Bathroom Cabinet 20 cm Deep — Which Alcove and What Fits Inside?

A bathroom cabinet with a depth of 20 cm is a slender problem-solver for narrow alcoves, perfectly proportioned for standard cosmetic bottles, toilet paper rolls, and small guest towels.

Planning a compact bathroom often resembles a game of Tetris – every square centimetre of floor space must be used accurately without restricting movement. When space between the washbasin and the wall, next to the shower, or behind the door is extremely limited, standard furniture quickly reaches its limits. This is where a bathroom cabinet depth 20 cm comes into play. This guide explains how to calculate the available space, what fits into this specific depth, and what you need to consider during DIY assembly and fitting selection.

Which Alcove Suits a 20 cm Deep Cabinet?

The decisive advantage of a shallow depth is the ability to turn unused, dead space into functional storage. Before deciding on a unit, measure your planned alcove precisely. Pay attention to skirting boards, protruding tile edges, or exposed pipework that could reduce the actual usable footprint.

Typical installation locations for bathroom cabinets narrow include:

• Next to the washbasin: Narrow gaps of 25 cm to 30 cm width often remain here. A 20 cm deep cabinet will not protrude into the walkway and aligns neatly with shallow basin vanity units.
• Behind the bathroom door: The door swing limits furniture depth. A depth of 20 cm is usually sufficient to allow the door to open fully without striking the carcase.
• Above the toilet: Mounted as a wall-hung unit, this depth provides adequate headroom when standing up.
• In wall alcoves: Older properties often feature chimney breasts or unused recesses where shallow cabinets fit perfectly.

Space Check: What Fits into a 20 cm Depth?

A common concern when assembling slim furniture is internal usability. With an external depth of 20 cm, a typical HDF back panel, and a standard front thickness (usually 16 mm or 18 mm), the usable internal depth is roughly 16 cm to 17 cm.

The following everyday items can be stored without issue:

• Cosmetics and toiletries: Shampoo bottles, shower gel, and hairspray generally have a diameter of 5 cm to 8 cm. They can comfortably be arranged in two rows.
• Toilet paper: A standard roll has a diameter of around 11 cm to 12 cm, fitting easily onto the shelves.
• Medicines and small items: Cream jars, toothpaste tubes, and shaving kits find ample space.
• Guest towels: Small hand towels (30 x 50 cm) can be neatly stacked or rolled.

However, this depth is unsuitable for large bath sheets or shower towels (70 x 140 cm), which require deeper storage. In such cases, a chest of drawers depth 30 cm or a roomier storage unit is a better choice for a hallway or bedroom.

Materials and Construction for High-Moisture Rooms

Bathroom furniture is constantly exposed to humidity and temperature fluctuations. When assembling or building units, you should pay close attention to suitable materials. The carcase is usually made of melamine-faced chipboard, with edges ideally sealed using protective ABS edging tape. For fronts, MDF (medium-density fibreboard) is widely used, as it can be routed, painted, or foil-wrapped effectively.

Fittings and Internal Hardware

Doors on narrow units are traditionally mounted using a concealed cup hinge. Full overlay applications use a standard overlay hinge, whereas inset fronts require an inset hinge. An opening angle of 95° or 110° is perfectly adequate for bathroom spaces.

Shelves sit on metal or plastic shelf supports inserted into holes with a diameter of 3 mm or 5 mm. Thanks to the standardised System 32 (32 mm hole spacing), you can flexibly adjust shelf heights to accommodate your toiletries. A bathroom cabinet with drawers typically uses a ball-bearing runner or roller runner for drawer slides, though the usable extension stroke is naturally short with a 20 cm overall depth.

Assembly and Wall Anchoring Notes

Assembling a shallow cabinet requires basic tools: a cordless screwdriver, Pozidriv bits (PZ2 for most wood screws), a rubber mallet, and a spirit level. The carcase is typically assembled using wooden dowels and a cam and pin connector (Minifix system).

Important installation note: A cabinet that is 20 cm deep but, for example, 180 cm high has an unfavourable centre of gravity. Once the door is opened, there is a significant tipping risk. Every tall, shallow unit must be securely anchored to the wall. Use suitable wall brackets and select wall plugs and screws designed for your specific substrate (masonry, concrete, or plasterboard).

Visual Integration into the Bathroom

The colour of the cabinet significantly influences the perception of space in compact bathrooms. Light shades reflect illumination and make the room appear more open. Bathroom cabinets white are a classic choice, blending seamlessly into almost any tile scheme.

If you prefer a contemporary contrast, darker finishes work well. A bathroom cabinet black complements industrial-style taps and fittings, while a bathroom cabinet grey offers a softer, Scandinavian-inspired alternative to solid black.

Alternatives: When 20 cm Is Not the Right Size

If your alcove is even narrower, a bathroom cabinet depth 15 cm may be the only option, serving primarily as a medicine or pure cosmetics cabinet.

If you have slightly more room and wish to store hair dryers or larger towels, consider stepping up in depth. A bathroom cabinet depth 25 cm offers noticeably more internal volume without appearing bulky.

Frequently Asked Questions (FAQ)

Do I need to fix a 20 cm deep bathroom cabinet to the wall? Yes. Due to the shallow depth relative to the unit height, these cabinets tip easily, especially when the door is opened or weight is placed on the front edge of the shelves. Wall fixing brackets are essential for safety.

Do regular towels fit in a 20 cm deep cabinet? Standard bath towels (50 x 100 cm) or large shower towels will not fit easily unless rolled extremely tightly or folded multiple times, which is impractical. Furniture with a depth of 30 cm or more is recommended for large textiles.

What tools are needed for assembly? For assembling the carcase, a cross-head screwdriver (or cordless drill) and a rubber mallet for wooden dowels are usually sufficient. For wall mounting, you will also need a drill, suitable masonry or tile drill bits, wall plugs, and a spirit level.

Can drawers be used effectively at a 20 cm depth? Yes, although internal volume is limited. Accounting for the drawer back and front, the internal drawer depth is usually around 14 cm to 15 cm. They are ideal for shallow items such as make-up, hair ties, combs, or razors that might otherwise look untidy on open shelves.