Medicine Cabinet Buying Guide: Sizes, Mounting and Features

Key takeaways

• Always measure your basin, taps and wall space together – the cabinet width should usually be equal to or slightly narrower than the basin, and doors must clear taps and nearby walls.
• Decide early between recessed, surface-mount and corner cabinets; recessed options need wall depth and planning, while surface-mount and corner units are easier retrofits.
• Prioritise practical features for your household – families may need lockable storage boxes such as the Lockabox One lockable box, while beauty fans may value lighting, magnification and extra shelving.
• Match materials to your bathroom environment: stainless steel and aluminium cope well with moisture, while well-sealed wood suits warmer, more traditional schemes.
• Plan your budget around your layout – small bathrooms benefit from corner or slimline cabinets, while larger spaces can justify wider mirrored units that visually double the room.

Why this category matters

A medicine cabinet is far more than a place to hide toothpaste. It is one of the first things you see every morning and the last thing you use at night. Because it sits at eye level and typically includes a mirror, its size, shape and finish strongly influence how tidy, bright and spacious your bathroom feels. A well-chosen cabinet can make even a compact cloakroom feel organised and intentional, while a poor choice can dominate a small wall or look lost above a wide vanity.

There is also a safety and practicality angle. Many households now store not just plasters and painkillers, but prescription medicines, razor blades, sharp grooming tools and even cleaning products in their bathroom cabinet. If you have children, pets or vulnerable adults at home, secure storage is essential. That does not always mean an industrial-looking lockable cabinet on the wall; it could be a discreet compact lockable box inside your main bathroom cupboard, or a clear lockable container that doubles as a general safety box around the home.

From a design perspective, the right cabinet can solve storage problems without eating up floor space. Slim recessed models keep everything flush with the wall, which is particularly useful in narrow UK bathrooms and ensuites. Surface-mounted cabinets are easier to fit, and modern designs are much sleeker than the old metal boxes many of us grew up with. Corner cabinets turn awkward, unused corners into highly efficient storage, freeing up other parts of the room for radiators, towel rails or shelving.

Financially, a medicine cabinet is a relatively small investment compared with tiles, plumbing and flooring, yet it is one of the fixtures you use several times a day. Choosing wisely gives you a better return on your renovation budget. A well-made cabinet with a durable mirror, smooth hinges and easy-clean shelves will last for years with minimal maintenance, which is why thinking through sizes, mounting and features before you buy is well worth the effort.

How to choose

The best way to choose a medicine cabinet is to work through three decisions in order: size, mounting type and features. Starting with size ensures you only consider cabinets that actually fit your wall and your daily needs. Then you can decide whether you want a recessed, surface-mounted or corner solution. Only once those are set should you focus on extras like lighting, mirrors and locks – otherwise it is easy to fall for a clever feature in a cabinet that does not truly suit your bathroom.

When it comes to size, first measure the width of your basin or vanity unit, then the available wall width above it. As a rule of thumb, the cabinet should not be wider than the basin; equal width or up to about 5 cm narrower on each side tends to look balanced. Measure height from the top of your tap to where you are comfortable seeing your face – often 30–40 cm above eye level is ideal. Finally, think about depth: standard medicine cabinets range from roughly 10–15 cm deep, but slimline models are shallower, and recessed cabinets may sit largely within the wall cavity.

Next, decide how your cabinet will be mounted. Recessed cabinets sit partly or fully inside the wall, giving a streamlined, built-in look. They require sufficient wall depth and careful planning to avoid pipes and cables, so they are best considered during a renovation. Surface-mounted cabinets attach directly to the finished wall, making them the go-to choice for most retrofits. Corner cabinets mount into the junction between two walls and are particularly helpful in tight spaces where a standard cabinet would clash with a window, door frame or sloping ceiling.

Finally, shortlist the features that fit your household. If you share a bathroom, double-door cabinets can give each person a side, while adjustable shelves help you reorganise as needs change. Mirrored doors are almost universal, but some designs offer mirrors both inside and out, which is handy when you want to see behind your head while holding a hairbrush or trimmer. Consider whether you would benefit from integrated lighting, shaver sockets or demisting pads; if you do, check how they are powered and whether you will need an electrician. If you are unsure whether a particular type suits you, our overview of types of bathroom medicine cabinets offers a helpful comparison.

