For years, conventional wisdom held that wallpaper had no place anywhere near water, and that steam and damp would have it curling off the walls within a season. It is a myth that has deprived a great many bathrooms of a great deal of character.
The truth is more encouraging. With the right paper and a well-ventilated room, wallpaper behaves perfectly well in a bathroom, and it turns what is too often the plainest, most clinical room in the house into one with real warmth. The downstairs cloakroom in particular, which rarely sees a hot shower at all, is the best place in any home to be bold: a tiny, low-stakes jewel box begging for drama. The question is not whether you can, but how to do it so it lasts.
"The idea that wallpaper and bathrooms do not mix has deprived a lot of bathrooms of a lot of charm."
Look at what a papered bathroom actually does. Poppy in Red, from Coordonné's Victorian collection, turns a cloakroom into a jewel box, and Triana in Celadon, from Sevilla, gives a freestanding bath a soft green room to sit in. Octopoda Grand by Josephine Munsey is pure wit above a copper bath, and Calico Shell in Cobalt, from V&A Decorative Papers II, takes a chequerboard floor and a claw-foot bath somewhere properly theatrical.
The Right Paper, and the Right Spot
Two things make a papered bathroom a success: what you choose, and where you put it. For a family bathroom that sees real steam, look to the more robust washable and wipeable designs, including the many handsome vinyls made for exactly these conditions, which shrug off humidity far better than a delicate uncoated paper. Then be sensible about placement: keep paper clear of the direct splash zones around the basin, the bath and especially inside a shower, where tile or panelling will always serve you better.
The classic arrangement puts panelling or tiles on the lower half and paper above, as with Calathea, from Sanderson's Glasshouse, and Wilhelmina, from Melsetter by Morris & Co. Allurium in Day and Whispering Fern in Navy, both by Graham & Brown, show the other approach, giving the paper the drier walls and letting the wet end look after itself. Above all, ventilation is what really protects a papered bathroom: an extractor that works, or a window that actually gets opened, matters more than anything else, because it is lingering steam rather than the occasional splash that causes trouble.
"With the right paper and good ventilation, wallpaper lasts perfectly well in a bathroom."
Where It Works Best
Some treatments are near foolproof. A cloakroom can simply be papered top to toe, and the smaller the room the bolder you can afford to be. Beatrice in Light Green, from Sandberg's Herbarium, does exactly that for a washstand barely wider than itself, and Linnea in Blue, from Trädgården, proves a pretty floral is not too delicate for the job. Mystic Garden in Spa Blue, from Thibaut's Eden, shows how much a whole papered wall does for a small one, while Ivy Garland in Prune, from Coordonné's Cotswolds, is the quietest of the lot. Pure Bachelors Button the most restrained, white on cream behind a plain white bath.
Do not forget the ceiling either, which in a small enclosed room makes a gorgeous and surprising fifth wall. A bathroom is the right place for pattern you might hesitate over elsewhere, whether that is a lush tropical, a dramatic dark floral or a glamorous Art Deco. Its small scale makes a big gesture affordable, and its private nature makes it fun.
Choose a design that makes you smile on an ordinary morning, order a sample to see how it sits in the room's light and humidity, and give a bold pattern plenty of plain tile or paint to play against. Browse the whole bathroom collection to start. Done with a little thought, the bathroom stops being the room you apologise for and becomes, quite possibly, the one guests remember best.

