Tatami, Shoji and Fusuma Care: The Washitsu Guide

Washitsu: Anatomy, Lifespans and the Real Maintenance Budget

A washitsu (和室, Japanese-style room) is built from three living materials, all made of plant fibre and paper: the tatami (tatami, straw-and-rush floor mat), the translucent sliding screen shōji (shōji, wooden lattice covered in paper) and the opaque sliding panel fusuma (襖, solid paper-covered door). None of the three lasts forever, but none of the three is expensive to renew, provided you know when to act.

That timing is what separates a calm foreign owner from an overwhelmed one. A washitsu left untouched for ten years in an empty house cannot be repaired; it has to be replaced. Maintained on schedule, it stays the single strongest charm asset of a Kyoto townhouse or a rural akiya: the room that makes the cover photo and justifies the nightly rate.

The maintenance calendar at a glance

Element	Japanese term	What wears out	Interval	Indicative cost (per unit)
Floor mat	tatami (tatami)	The woven face: yellows, frays, dips underfoot	Flip at 2-5 years, resurface at ~10 years, replace at 10-20 years	¥4,000 to ¥28,600 (~€27 to €190)
Translucent screen	shōji (shōji)	The paper: tears, sags, yellows	3 to 5 years (less with children or a cat)	¥1,500 to ¥8,000 (~€10 to €53)
Opaque sliding panel	fusuma (襖)	Surface paper, pulls, runners	8 to 15 years	¥3,000 to ¥11,000 both faces (~€20 to €73)

Hold on to the order of magnitude: fully refreshing a six-mat room, papers included, runs to hundreds of euros, not thousands. Set against an acquisition budget (where total purchase costs stay at or below 6% of the price) washitsu upkeep is a rounding error. Which is what makes the most common mistake so absurd: ripping out the washitsu for laminate flooring, when restoring it often costs three times less.

Tatami: What It Is Made Of, Regional Sizes and Where the Rush Comes From

A tatami is not a uniform slab. It is an assembly of three distinct parts, each with its own lifespan.

• The face, tatami-omote (tatami表): a mat woven from igusa (藺草, soft rush) over a cotton or hemp warp. It is the only visible part, the only one that genuinely wears, and the only one replaced in 90% of jobs.
• The core, tatami-doko (tatami床): the thick body, historically compressed rice straw, today usually fibreboard and polystyrene. It lasts 15 to 30 years and is only replaced after sagging, deep mould or water damage.
• The border, tatami-beri (tatami縁): the fabric braid stitched along the long edges. Purely decorative, replaced together with the face. Borderless mats (heri-nashi, 縁なし), square and very fashionable in contemporary renovations, cost roughly 30-50% more.

Four size standards: never order blind

The classic foreign-buyer trap is assuming tatami comes in one size. There are four regional standards, inherited from two opposing design methods: Kansai sized the house from the mats (tatami-wari), Kantō from the spacing of the posts (hashira-wari).

Standard	Japanese term	Main region	Dimensions	Area
Kyoto / Kansai	kyōma (京間)	Kyoto, Osaka, western Japan	191 × 95.5 cm	≈ 1.82 m²
Nagoya / Chūkyō	chūkyōma (Nakagyō間)	Aichi, Gifu, parts of Tōhoku	182 × 91 cm	≈ 1.66 m²
Tokyo / Kantō	edoma (江戸間)	Kantō, Hokkaidō: the most widespread	176 × 88 cm	≈ 1.55 m²
Apartment blocks	danchima (団地間)	Post-war apartment and public housing	170 × 85 cm	≈ 1.44 m²

The gap between kyōma and danchima reaches 26% of floor area. In practice, a room advertised as "6 jō" (tatami, the six-mat unit) is 10.9 m² in Kyoto and 8.6 m² in a 1970s apartment block. When you read a Japanese property listing, the mat count only means something alongside the region: the menseki (menseki (surface), floor area) in square metres remains the only comparable figure. In an older house each mat was cut for its exact position: they usually carry a mark on the underside and are not interchangeable.

