Built-In Storage for Bathrooms and En-Suites: What’s Possible and What Isn’t

Bathroom storage in London homes is chronically underdesigned. Most bathrooms have a wall cabinet above the basin, a shelf inside the shower, and a towel rail — and that’s it. Everything else ends up on the edge of the bath, under the basin in an open void, or spread across a windowsill. The result is the kind of visual chaos that a well-designed bathroom should specifically not produce. And yet genuinely good bathroom storage — built-in, fitted, properly considered — remains relatively rare, partly because bathroom joinery is seen as a specialist undertaking and partly because most homeowners don’t know what’s actually achievable.



Built-in bathroom storage is a different discipline from bedroom or living room joinery, but it uses the same underlying principles: made-to-measure furniture fitted to the exact dimensions of the room, designed around how the space is actually used. The differences are in materials and construction — moisture is the factor that doesn’t exist in bedroom furniture, but governs everything in a bathroom context. At Humphries Cabinets, bathroom storage projects use the same bespoke approach as any other room, with material specifications that are appropriate for the humid environment. This guide covers what’s possible, what isn’t, and what to think about before commissioning built-in bathroom storage.

Material Requirements: Why Bathrooms Are Different

The core challenge in bathroom fitted furniture is moisture. Bathrooms cycle through significant humidity shifts — from high steam during a bath or shower to normal ambient levels when the room is cool and ventilated. This cycling causes materials that aren’t specified correctly to move, swell, delaminate, or deteriorate. Standard MDF, which works well in bedrooms, is not suitable in a bathroom environment unless it is moisture-resistant MDF and is sealed on every surface, including cut edges. Unprotected MDF edges in a bathroom will swell and fail within a year or two of installation.



The better material choices for bathroom fitted furniture are moisture-resistant MDF (MRMDF) with all edges and surfaces sealed with a waterproof paint or lacquer finish, or solid timber species that tolerate humidity well — oak and teak being the most common. PVC-wrapped boards offer another option: they won’t swell or delaminate because the PVC skin is impermeable, but they have limited paint adhesion and fewer design options. For a hand-painted fitted bathroom vanity or storage unit, MRMDF with a full sealed finish is the most practical choice that still allows the design flexibility of a bespoke painted piece.

Hardware in a bathroom environment also needs to be specified appropriately. Standard steel drawer runners corrode in humid conditions. Stainless steel or fully coated runners with sealed bearings are the correct specification. Hinges, handles, and any fixings within the unit should be non-corrosive — solid brass, stainless steel, or quality chrome plated. Using the wrong hardware in a bathroom fitted unit is a common cause of failure that shows up well after installation, usually when a drawer becomes stiff or a hinge starts to rust.

Under-Basin Vanity Units

The most common form of built-in bathroom storage is the under-basin vanity unit — a fitted cabinet that runs under and around a countertop basin, concealing the plumbing and providing storage in the space below. Unlike a standard pedestal basin, a vanity unit removes the exposed pipe runs, hides cleaning products and spare towels, and gives the bathroom a significantly more resolved appearance. In a small bathroom or en-suite, this single piece of fitted furniture often has the largest visual impact per centimetre of any change you can make to the room.



The configuration of an under-basin vanity depends on the basin type and the plumbing position. A countertop basin on a flat shelf with plumbing feeding through the wall behind gives the most flexibility for storage below. A basin with the waste and supply pipes running down through the floor rather than out through the wall makes a full drawer configuration more difficult — the pipes run through the middle of the storage space. A designer who understands bathroom plumbing can advise on the configuration that works around your specific pipe positions without requiring plumbing to be moved.

Drawer storage under a basin is more functional than cupboard storage in most cases. A drawer presents its contents at once when opened; a cupboard under a basin requires reaching in and around the waste pipe to find things at the back. If a cupboard door configuration is necessary due to plumbing positions, adding a pull-out basket or shelf system inside the cupboard dramatically improves usability. These are the details that get resolved at the design stage and that make the difference between storage you actually use and storage you avoid.

Recessed Shelving and Shower Niches

One of the most space-efficient forms of bathroom storage is a recessed niche — a shelf or set of shelves built into the wall rather than projecting from it. A recessed shower niche, for example, sits within the thickness of the wall and provides bottle and product storage without reducing the internal dimensions of the shower enclosure. Done well, it looks like it was designed into the building. Done poorly — or added as an afterthought after tiling — it looks exactly like that.



Recessed niches need to be planned before plastering and tiling, not after. The opening needs to be formed in the wall at the right stage of construction, waterproofed correctly, and tiled as part of the main tiling programme so that the grout lines run through consistently. This is why bathroom storage is best thought about during a bathroom renovation or new build, not as a retrofit. Adding a recessed niche to a fully tiled bathroom means removing existing tiles, forming the opening, waterproofing, retiling, and blending the new tiles with the existing work — a significant job that is far more complex than the niche itself.

Recessed shelving can also work on bathroom walls outside the shower zone — beside a basin, above a bath, or in an alcove. In these positions, the waterproofing requirements are less stringent (no direct water contact), but moisture-resistant materials are still the right specification. A painted timber shelf in a shallow recess beside the basin, with a thin strip of LED lighting underneath, is a simple and effective solution that looks considered without requiring complex construction.

What Doesn’t Work: Honest Limitations

Built-in bathroom storage has real limits. Solid timber carcase construction is not appropriate in wet zones — directly inside a shower enclosure, or against a wall that receives regular water splashing — regardless of how it is finished. Timber is hygroscopic; it absorbs moisture and moves. In a wet zone, even well-sealed timber will eventually fail. Wet zone storage needs to be tiled, stone, or fabricated from materials designed specifically for continuous water exposure.



Heavily ventilated bathrooms with no extract fan are a challenging environment for any built-in storage. Without proper ventilation, condensation builds up on cold surfaces, including the back of a vanity unit and the underside of shelves. Specifying an extractor fan — ideally one rated for the bathroom’s volume and positioned to draw air away from the shower — is not just a building regulation requirement but a genuine protection for any fitted furniture in the room. A bathroom without adequate ventilation will age any storage unit faster than the materials should.

What Humphries Cabinets Offers

Humphries Cabinets designs and installs bespoke fitted furniture across London, including for bathrooms and en-suites, using moisture-resistant materials and appropriate hardware for the bathroom environment. Under-basin vanity units, fitted storage around bath surrounds, and recessed shelving in appropriate positions are all within the standard design and build process. See Cupboard for general fitted storage and contact the team to arrange a free consultation for your bathroom project.

Frequently Asked Questions

Why Choose Humphries Cabinets

Bathroom fitted furniture is not more complicated than bedroom furniture — it just requires the right material specifications and an understanding of the humidity environment. At Humphries Cabinets, the bespoke approach that produces great bedroom wardrobes applies equally to bathroom and en-suite storage: made to the exact dimensions, designed around how the room works, and built from materials that will last.

Get in touch to discuss your bathroom storage project and arrange a free design visit.