Wash before you soak, in clean water, in a room that’s really one waterproof volume rather than a dry room with a shower box inside it. Once you understand that premise, a deep soaking tub, a low stool and a floor drain stop looking like design choices and start looking like a system — which is what almost no post on this keyword actually explains.
Start with that premise and the layout it demands, then materials, then light and the final touches.
1. Understand the wash-then-soak premise first
You wash and rinse fully outside the tub, then step into clean water to soak — which is why the tub holds no soap and the water can be reused by the next person. Every item below follows from this; without it, a deep tub is just an expensive bath. Keeping Western habits and washing inside the tub defeats the whole design and makes the depth uncomfortable instead of restful.
2. Treat the whole room as a wet room
Fully tanked walls and floor with a floor drain, $1,500-4,000 for professional waterproofing, is what allows washing outside the tub with no enclosure — the structural decision the entire style rests on. Removing a shower screen without tanking the floor as a shortcut doesn’t work; water reaches the substrate and the ceiling below it.
3. Choose a deep soaking tub sized for sitting upright
An ofuro-style tub roughly 27-33 inches deep and often only 40-48 inches long, $1,200-4,000, is shorter and deeper than a Western tub, so it fits a small footprint while still covering the shoulders when seated. Check floor loading before buying on length alone — a filled deep tub plus a person is a serious point load on an upper floor.
4. Add a bathing stool and a hand shower
A low teak or hinoki stool, $50-150, with a handheld shower on a slide rail set low, $80-200, is where the actual washing happens in item 1’s sequence — seated, with a handheld — so it’s a functional requirement, not a prop. A fixed overhead rain head as the only shower breaks the system entirely; you can’t wash seated under one.
5. Use hinoki cypress where you can
A hinoki bath mat, stool or tub cover, $60-250, is naturally rot- and mold-resistant and releases a distinctive citrus-cedar scent when wet, delivering the room’s smell as well as its look. Skip sealing it with varnish to “protect” it, though — that blocks both the scent and the natural oils that make it water-resistant. Leave it bare and let it dry.
6. Lay a teak slatted duckboard floor section
Removable teak duckboard over the tiled floor in the washing zone, $80-250, gives warm, non-slip footing over a cold wet floor and lifts out entirely for cleaning and drying. Don’t leave it permanently in place, though — it has to be lifted regularly, or the trapped underside grows mildew.
7. Fit a linear or central floor drain
A linear channel or central drain with the floor falling toward it, $200-450, is a plumbing prerequisite, not a detail — without it, the wash-outside-the-tub sequence has nowhere to send the water. Relying on the tub’s own waste doesn’t substitute; the floor needs its own fall and outlet.
8. Use stone or pebble underfoot
Honed stone or pebble mosaic, $8-18 per square foot, with a slip rating suited to a wet floor, is both the sensory point and the safety feature in a room that’s wet across its entire floor, not just a shower tray. Skip polished stone anywhere here — it’s genuinely hazardous when the whole floor gets wet.
9. Frame a view of greenery from the tub
Position the tub to face a window with a plant, a courtyard or even a single potted maple, free if you’re planning the layout, $30-80 for the plant — the connection to a framed piece of nature is central to the tradition and what makes a long soak restful rather than boring. Siting the tub facing a blank wall or the toilet, the default in most Western layouts, wastes the opportunity.
10. Use reeded or frosted glass for light without exposure
Reeded glass or a paper-effect film on the window, $15-60, keeps daylight while removing the view in, echoing shoji screens without needing actual sliding panels. Skip genuine paper shoji in a wet room, though — the paper won’t survive the humidity; glass or a film that mimics it is the practical version.
11. Keep lighting low, warm and indirect
2700K on a dimmer, plus a low-level or cove light, $60-200, is what turns the room into somewhere you stay — a bright overhead makes soaking feel like being examined instead. A single cool-white ceiling fixture undoes every material choice made above it, so it’s worth changing first.
12. Hide all storage behind flat fronts
Closed handleless cabinetry or a recessed cupboard, $300-900, keeps visible bottles and products — the fastest way to break the room’s stillness — out of view, which makes storage a design decision here rather than an afterthought. Open shelving with products on display works in other styles, but it directly contradicts this one.
13. Fit a sliding door instead of a swinging one
A pocket or surface-sliding door in timber with a slim frame, $400-1,200, recovers the floor area a swinging door needs, which is often the difference between fitting a soaking tub and not. Skip a surface-mounted slider on a bathroom shared with guests, though — like a barn door, it seals poorly; a pocket door in the wall is the better version here.
14. Add a thermostatic refill or tub cover to hold heat
An insulated tub lid or a thermostatic mixer for topping up, $80-400, keeps the water hot enough for a real soak — the traditional slatted cover exists for exactly this reason. Don’t assume a standard acrylic tub will hold heat for a 40-minute soak on its own; either insulate it, cover it, or plan to top up.
15. Limit the palette to three natural materials
Wood, stone and plaster or plain tile, and nothing else, decided at specification time, is what produces the calm here — a fourth material is where these rooms start looking like a spa hotel instead of a Japanese bathroom. Chrome or high-gloss surfaces break the matte, natural surface logic the whole room depends on.
16. Add one living element and nothing else
A single fern, moss dish or small maple, $20-80, is the closing item and the only ornament in the room — one living thing in an otherwise spare space carries more weight than a shelf of objects, which is the principle the whole style runs on. Adding a group of plants and accessories “to finish it off” undoes the restraint items 12 and 15 just established.
Common questions
Do I need a full wet room for a Japanese-style bathroom?
For the authentic sequence in item 1, yes — but there’s an honest partial version: a deep tub plus a handheld shower and stool inside a conventional enclosure gets most of the experience without the waterproofing cost in item 2.
Will a soaking tub fit in a small bathroom?
Often better than a standard tub — see item 3’s dimensions, since these run shorter and deeper than a typical Western tub. Just add the floor-loading caution for anyone on an upper floor before ordering one, since a filled tub is genuinely heavy.
What’s the difference between Japanese and Japandi bathroom style?
Japanese here is a functional bathing system with specific fixtures. Japandi is an aesthetic blend of Japanese and Scandinavian design that may keep an entirely Western layout underneath. A separate post on this site covers Japandi across the whole home.
How do I keep wood from rotting in a wet bathroom?
Use naturally oily species like hinoki and teak, from items 5 and 6, leave them unsealed, and let them dry fully between uses by lifting duckboards and stools. Ventilation matters more here than any coating you could add.
Where to start
Buy a hinoki or teak bath stool and a hinoki mat, then sit down and wash before your next bath rather than in it. It costs under $150, needs no plumbing, and it tests whether the sequence in item 1 is something you actually want before you commit to the wet room it implies.
Browse the Bathroom archive for more, or see how 14 Curated Indoor Greenery Ideas approaches items 9 and 16, and how 17 Sage Green and Cream Kitchen Ideas holds to a restrained natural palette.