Where the rush in your mat comes from

The origin of the igusa drives both price and durability. Kumamoto Prefecture, around the city of Yatsushiro, accounts for more than 90% of Japan's cultivated area and the bulk of domestic tatami-omote output; the geographical indication Kumamoto-ken-san igusa tatami-omote protects that origin. The sector is shrinking, though: according to the Ministry of Agriculture (MAFF), the 2023 season produced roughly 1.54 million mats on 351 hectares, down around 7-8% year on year. As a result, Japanese rush now covers only a minority of the market (on the order of 20%) with the balance imported, mostly from China.

Expert tip, always ask the craftsman for the origin and grade of the tatami-omote before signing the quote. Good Japanese rush holds its colour and density two to three times longer than an entry-level imported mat. On a short-let property, where the floor is walked on all year, the initial price gap pays for itself within a single cycle.

Renewing Tatami: Flip, Resurface or Replace

There are only three possible interventions on a tatami, and confusing the first two is expensive: plenty of owners pay for a full resurface where a simple flip would have done.

Ura-gaeshi: flipping the face

Ura-gaeshi (裏返し, flipping) means unstitching the woven face, turning it over to expose the untouched reverse, and restitching it with a new border. It can be done only once in a mat's life, between 2 and 5 years after installation. Later than that, the reverse has dulled through humidity too and the operation loses its point.

Omote-gae: replacing the face

Omote-gae (表替え, resurfacing) replaces the woven face and the border while keeping the core. This is the benchmark job, the one that restores the green scent and pale colour of fresh rush. It typically follows about five years after the flip, so roughly ten years after installation.

Shinchō: a brand-new mat

Shinchō (新調, new mat) replaces everything: core, face and border. It is justified when the core gives underfoot, when mould has penetrated deep, or after water damage. Budget disposal of the old mats on top.

Job	Japanese term	What is replaced	When	Cost per mat	Downtime
Flip	ura-gaeshi	Nothing: face turned over, new border	2-5 years after installation, once only	≈ ¥4,000 (~€27)	Same day
Resurface	omote-gae	Woven face + border	~5 years after the flip	¥5,500 to ¥16,800 (~€37 to €112)	Same day
New mat	shinchō	Core + face + border	Beyond 10 years, or damaged core	¥12,000 to ¥28,600 (~€80 to €190)	1-2 days plus manufacturing

Add disposal of the removed mats, around ¥1,000 to ¥2,000 per mat (~€7 to €13) in the case of shinchō. Most tatami-ya (tatami屋, tatami craftsmen) collect the mats in the morning and relay them the same evening for a flip or a resurface, so the room stays usable: which matters when you are managing a rental remotely between two bookings.

An alternative worth knowing: faces woven from washi paper or resin (often sold under brand names) cost 20-40% more upfront but do not yellow, resist stains and wipe clean with a damp sponge. On a property run as a licensed minpaku short-term rental, that is usually the right trade-off: the look still reads as authentic in photos, while maintenance collapses.

Shoji: Care and Re-Papering Without Costly Mistakes

A shōji consists of a frame and a lattice of fine wooden strips, the kumiko (組子, openwork lattice), over which a translucent paper, shōji-gami (shōji紙), is stretched. The timber lasts decades: it is the paper that lives three to five years. On an antique screen the kumiko is the valuable part: clean it with a dry or barely damp cloth, never with detergent, and never paint or varnish it, which destroys its patina irreversibly.

Which paper to choose

Paper type	Look	Lifespan	Cost per panel (pro)	Best for
Traditional washi	Visible grain, very soft light	3 to 5 years	¥1,500 to ¥3,500 (~€10 to €23)	Own home, character property
Reinforced paper (synthetic fibre)	Close to washi, smoother	5 to 8 years	¥2,500 to ¥5,000 (~€17 to €33)	Rentals, homes with children or pets
Iron-on paper	Uniform, applied with a household iron	3 to 5 years	¥200 to ¥1,500 self-applied (~€1 to €10)	DIY, emergency repair
Glazed sliding panel	Garden view through a sliding pane	Permanent	On quotation	Rooms facing a tsuboniwa courtyard garden

The top of the professional range, up to ¥8,000 (~€53) per panel, covers oversized formats, decorated papers and antique frames that require patient lukewarm-water removal without warping the kumiko.

