Pocket-Sized, Not Puny: A Working Plan for the Downstairs Cloakroom

Photo: Dave Hitchborne, CC BY-SA 2.0, via Wikimedia Commons

Every house has one room that gets used by everybody and designed by nobody. It's the downstairs loo: the cupboard under the stairs with a pan in it, the sliver of hallway pinched off to squeeze in a basin, the space where the ironing board used to live. And yet this is the room your guests will visit on their own, shut the door behind them and form an opinion about. It deserves better than a leftover mirror and a sad bottle of hand wash.

The good news is that a cloakroom doesn't need much to work. It needs the right shapes in the right places, air that moves, light that flatters, and somewhere to put the loo roll. Get those four sorted and the styling almost does itself.

Start with the door, not the toilet

Almost every cramped cloakroom I've seen has the same origin story: somebody fitted a suite without checking how the door opens. Before you look at a single basin, stand in the doorway and watch the swing. A standard internal door needs roughly 800mm of clear floor to open comfortably, and if that arc lands on a basin, you've built a puzzle rather than a room.

Three fixes, in increasing order of effort. Swap to a sliding or bi-fold door and you reclaim the whole arc. Reverse the door so it opens out into the hall — brilliant in a tight space, though it's worth checking with your local building control if you're mid-renovation, since rules around doors onto stairs and escape routes do apply. Or accept an inward door and plan the room around the swing, keeping the pan on the far wall and the basin on the hinge side.

Aim for 700mm of clear space in front of the toilet, measured from the front of the pan to whatever's opposite. It sounds generous in a 900mm-wide room. It is. But it's the figure that stops the room feeling like a trap.

The soil pipe decides your layout

In most British houses the cloakroom sits where it does because that's where the soil stack runs. That boxed-in corner or awkward duct isn't a problem to hide — it's the design brief. Line up your sanitaryware along it and the room suddenly makes sense.

Toilet choices, plainly. A back-to-wall pan pushed up against a shallow duct works beautifully in a narrow room, because the cistern disappears into the boxing and the floor stays visually clear. A short-projection close-coupled pan is the cheap, easy win — around 600mm deep instead of the standard 700mm, which is a whole 10cm back in a space that's counting them. A wall-hung pan looks the most elegant, but the concealed frame needs somewhere to live: budget 120–150mm of depth for the frame plus the finished wall on top, unless you're building it into an existing chimney breast or boxed pipe.

For basins, forget your instinct to buy the prettiest one in the showroom. Cloakroom basins are a specific thing: usually 300–400mm of projection from the wall, sometimes with a half-pedestal to hide the trap, sometimes wall-hung with a trap cover. A corner basin is genuinely useful in a room where two walls meet badly. If you want a bit of surface for soap and a candle, look at a slim vanity unit around 400–500mm wide rather than a full-size one that eats the floor.

One rule worth breaking: don't match the toilet and basin just because they came as a set. A plain rectangular basin with a slightly softer pan often looks more considered than two identical curved pieces bought on price.

Ventilation isn't optional

A windowless cloakroom without an extractor is a damp cupboard with ambitions. It will steam up, it will smell faintly of nothing good, and eventually it will show you patchy paint around the ceiling.

Fit a proper extractor — ideally humidity-sensing, with an overrun of at least 15 minutes so it keeps pulling air after the door closes. Duct it to an outside wall by the shortest sensible route; flexible hose looped through a ceiling void, stuffed into an old flue, will move almost nothing. If you have a window, great, but keep a trickle vent open and still consider a fan. And leave a gap under the door of around 10mm so air has somewhere to come from. Fans with nowhere to draw air from simply spin.

While you're at it, get the sealant right. Mould-resistant silicone, applied to clean dry surfaces, in a room that's been allowed to dry out properly first. It's the least glamorous sentence in this article and the one that will save you the most irritation.

Light it like a room, not a cupboard

A single spotlight directly above the head is the classic cloakroom lighting mistake: it casts shadows across the face, highlights every mark on the wall opposite and makes the room feel clinical. Instead, aim for 2700–3000K warm white, ideally from a mirror light or a small wall light either side of the basin. A slim mirrored cabinet with an integrated light gives you glow and storage in one hit — just check the IP rating if it's going anywhere near the splash zone (IP44 is the usual sensible minimum).

If the ceiling's high enough, a small pendant on a short drop can make a pocket-sized room feel deliberate. And if you're leaving the door open onto a hallway, think about the sightline from the front door: whatever you see through that opening is part of the hallway's decoration whether you planned it that way or not.

Storage: shallow and specific

Cloakrooms fall apart when they become storage. The trick is to give it somewhere to store the few things it genuinely needs, so nothing else moves in.

Use the boxing. A recessed niche built into the duct, 200–250mm deep, will hold spare rolls, a small bin and cleaning bits behind a simple door or an open shelf. Above the cistern, a shelf at 150–200mm deep is enough for a spare roll and a small plant. A shallow wall cabinet over the basin, no more than 120mm deep, swallows the awkward clutter without jutting into the room. Add two hooks on the back of the door and you're done. Then keep the floor clear, because in a room this size, an object on the floor is an object you'll walk into.

Finishes that survive real use

Go for a hard floor — LVT, porcelain or a decent vinyl. Carpet in a cloakroom is a decision you'll regret quietly for years. Continuing the hallway flooring straight through is the tidiest trick available, because it makes a tiny room read as one more bit of the hall rather than a bolt-on.

For walls, moisture-resistant paint in a mid-sheen finish is more forgiving than flat matt, especially around the basin. A tiled splashback behind the sink protects the one spot that gets soaked. And skip the wallpaper on all four walls if ventilation is marginal; one papered wall is plenty of personality.

One idea, done properly

Finally, the styling. Tiny rooms reward a single strong idea and punish clutter faster than any other space in the house. Pick one: a deep earthy green on every wall, a bold small-scale print, a dark ceiling that makes the room feel like a little box of calm. Then stop.

One decent mirror, one small framed print at eye level when seated, a plant that tolerates low light (a pothos or asparagus fern will forgive you), a proper hand towel, a nice soap dispenser and a small bin with a lid. A ceramic dish for a candle. That's the entire list. Guest will notice the paint colour and the fact that there's somewhere to put their bag. They won't notice the toilet if you've got the measurements right — and that's the highest compliment a downstairs loo can receive.