Japanese Architecture Basics: Tatami, Shoji and the Genkan

Japanese interiors have become one of the most copied looks in Indian homes. Japandi living rooms, Zen bedrooms, slatted screens, low platform beds and paper-like lamps appear on every mood board. Yet most of what is copied is the surface: a colour palette, a few wooden slats, a bonsai on a console. The traditional Japanese house was not a style. It was a building system, worked out over many centuries, in which a single floor mat fixed the size of every room, sliding panels replaced most walls, and the act of entering a home was organised around taking off shoes. Understanding that system is what separates a convincing Japanese-inspired interior from a themed one.

The system is also surprisingly close to Indian habits. Indians remove shoes at the door, sit on the floor for meals and prayers, value natural ventilation in hot and humid weather, and use the same room for different purposes through the day. A traditional Japanese room did all of this. What does not translate directly is the material: tatami straw and paper screens were made for a different climate and a different relationship with dust. In Surat's monsoon, a real rush-covered tatami mat can grow mould within weeks if the room is closed and air-conditioned only part of the day.

This article explains the three elements that define the Japanese house — the tatami, the shoji and the genkan — together with the related ideas of the tokonoma, the engawa and ma. It gives the real dimensions, shows how rooms are planned in mats, explains how sliding panels actually run, and then turns each element into practical guidance and indicative costs for Indian apartments and bungalows.

Where the Japanese house came from

Japan's building tradition grew out of timber, rain and earthquakes. Early buildings were raised on posts to keep floors dry, with large thatched or bark roofs whose deep eaves threw rain clear of the walls. The shrines at Ise, which are ritually rebuilt on an adjacent site roughly every twenty years, preserve an ancient form of this raised timber architecture. The important point for designers is that the Japanese house was always a frame building: posts and beams carried the roof, so walls did not have to carry loads. Once walls were not structural, they could slide, open or disappear.

During the Heian period (794–1185) the aristocracy lived in shinden-zukuri complexes: a main hall and linked pavilions around a garden, with polished wooden floors, few fixed partitions and portable screens, blinds and curtains to define space. Mats were used as loose cushions to sit or sleep on, not as wall-to-wall flooring. Over the following centuries, and especially in the Muromachi period (1336–1573), the shoin-zukuri style developed in the houses of warriors and temple residences. This is the style that fixed most of what we now think of as a Japanese room: tatami covering the whole floor, square-cut posts, sliding fusuma and shoji, a coffered or flat board ceiling, and a formal alcove — the tokonoma — with staggered shelves beside it.

The tea ceremony then pushed design in a quieter direction. The sukiya-zukuri style, which drew on the rustic tea house, used natural, sometimes irregular timber, earthen walls and very restrained detailing. The Katsura Imperial Villa in Kyoto, built in the seventeenth century, is the best-known example, and it later fascinated modern European architects; the German architect Bruno Taut wrote admiringly about it after visiting in the 1930s. Alongside these refined houses stood the minka, the farmhouses and town houses of ordinary people, with an earth-floored working area called the doma beside raised rooms. The doma is the direct ancestor of the modern genkan.

From the Meiji period (1868 onwards) Western furniture, chairs, beds and brick or concrete construction entered Japanese cities, and after the Second World War mass housing turned the Japanese home into the compact apartment. Many modern flats now have wooden or vinyl floors throughout, with perhaps one tatami room — the washitsu — kept for guests, prayer, children's play or the occasional futon. The genkan, however, survived almost everywhere. Even the smallest studio apartment in Tokyo has a small lowered entry where shoes are left.

The tatami: the mat that measured the house

A tatami is a rectangular floor mat with a proportion of almost exactly two to one. Traditionally it has three parts. The core, called the tatami-doko, was made of rice straw compressed and stitched into a firm slab; today it is often made of insulation board, polystyrene foam or wood-fibre board, sometimes in combination with straw, which makes it lighter and less attractive to insects. The cover, the tatami-omote, is woven from igusa, a soft rush whose fresh green colour fades to a golden straw tone over a few years and gives a new room its distinctive grassy smell. The long edges are bound with a cloth tape called the heri, which can be plain black, coloured or patterned; formal rooms once used the edge pattern to signal rank.