Re-papering a shoji yourself: the five-step method

1. Lift the panel out and lay it flat on trestles, paper side up.
2. Brush water along the lattice strips to soften the old glue, wait five minutes, then peel the paper off in one piece.
3. Let the kumiko dry completely: damp wood will make the new paper buckle.
4. Apply glue to the strips and roll the paper out without tension, leaving it slightly slack.
5. Mist the whole surface with a fine spray of water: as it dries, the paper shrinks and tightens by itself. Trim along the frame with a blade.

Classic mistake: stretching the paper as you fit it. It will split at the first change in humidity. Lay it loose and let the water do the work.

Fusuma: Identify Yours Before You Renovate It

The fusuma is the opaque sliding panel that divides two rooms or closes an oshiire (押入れ, futon closet). Before any quote, one question decides everything: what is your panel made of? Technique, lifespan and cost all follow from the answer.

Type	Japanese term	Structure	Renewable?	Cost, both faces
Traditional fusuma	hon-busuma (本襖)	Timber frame and lattice, layered papers	Yes, indefinitely: layers are added or rebuilt	¥3,000 to ¥11,000 (~€20 to €73)
Cardboard-core fusuma	dan-bōru busuma (段ボール襖)	Cardboard honeycomb on a light frame	Can be papered over, but for a limited number of cycles	¥2,500 to ¥6,000 (~€17 to €40)
Foam-core fusuma	happō busuma (発泡襖)	Polystyrene foam core	Barely: the whole panel is replaced	Replacement on quotation

The test is simple: tap the panel with a finger. A hon-busuma sounds hollow and vibrates slightly; a cardboard or foam core answers dull and flat. On a hon-busuma you can glue fresh paper over the old several times before a full strip-down is needed: which is why century-old panels are still in service in traditional kominka farmhouses.

Papers and prices

The entry level, tori-no-ko (鳥の子, machine-made washi-style paper), comes to about ¥3,000 (~€20) for both faces fitted. A decorated woven textile climbs towards ¥11,000 (~€73). In between sit plain Japanese papers and discreet patterns: that band offers the best durability-to-price ratio for a rental property.

Never throw away the pulls

The hikite (引手, recessed pulls) in brass, copper or carved wood are often the only genuinely old parts of a panel. Two screws remove them; they clean up and go straight back onto the new paper. In a character property, a set of period hikite is worth more in perceived value than the entire paper job. For a painted or calligraphed panel, do not hand it to a general fitter: that is the trade of the hyōgushi (表具師, mounter-paperer), a specialist found in every historic city, one of the trades covered in our guide to architects and craftsmen for renovation in Japan.

Humidity, Mould and Dust Mites: The Routine That Saves a Washitsu

Mechanical wear is not what kills a washitsu. Humidity is. Tatami is a plant sponge: it absorbs moisture from the air in summer and releases it in winter, its thermal virtue and its Achilles heel. Two enemies wait for the opening: mould, kabi (カビ), and dust mites, dani (ダニ).

The threshold to remember: 60% relative humidity

Dust mites multiply in a band of 20-30 °C with 60-80% relative humidity: precisely the climate of a Japanese interior during the tsuyu (梅雨, rainy season) and through summer. Keeping indoor air below 60% relative humidity is enough to break the cycle. A cheap hygrometer and a programmable dehumidifier do more here than any curative treatment.