Measuring your over-sink space

Accurate measurements are the foundation of a successful cabinet purchase. Stand in front of your basin and measure its width at the widest point, then note any features on the wall such as light switches, extractor fans, windows, sloping ceilings or boxed-in pipes. Measure the distance from the top of the basin to any obstacle above (for example a window ledge) and the distance to the nearest wall on either side. These numbers will tell you the maximum width and height you can work with.

Do not forget depth and clearance for doors. If you have a countertop tap that projects far into the basin, you need to be sure the cabinet doors can open fully without hitting it. A simple way to check is to hold a book or piece of card at the depth of the cabinet you are considering, then simulate door swing. In very tight spaces, a sliding-door cabinet or one with a shallower body can be a smart choice. Corner cabinets can also avoid clashes with tall taps, as they sit slightly away from the centre line of the basin.

Standard and non-standard cabinet sizes

Medicine cabinets come in a broad range of sizes. Common single-door units are often around 30–50 cm wide, while double-door cabinets range roughly from 50–80 cm in width. Taller cabinets, sometimes called tallboys or column cabinets, can reach 80–120 cm high and may be better suited to mounting beside the basin rather than directly above it. Depth usually sits around 10–15 cm, enough for typical medicine bottles and toiletries, though ultra-slim designs are shallower to reduce how far they project into the room.

If your bathroom layout is awkward, such as a narrow wall between a window and a corner, you may have to look at non-standard sizes. Modular cabinet ranges can help here: some brands offer narrow units that can be combined, allowing you to create a custom width. Another tactic is to reduce what you expect to store above the sink and keep bulkier medicines in a separate container, such as a three-layer medication storage box that can sit in a cupboard, wardrobe or utility room. This lets you choose a smaller, better-proportioned cabinet for the wall while still keeping everything organised.

Common mistakes

Several recurring mistakes come up when people choose medicine cabinets, especially when ordering online. The first is underestimating how much space the cabinet will visually occupy. A very deep surface-mounted cabinet might fit on paper, but in a narrow bathroom it can feel intrusive when you lean over the basin. This is particularly noticeable in UK homes where bathrooms are often compact. Checking the depth against your existing wall projections, like radiators or towel rails, will help you avoid this.

Another common error is forgetting about doors and surrounding features. Doors need room to swing open, and double-door cabinets require even more clearance than single-door models. If you mount a cabinet too close to a side wall or shower screen, the door may never fully open, making it awkward to reach items and increasing the risk of chipped edges. Similarly, mounting the cabinet too low can cause the doors to knock on tall taps or basin mixers every time you open them.

Buyers also regularly overlook who will use the cabinet. A design that works perfectly for one adult may be unsafe or impractical for a family. For example, open shelving or cabinets without any locking option can pose a risk if you store prescription tablets or strong cleaning products. In such homes, integrating something like a clear lockable storage box inside or alongside your main cabinet can add a much-needed layer of safety for children and visitors.

A final pitfall is neglecting bathroom ventilation and the materials used. Cabinets in poorly ventilated bathrooms can suffer from condensation build-up, leading to tarnished mirrors, swelling of low-quality wood, or corrosion of cheap metal fixtures. Choosing moisture-resistant materials and ensuring you have adequate extraction will help your cabinet (and its contents) stay in good condition for longer. If you are unsure about material trade-offs, our guide on choosing between wood and metal bathroom medicine cabinets goes deeper into the pros and cons.

Quick tip: before buying, sketch the cabinet outline on the wall with low-tack tape. Live with it for a day to check that doors, taps and nearby features all have enough room, and that the height feels natural when you stand at the basin.

Top medicine cabinet options

While wall-mounted mirrored cabinets are the focus for most bathroom renovators, not every home or tenancy allows you to cut into plasterboard or drill into tiles. In some cases, you may be renting, have very slim internal walls or simply want extra secure storage alongside an existing mirror. In these situations, compact medicine storage boxes can be an excellent alternative or companion to a standard cabinet, giving you flexible, portable and often lockable storage for tablets and first-aid essentials.

Below are three popular storage options that complement or stand in for a traditional medicine cabinet. Each offers a different balance of capacity, portability and security, and can be placed inside a larger bathroom cupboard, on a high shelf or even in a separate room for extra discretion.