A traditional mat is roughly 55–60 mm thick, which means a tatami room is often finished slightly higher than the adjoining corridor or wooden floor, or the subfloor is lowered to suit. Thin modern mats of about 15–30 mm are made for laying over existing floors in apartments. Because the mat is firm but slightly springy, people sit, kneel, sleep and eat on it; the floor was furniture. That is also why shoes were never worn on it, and why stepping on the heri edge was traditionally considered poor manners — it wore out the binding first.

Regional sizes: not one tatami but several

The tatami is the closest thing Japan had to a standard building module, but it was never a single size. Different regions grew different conventions. In the Kyoto area the house was laid out so that the mats were a fixed size and the columns were placed around them, which produced the large Kyōma mat. In the Kantō region around Edo (Tokyo), the plan was set out on a grid of column centres, and mats were then cut to fit the space left between the columns, which produced a smaller mat. The Chūkyōma size from the Nagoya area sits between them, and post-war public housing introduced a still smaller mat for compact flats. The sizes below are the commonly quoted ones; individual mats are often custom-cut to a room, so a real room should always be measured.

The column grid behind the mat is the ken, traditionally six shaku. A shaku is about 303 mm, so one ken is about 1820 mm. Half a ken, about 910 mm, became the standard width of a sliding panel, a corridor and a cupboard. Even today, Japanese plywood, plasterboard and many building components are sized around the 910 × 1820 mm module, in the same way that Indian sheet materials are sized around 2440 × 1220 mm. When a designer in Japan says a room is 'six mats', every builder understands its size, its door positions and the cupboards that will fit.

Counting rooms in mats

Rooms are named by the number of mats, using the counter jō. A yojōhan is a 4.5-mat room — the classic tea room and small study. A rokujō, six mats, is the standard bedroom. A hachijō, eight mats, is a generous living or guest room. Japanese property listings still describe room sizes in jō even when the floor is wood, using a conventional area per mat of roughly 1.6 m². For Indian readers, a six-mat room is about the size of a 10 × 11 ft bedroom, and an eight-mat room about 12 × 12 ft.

How tatami are laid

The arrangement of mats followed rules as well as geometry. In everyday rooms, mats are laid so that their corners meet in a T, never with four corners meeting at a single point; the four-corner pattern was associated with misfortune and was avoided in homes, and in practical terms a T-junction also locks the mats together better. The 4.5-mat room places a half mat at the centre with four full mats around it in a pinwheel. Where a room has a tokonoma, the mat beside it is usually laid parallel to the alcove so that no mat edge points into it. These are cultural conventions, not structural rules, but they are worth respecting in any room that claims to be Japanese.

Shoji and fusuma: walls that slide

If the tatami fixed the floor, sliding panels defined the walls. A Japanese room is bounded on most sides not by masonry but by panels that run in grooved timber tracks and can be slid aside or lifted out completely, so that two or three rooms become one for a festival, a funeral or a summer breeze. Two kinds of panel do most of the work.

The shoji is the translucent panel. It is a light timber frame filled with a fine lattice of thin wooden bars, the kumiko, with washi — a strong, fibrous Japanese paper — pasted over one face. Shoji usually stand on the outer side of a room, between the tatami floor and the engawa veranda or the window, and they turn harsh daylight into an even, shadowless glow. The novelist Jun'ichirō Tanizaki's essay In Praise of Shadows is the best-known description of how this soft, low light shaped Japanese taste. The fusuma is the opaque panel. It has a lattice core covered on both faces with thick paper or cloth, often painted, and it divides rooms from each other or closes cupboards. Fusuma give visual privacy but very little acoustic privacy; traditional houses accepted that.

Both panels run in the same way. The lower track, the shikii, is a timber sill with shallow grooves; the upper track, the kamoi, is a timber lintel with deeper grooves. To remove a panel, it is lifted up into the deep upper groove until its foot clears the shallow lower one, then swung out. Two grooves side by side let two panels pass each other; four panels in a two-ken opening can therefore be stacked to open half of the wall at a time. Above the kamoi, a carved or latticed transom panel, the ranma, often lets air pass between rooms even when the panels are shut.

Traditional dimensions follow the ken grid. A sliding panel is typically about half a ken wide, roughly 880–955 mm depending on the regional module, and the clear height up to the kamoi in older houses was commonly around 1750–1800 mm; modern Japanese houses raise this to around 2000 mm to suit taller occupants. A shoji frame is light — often around 30 mm thick — and the kumiko are slender enough that the whole panel can be lifted with one hand. The lower part of many shoji has a solid wooden kick panel, the koshi, which protects the paper from feet and brooms.