The routine that extends the lifespan

• Vacuum along the weave (tatami no me, tatamiの目), slowly, once a week. Against the grain you pull the rush strands out.
• Wipe dry, or with a very well wrung cloth followed by immediate drying. Never a soaking mop, never a steam cleaner: water reaches the core and does not come back out.
• Cross-ventilate for a few minutes daily, with two opposite windows open. It is the highest-return habit on this list.
• Air the mats twice a year in a dry season: lift each mat, stand it up or prop it on blocks, let air move for half a day. Note that airing dries but does not disinfect: thermal kill of mites requires more than 55 °C.
• Keep direct sun off the rush: it bleaches and weakens the fibre. Use a blind, a sudare (簾, bamboo screen) or a curtain during the hot hours.
• Leave nothing permanently on top: rugs, vinyl underlay, heavy furniture without pads. Anything that blocks the air exchange creates a condensation pocket where mould starts.

The empty-house problem

A property shut up for six months without ventilation is the single most destructive configuration there is, and it is exactly the situation of a non-resident owner. Three countermeasures: mechanical ventilation left running permanently on low, a dehumidifier with direct drainage, and a quarterly physical visit by a local manager. The same humidity that feeds mould also draws shiroari termites into timber houses: treating the air protects the structure as much as the floor.

Worked Example: Restoring a Six-Mat Washitsu

Take a common case: a timber house bought on the edge of Kyoto, with a six-mat Japanese room in edoma format, four shōji facing the garden and four closet fusuma. The mats are about fifteen years old, the face is dull but the core is sound; the papers are original and yellowed. The goal: a flawless result on camera, ready for rental use.

Scenario A: refresh (cores kept)

Item	Detail	Qty	Unit price	Total
Mat resurfacing	omote-gae, mid-range rush	6	¥9,000	¥54,000 (~€360)
Shoji paper	Reinforced paper, fitted by a craftsman	4	¥3,000	¥12,000 (~€80)
Fusuma paper	tori-no-ko, both faces, pulls retained	4	¥4,500	¥18,000 (~€120)
Scenario A total				≈ ¥84,000 (~€560)

Scenario B: fully new mats

Item	Detail	Qty	Unit price	Total
New mats	shinchō, core and face	6	¥18,000	¥108,000 (~€720)
Disposal of old mats	Taken to the waste centre	6	¥1,500	¥9,000 (~€60)
Shoji and fusuma papers	Same as scenario A	8		¥30,000 (~€200)
Scenario B total				≈ ¥147,000 (~€980)

What if you removed the washitsu altogether?

Converting a six-mat room to Western style (lifting the mats, building up the subfloor to make up the thickness difference, then laying timber flooring) commonly runs ¥120,000 to ¥300,000 (~€800 to €2,000), and more if lifting the mats reveals damaged joists, which is frequent in older stock.

The arithmetic is therefore decisive: the complete refresh in scenario A costs less than the low end of a flooring conversion, while keeping the one feature that genuinely distinguishes the property from a standard apartment. In a market where international travellers are buying the Japanese experience, removing the washitsu means paying to erase your own selling point. Test the impact on your yield with our rental yield simulator, and compare these figures with the ranges in our guide to the cost of renovating a machiya or kominka.

Common Mistakes and Expert Advice

The eight most expensive mistakes

1. Washing mats with plenty of water. Water passes through the face and sits in the core. Internal mould cannot be treated: it forces a full shinchō.
2. Covering them "for protection". Rugs, vinyl underlay or stick-on tiles laid over tatami block the rush from breathing and create a mould bed within months.
3. Ordering without measuring. A set of edoma mats delivered to a kyōma house leaves centimetres of gap on every side. In older buildings each mat is cut for its precise position.
4. Shutting the house up without ventilation. The number-one non-resident-owner mistake, and the only one capable of destroying the whole room in a single rainy season.
5. Varnishing or painting an antique kumiko. Irreversible, and value-destroying on a period screen.
6. Throwing out the original pulls. Antique hikite cannot be bought back; they come with the house.
7. Treating a cardboard fusuma like a hon-busuma. Water-stripping a cardboard core warps the panel permanently.
8. Choosing the cheapest face for a rental. Wear is three times faster; the initial saving is gone by the first renewal.