Lockabox One Lockable Storage Box

The Lockabox One is a clear, lockable storage box designed to keep medicines, snacks and other small items safely out of reach while still visible. With an external size of 31 x 21 x 17 cm and a capacity of around 10 litres, it is compact enough to fit inside most bathroom cupboards or on a shelf, yet roomy enough for everyday medication, plasters and small bottles. The clear sides make it easy to see what you have at a glance, which helps you avoid buying duplicates or running out unexpectedly.

A key benefit of this box is its combination lock. Instead of relying on keys that can be misplaced, you set a code that only adults or carers know. This makes the Lockabox One particularly useful in homes with children, shared houses or student accommodation, where you need a balance between accessibility and safety. On the downside, being a box rather than a wall cabinet means you do need flat storage space to place it, and you still rely on a separate mirror for everyday grooming. However, as a dedicated secure storage companion to a standard mirrored cabinet, it works extremely well.

View the Lockabox One lockable storage box for more details on sizing and usage ideas, or check current pricing and colour options if you want a secure box to complement your bathroom cabinet.

Three-Layer Portable Medicine Storage Box

This three-layer medicine storage box is designed to keep a family’s medicines and first-aid items neatly separated. Measuring approximately 34 x 22 x 24.5 cm, it offers more internal organisation than a single-compartment box. The tiered design typically provides a combination of smaller compartments for blister packs and ointments, plus deeper sections for bottles, dressings and equipment like thermometers or blood pressure monitors. A sturdy carry handle makes it easy to move between rooms, which is useful if you prefer not to store all medicines in the bathroom.

The main strength of this type of organiser is its capacity and portability. If your wall space is limited or you prefer a slimline mirror above the sink, you can keep the bulk of your medications in this box, stowed in a cupboard, wardrobe or even under the stairs. It also works well in schools, offices or holiday homes where you need a clearly defined first-aid box that can travel. The trade-off is that it does not lock by default, so if you need secure storage away from children, you may want to store it out of reach or combine it with a separate lockable unit.

You can see more about the three-layer medicine storage box here, or check reviews and specifications to decide whether a portable organiser suits your layout better than an over-sink cabinet.

DeeCozy Compact Lockable Medicine Box

The DeeCozy lockable medicine box is a compact option for anyone who wants discrete, secure storage for tablets and medical supplies. With dimensions of about 26 x 22 x 12 cm, it is small enough to slide into many bathroom cabinets, under-sink cupboards or wardrobe shelves. A four-digit combination lock on the front gives you control over who can access the contents, while a removable inner tray offers a bit of internal organisation for smaller items.

This box is particularly well suited to shared homes, flatshares and student accommodation, where private medication may need to be kept separate from general bathroom items. It is also handy if you live with children or vulnerable adults and want an extra layer of safety without advertising the presence of medicines on the wall. The downside is that capacity is relatively limited compared with a full wall cabinet or larger storage box, so it works best for essential daily medicines and a few first-aid supplies rather than bulky bottles or equipment.

If you like the idea of a small, secure container that can sit inside your existing bathroom cabinet, you can take a closer look at the DeeCozy lockable medicine box, or check current availability and colours to match your bathroom scheme.

Conclusion

Selecting the right medicine cabinet starts with a tape measure and a clear picture of how you use your bathroom. By carefully measuring your over-sink space, deciding between recessed, surface-mounted and corner options, and choosing features that genuinely match your household, you will end up with a cabinet that looks integrated, holds everything you need and stays practical for years. Do not be afraid to pair a slim or simple mirror cabinet with separate storage boxes if that suits your walls and your family better.

If your priorities include child safety or discretion in a shared home, lockable organisers such as the Lockabox One or the DeeCozy compact lockable box are worth considering alongside your wall cabinet. For households that simply need more organised space, a larger three-layer box can handle overflow medicines and first-aid supplies without crowding the bathroom.

Ultimately, a medicine cabinet is most successful when it quietly does its job: keeping essentials easy to reach, dangerous items safely out of the way, and your bathroom looking calm and clutter-free. A little planning now will help you achieve a layout that works every day, no matter how your routines and family needs change over time.