How Deep Should a Bathroom Cabinet Be? (15 cm / 20 cm / 25 cm)

The ideal depth for a bathroom cabinet depends on the available space and the intended purpose; standard dimensions for slim bathrooms range between 15 cm and 25 cm.

In small bathrooms or compact cloakrooms, every centimetre counts. A cabinet that is too deep blocks walkways, clashes with doors, or visually shrinks the room. Conversely, a cabinet that is too shallow fails to provide the required storage for toiletries, towels, or cleaning supplies. Selecting the right cabinet depth requires precise planning of room geometry and a realistic assessment of storage requirements. This guide explains the differences between standard depths, provides guidance on material choice, and takes you step by step through professional wall mounting.

Types and Depths of Slim Bathroom Cabinets

The depth of a piece of furniture defines what items can fit inside. In the bathroom, three specific dimensions have become established, serving distinct storage concepts.

15 cm Depth: The Cosmetics and Medicine Cabinet

A bathroom cabinet with 15 cm depth is extremely shallow and sits close to the wall. This depth corresponds roughly to the diameter of a large tub of hand cream or a can of hairspray.

• Suitable for: Toothbrushes, shaving foam, deodorants, perfume bottles, medicines, and small cosmetic items.
• Advantage: A single row of items. Nothing gets lost in a second row; everything is immediately accessible. This dimension is often used for mirror cabinets directly above the washbasin, ensuring you do not bump your head against a carcase projecting too far into the room when brushing your teeth.

20 cm Depth: The All-Rounder for Alcoves

A bathroom cabinet with 20 cm depth provides noticeably more volume. Here, items can be arranged in rows, or larger bathroom essentials can be stored.

• Suitable for: Toilet rolls (standard diameter approx. 10 cm to 12 cm, fitting comfortably two rows deep), small guest towels (rolled), cleaning agents, hairdryer.
• Advantage: This depth is ideal for the space beside the toilet or as a shallow tall bathroom cabinet behind the bathroom door.

25 cm Depth: The Dimension for Linens

Anyone wanting to store towels in the bathroom should ideally choose a bathroom cabinet with 25 cm depth.

• Suitable for: Folded bath towels, large shampoo bottles in bulk packs, bathrobes, hairdryers with diffuser attachments.
• Advantage: Offers high capacity, but requires adequate clearance in the bathroom so doors can open without obstruction.

Buying Criteria: How to Choose the Right Depth and Specification

Before using the drill, room layout and material quality must be assessed.

Room Geometry and Freedom of Movement

Measure the distance from the intended mounting wall to the nearest sanitaryware (washbasin, toilet, shower). Keep at least 60 cm to 75 cm of clearance in front of the cabinet to allow comfortable standing and bending down.

Door Opening Radius and Hinge Technology

The depth of the cabinet represents only its closed dimension. When the door opens, it extends into the room. For a 25 cm deep cabinet with a 40 cm wide door, an opening angle of 95° or 110° requires a total of 65 cm of clearance from the wall. Pay attention to the installed hardware fittings. A concealed cup hinge (usually requiring a 35 mm drill hole) provides sturdy guidance. For heavily used bathrooms, a hinge with integrated soft-close damping is recommended to ensure the door closes smoothly and does not slam against the carcase.

Moisture Resistance of Materials

Bathrooms are high-humidity areas. The materials used must prevent swelling.

• Particle board: Often coated with melamine resin. Edges must be cleanly sealed (e.g. with ABS edging), as exposed cut edges of particle board swell instantly upon contact with water.
• MDF (Medium-Density Fibreboard): Denser and often painted or foiled. Highly moisture-resistant when the surface is intact.
• Back panels should not sit flush against the tiles. A small shadow gap of 2 mm to 3 mm allows air circulation and prevents mould formation.

Aesthetics and Spatial Effect

Light colours reflect light and make narrow spaces feel larger. A white bathroom cabinet or white bathroom cabinets in general are classic solutions for windowless bathrooms. Those wishing to create contrast can deliberately pair a light-tiled bathroom with a black bathroom cabinet.

Applications for Slim Cabinets

Shallow carcase depths resolve specific space constraints, not only in the bathroom.

Alcoves and Unused Walls

A narrow strip often remains between the shower and the wall or beside the washbasin. Slim bathroom cabinets fit perfectly here. When floor space is lacking, a wall-hung bathroom cabinet is the right choice. It keeps the floor clear, making bathroom cleaning considerably easier.

Vertical Storage

A tall bathroom cabinet makes optimal use of ceiling height. On a footprint of, for example, 30 cm width and 20 cm depth, a height of 170 cm yields substantial storage capacity for all bathroom essentials.

The Shallow-Depth Principle in Other Living Spaces

The need for shallow furniture is not restricted to the bathroom. Space is also at a premium in narrow hallways or compact bedrooms. Similar dimensions apply here:

• A shoe cabinet with 30 cm depth often uses drop-front mechanisms to store shoes at an angle.
• A chest of drawers with 30 cm depth or a chest of drawers with 35 cm depth is ideal as a hallway phone table or for scarves and hats in the entrance area.
• For flat-folded clothing (T-shirts, underwear), a chest of drawers with 40 cm depth or a chest of drawers with 45 cm depth is often sufficient.