Five expert pointers

• Ask for the grade of the rush, not just the price. Weave density and the number of strands per mat explain most of the difference in longevity.
• Negotiate a whole-room package, mats and papers together: the call-out and the lifting are shared, and the discount often reaches 10-15%.
• Schedule it before a tenant moves in, or between seasons: a resurface is done within the day, whereas a flooring conversion takes the room out for a week.
• Get two quotes from local tatami-ya. Differences between craftsmen in the same neighbourhood regularly exceed 30% for identical work.
• Book upkeep in the operating budget, not the acquisition budget: a few hundred euros every five years, provisioned like kanrihi condominium charges. If you are starting from scratch, our Japan property purchase checklist lists what to verify before you even sign.

Conclusion: Modest Upkeep for an Asset That Stands Out

Caring for a washitsu comes down to three calendars and one principle. The calendars: flip the mats between 2 and 5 years, resurface them around 10 years, re-paper the shōji every 3 to 5 years and the fusuma roughly every 10. The principle: keep indoor air below 60% relative humidity, because it is moisture (never use) that destroys a Japanese room.

Financially the case is settled: a few hundred euros per cycle for a six-mat room, against €800 to €2,000 for a flooring conversion that would delete your main differentiator. For a foreign investor the intact washitsu is a marketing asset as much as a heritage one: it is the photo that triggers the booking and the argument that supports the nightly rate.

To go further, our complete guide to buying property in Japan covers every stage of the process, and our overview of Japanese architectural styles puts the washitsu back in context. If you are looking for a traditional property to restore, browse our selection of akiyas and character homes, see the projects we support, or talk through your plans with our advisory team: from the property search to the handover of the keys.

Frequently asked questions

How often do tatami mats need replacing?

The woven face is flipped once, between 2 and 5 years after installation, then replaced (resurfaced) about five years later. The complete mat, core included, is changed after 10 years, often 15 to 20 years in a well-ventilated house. In a short-let property, plan for the lower end of each range.

How much does it cost to replace a tatami mat in Japan?

Around ¥4,000 (~€27) for a flip, ¥5,500 to ¥16,800 (~€37 to €112) for a resurface, and ¥12,000 to ¥28,600 (~€80 to €190) for a brand-new mat. Add ¥1,000 to ¥2,000 per mat for disposal of the old ones when replacing them completely.

Can you re-paper a shoji screen yourself?

Yes; it is one of the few genuinely accessible jobs: ¥200 to ¥1,500 (~€1 to €10) of paper per panel against ¥1,500 to ¥8,000 with a craftsman. The key is to lay the paper slightly slack and then mist it with water: it tightens on its own as it dries. On a valuable antique frame, leave the stripping to a professional.

What is the difference between ura-gaeshi and omote-gae?

Ura-gaeshi turns the existing woven face over to expose its untouched reverse: the cheapest option, but possible only once and only within the first five years. Omote-gae replaces the face and border with new ones while keeping the mat core. The first extends, the second renews.

How do you stop mould growing on tatami?

Keep relative humidity below 60%, cross-ventilate for a few minutes every day, vacuum along the weave and never use water in quantity. Do not lay rugs or underlay on top, and air the mats twice a year in a dry season. In an empty house, a permanent dehumidifier is essential.

Are all tatami mats the same size in Japan?

No. Four standards coexist: kyoma (191 × 95.5 cm) in Kansai, chukyoma (182 × 91 cm) around Nagoya, edoma (176 × 88 cm) in Kanto and danchima (170 × 85 cm) in apartment blocks. The area gap reaches 26%, so a six-mat room is not the same size in every region.

Should you convert a washitsu to a Western room before renting it out?

Rarely. A flooring conversion costs ¥120,000 to ¥300,000 (~€800 to €2,000) for six mats (more than a complete refresh of the washitsu), and removes the feature international guests look for most. Better to invest in a quality mat face and good bedding.

Who do you call in Japan to renovate tatami, shoji and fusuma?

The tatami-ya, the tatami craftsman, handles the mats; the hyogushi, the mounter-paperer, handles shoji and fusuma papers, especially painted or antique panels. Both trades exist in every Japanese city and work on site; always request two quotes, as local differences often exceed 30%.