The genkan: where the outside ends

In a Japanese home, the most important threshold is not the front door but a step a little way inside it. The genkan is the entrance area just behind the door, and its floor is lower than the rest of the house. Visitors and family step in from outside on to this lower floor, which is usually finished in stone, tile or concrete, take off their shoes there, and then step up on to the raised wooden floor of the house in socks or slippers. The edge where the floor rises is called the agarikamachi, and it is often marked by a single handsome timber. The rule is simple and absolute: outdoor shoes stay on the lower level; nothing from the street goes up.

The genkan descends from the doma of the farmhouse, the beaten-earth area where cooking, work and storage happened at ground level beside the raised living rooms. As houses became urban and compact, the doma shrank to a small entry, but the change in level survived because it did a real job. It keeps dust, mud and rainwater out of the living floor, it makes it impossible to forget to remove shoes, and it gives the house a ceremonial moment of arrival. A shoe cabinet, the getabako, stands beside the genkan, and slippers wait on the raised floor facing into the house. Guests' shoes are often turned to face the door, ready to be stepped into when leaving.

The step itself varies. Older houses, which were raised well above the ground for ventilation, often had a tall step that needed an intermediate stone; modern Japanese houses usually have a step of roughly 150–200 mm, and barrier-free homes reduce it or replace it with a gentle ramp while keeping a clear change of floor material. Apartments manage with even smaller changes, sometimes just a few centimetres, because the building slab is flat.

Indian homes have their own versions of this threshold. The old pol houses of Ahmedabad and the towns of Gujarat have an otla, a raised platform at the front of the house where people sat, talked and left footwear before entering; many South Indian houses have the thinnai, a raised veranda platform beside the entrance. The habit of leaving shoes at the door is universal across India. What Indian flats usually lack is the planning: shoes pile up on the landing outside the door, or in a rack that blocks the door swing. A genkan-style foyer fixes this by drawing the line clearly and giving shoes, keys, bags and umbrellas a proper home.

Tokonoma, engawa and ma: the quieter ideas

Three further ideas complete the picture. The tokonoma is a shallow alcove in the main tatami room, raised slightly above the floor, where a hanging scroll and a single flower arrangement or object are displayed and changed with the seasons. It is the room's focal point and its place of honour; guests are seated with their back to it. Beside it there is often a recess with staggered shelves, the chigaidana. The Indian equivalent is obvious: the pooja niche or a single artwork lit softly, which is why tokonoma-like niches appear so often in Japandi and Zen interiors on this site.

The engawa is the narrow timber veranda that runs along the outside of the tatami rooms, under the deep eaves and outside the shoji. It is corridor, sitting place and buffer zone at once: it shades the rooms, keeps rain off the paper screens and gives a place to sit with the garden. Indian architecture has many relatives of the engawa — the verandahs of Kerala houses, the otla of Gujarat, the colonial bungalow's deep verandah — and all of them do the same climatic job.

Ma is harder to translate. It is the Japanese idea of meaningful interval: the pause between notes, the empty floor between objects, the gap between a person and a wall. In a room, ma is created by restraint — fewer objects, more clear floor, a low line of furniture that leaves wall space visible above it. It is not the same as minimalism, which is about removing; ma is about spacing what remains so that each thing can be seen. In practice, an Indian living room achieves ma when its seating keeps a clear centre, when the walls are not lined edge to edge with cabinets, and when storage is closed so that the visible objects are few and chosen.

Using Japanese elements in Indian homes today

The present-day question is not whether a Japanese idea is beautiful but whether it survives Indian conditions: monsoon humidity, fine dust, hard water, high sun, lizards and insects, joint-family use and a cleaning routine that involves a lot of water. The tatami is the most fragile in this respect. Rush mats absorb and release moisture, and in a humid city a closed room or a room cooled by air-conditioning only at night can see mould on the underside of the mats. Real tatami are best kept for rooms that are well ventilated, used daily and sunned occasionally, or replaced by tatami-style alternatives.

In most of Aaditya Interior's Japanese-inspired projects the tatami becomes a raised timber platform of about 300–450 mm, with storage drawers or lift-up boxes underneath and loose mats, cotton dhurries or cushions on top that can be removed and aired. The platform is sized on a mat module so that standard mattresses and cushions fit, and its height doubles as seating. The shoji becomes a sliding panel in solid wood or veneered frames with an infill that tolerates humidity: laminated glass with a paper or fabric interlayer, frosted or fluted toughened glass, or polycarbonate. The genkan becomes the planned foyer described above.

