a carton of spares inside the next container is worth far more than one who will not. Get that in writing while you have leverage, at the point of the first order.