If the furniture features drawers, the type of runner is decisive. A single-extension runner pulls out to approximately 75%. In very shallow chests, accessing items at the very back can prove difficult. In this case, a full-extension runner is advantageous, bringing the drawer completely clear of the carcase.

Installation and Technique: Assembling and Hanging Cabinets Securely

Assembling self-assembly bathroom cabinets requires precision. For wall-hung cabinets in particular, secure fixings are essential, as the tare weight of the timber plus the contents exert considerable tensile forces on the wall.

Required Tools

• Tape measure and pencil
• Spirit level
• Drill (rotary only for tiles, hammer action for masonry)
• Suitable drill bits (tile drill bit, masonry drill bit)
• Cross-head screwdriver (PZ for particle board screws)
• Hammer (for wall plugs)

Step-by-Step Wall Mounting

1. Determine positioning: The ideal height for a mirror cabinet positions the centre of the mirror at eye level (usually approx. 160 cm from the floor). For side cabinets, ergonomics dictate placement.
2. Mark drill holes: Use the spirit level. Measure the distance between the cabinet hangers on the rear of the carcase to the millimetre and transfer these onto the wall. Where possible, drill into the tile grout lines in the bathroom to avoid damaging the tiles.
3. Drilling and wall plugs: Use suitable wall plugs for the masonry (usually 8 mm). For stud walls (plasterboard), dedicated hollow-wall cavity anchors are essential.
4. Drive in screws: Use wood screws of adequate diameter (e.g. 5 mm). Leave the head protruding as far as required by the cabinet hanging bracket.
5. Hang and secure: Mount the carcase. Many modern cabinet hanging brackets allow fine adjustment of height and depth from inside using a small adjusting screw.

Aligning Doors (Adjusting Hinges)

Once the white bathroom cabinet is hung, the doors often hang crookedly. The adjustment screws on the hinge act as a precision steering mechanism to bring door gaps into line. A standard cup hinge features three adjustment directions:

• Height adjustment: Located on the mounting plate (the part screwed to the cabinet side wall). Loosen the screws slightly, slide the door up or down, and re-tighten.
• Lateral adjustment: The front screw on the hinge arm. Turning left or right moves the door closer to the carcase edge or further away, allowing you to set an even gap between two doors.
• Depth adjustment: The rear screw on the hinge arm. It regulates the distance between the door and the carcase. If set too tight, the door will scrape when opened; if set too far out, an unsightly gap appears.

Also consider the door overlay during assembly. A full overlay means the door covers almost the entire edge of the carcase side when closed. An inset door sits flush between the side panels.

Interior Fittings: Adjusting Shelves

Most bathroom cabinets utilise System 32, a continuous row of holes spaced at 32 mm centres. The drill holes usually have a diameter of 3 mm or 5 mm, into which shelf supports are inserted. Ensure heavy items (such as large bottles of liquid detergent) are always stored on the lower shelves to keep the centre of gravity low.

Special solutions exist for the area beneath the washbasin. Vanity unit storage typically features a waste cut-out in the top panel and upper drawers. Measure the depth and width of your waste trap accurately before assembly, as cut-out dimensions vary by manufacturer.

Frequently Asked Questions (FAQ)

What fits into a 15 cm deep cabinet? A cabinet with 15 cm depth is designed for single-row storage. Typical items include toothbrushes, toothpaste, deodorants, perfumes, medicine packets, and small cosmetic jars. It is ideal as a shallow mirror cabinet above the washbasin.

Can towels be stored in a 20 cm deep cabinet? Yes, although only small towels or guest towels. These must be tightly rolled or folded in a specific way. For large bath towels or bath sheets, a depth of at least 25 cm, preferably 30 cm, is recommended.

Which material is suitable for bathroom furniture? Because high humidity levels prevail in bathrooms, melamine-faced particle board or foiled MDF are suitable. Crucially, all edges (including non-visible rear edges) must be cleanly sealed (e.g. with ABS edging) to prevent moisture ingress into the timber.

How much clearance is required in front of a bathroom cabinet? Allow at least 60 cm to 75 cm of clear space in front of the cabinet. Also factor in the opening radius of the doors. A 40 cm wide door extends a further 40 cm into the room when fully opened.

Are wall-hung or floor-standing cabinets better in the bathroom? Wall-hung cabinets offer the major benefit of keeping the floor beneath clear. This makes mopping and vacuuming much easier and protects the carcase from standing water during overflows or floor cleaning. Floor-standing cabinets, however, are simpler to install as no drilling into tiles is required.

Which hinges are used for bathroom cabinets? Concealed cup hinges are standard. For bathroom environments, nickel-plated steel hinges are recommended to resist corrosion. Models with integrated soft-close damping prevent doors from slamming shut.

Are shallow cabinets available for other rooms? Yes, the shallow-depth concept is widely used in hallways and bedrooms. Shoe cabinets with tilting mechanisms frequently require only 20 cm to 30 cm depth. For underwear or accessories, shallow chests of drawers with 30 cm to 35 cm depth are available.

Related Categories & Guides

Find suitable hardware fittings and components for various depths and spatial layouts across our ranges:

• Bathroom cabinet depth 15 cm
• Bathroom cabinet depth 20 cm
• Bathroom cabinet depth 25 cm
• Tall bathroom cabinet
• Vanity unit storage
• Chest of drawers depth 30 cm
• Shoe cabinet depth 30 cm