Light is the second consideration. Shoji glow because Japanese windows face gentle, diffused northern light much of the year and because the paper scatters it. A west-facing Indian window in April delivers far more heat and glare than any paper can handle. A shoji-style screen in India therefore works best inside a properly shaded window — behind a chhajja, an external louvre or at least a reflective glass — and should be thought of as a light diffuser and privacy screen, not as the only protection from the sun.

The future: modular, flexible and climate-aware

Much of what made the Japanese house remarkable is exactly what contemporary design is trying to recover. The tatami and the ken grid are an early form of modular coordination: every component fitted every room because everything was sized on the same module. Indian factory-made modular carpentry is moving in the same direction, with standard carcass widths and panel sizes, and the logic of planning a room around a known module — a 2440 × 1220 mm sheet, a 600 mm cabinet, a 1830 × 1980 mm king mattress — is the same logic the Japanese builder applied to the mat.

Flexibility is the second lesson. Smaller apartments in Indian cities need rooms that change use: a study that becomes a guest room, a living room that opens to a dining space for a family function and closes for privacy. Well-made sliding partitions on top-hung tracks do in an apartment what fusuma did in a Kyoto house. The third lesson is climate. Deep eaves, raised floors, cross-ventilation and light screens are passive cooling strategies that rating systems such as IGBC and GRIHA now encourage under other names. Japanese architects working today continue to reinterpret these ideas in timber, steel and glass, and Indian designers can borrow the principle without copying the costume.

Seven rules for a convincing Japanese-inspired interior

• Start with a module: plan platforms, screens and cupboards on a repeating dimension (for example 900 or 1200 mm) so that the room has the calm order of a mat grid.
• Keep floors clear and furniture low, but keep mattress and seat heights comfortable for elders — about 450–500 mm for a bed top in a family home.
• Use real tatami only in ventilated, daily-used rooms; otherwise build a platform with removable, washable mats.
• Choose shoji infills that tolerate humidity — laminated or fluted glass, or polycarbonate — and fix them inside a shaded window.
• Run sliding panels on top-hung tracks with a floor guide, not on a deep floor track that collects dust in Indian homes.
• Plan the entrance as a genkan: a durable floor in the first 900–1200 mm, a 350 mm shoe cabinet, a bench and a clear line where shoes stop.
• Give the room one focal niche — a pooja shelf, a scroll-like artwork or a single object — and leave the walls around it quiet.

Frequently asked questions

What is the standard size of a tatami mat?

There is no single standard. The common sizes are about 955 × 1910 mm (Kyōma, Kyoto), 910 × 1820 mm (Chūkyōma, Nagoya), 880 × 1760 mm (Edoma, Tokyo) and 850 × 1700 mm (Danchima, public housing). Traditional mats are around 55–60 mm thick; thin mats for apartments are about 15–30 mm. Mats are often made to measure for a specific room.

What is the difference between shoji and fusuma?

Both are sliding panels running in grooved tracks. Shoji are translucent: a wooden lattice covered on one face with washi paper, used mainly on outer walls and windows to diffuse daylight. Fusuma are opaque: a core covered on both faces with thick paper or cloth, used between rooms and as cupboard doors.

Why is the genkan lower than the rest of the house?

The lower floor descends from the earth-floored doma of the farmhouse. It keeps dirt and water on the entrance level, makes the moment of removing shoes unmistakable, and stops outdoor shoes from ever touching the living floor. Modern houses usually keep a step of about 150–200 mm; apartments may have only a few centimetres.

Can tatami be used in Indian homes?

They can, but with care. Real rush tatami need ventilation and dry conditions; in humid cities like Surat or Mumbai they can grow mould in closed or intermittently air-conditioned rooms. A raised timber platform with removable cotton or jute mats gives the same look and the same floor-sitting habit with far less maintenance.

How many square feet is a 6-mat room?

A 6-mat room is about 8.7 to 10.9 m² depending on the mat size, which is roughly 94 to 117 sq ft — close to a 10 × 11 ft Indian bedroom. An 8-mat room is about 11.6 to 14.6 m², roughly 124 to 157 sq ft.