The Traditional Japanese House, Room by Room

What a traditional Japanese house actually is

A traditional Japanese house is not a decorative style, it is a structural system. A timber frame of posts and beams, joined by mortise and tenon, carries every load; the walls carry nothing, which is precisely why they slide. Everything else follows from that: rooms that change function during the day, light filtered through paper, permanent ventilation, a floor lifted clear of damp ground, and a roof with deep overhangs that keeps rain off the timber.

The general term is minka (民家, literally house of the people): ordinary housing, as opposed to lordly residences. When it is old, it becomes a kominka (kominka, old house); the trade usually draws the line at 1950, the year of the Building Standards Act (kenchiku kijun-hō, kenchiku kijun-hō). In town, the same logic produces the machiya (machiya, terraced townhouse), narrow at the front and remarkably deep; in the countryside, the nōka (農家, farmhouse), wide and low under an enormous roof. For telling the styles apart we have a dedicated guide to Japanese architectural styles.

What is actually for sale today

Architectural theory says nothing about the market. Here is the state of our own catalogue on 20 August 2026, across 4,973 tracked listings in 46 prefectures.

Family	What it is	Where you find it	Listings tracked	Median price
Detached house (kodate, 戸建)	The everyday stock, from a 1930s farmhouse to a 1995 suburban build, timber-framed in the vast majority of cases	Everywhere, mostly rural	4,580	¥4,950,000 (about 30,600 euros)
Kominka (kominka)	Old house with heavy timber frame, often with an earthen-floored doma and exposed roof structure	Countryside, valleys, old market towns	238	¥8,900,000 (about 54,900 euros)
Machiya (machiya)	Terraced townhouse, narrow frontage, internal courtyard	Mostly Kyoto, also Kanazawa and Nara	110	¥75,800,000 (about 467,900 euros)

The contrast between those three rows is the first lesson of this article. A rural kominka trades for the price of a small provincial flat in Europe, while a Kyoto machiya has become a heritage asset in a tourist centre, restored and priced accordingly. These are not two quality levels, they are two markets. You can compare real properties in each family on our kominka for sale and machiya for sale pages, or browse the whole stock in our akiya listings.

One last piece of context: more than half of Japan's housing stock is timber-framed, and the 2023 Housing and Land Survey counted roughly 9 million vacant homes, a vacancy rate of 13.8%. An affordable traditional house is therefore not a lucky find, it is a structural situation.

Frame, foundations and roof: what holds the house up

In front of an old house the order of inspection is not negotiable: first what carries it, then what keeps water out, and only then what decorates it. A sound frame forgives an ugly kitchen; the reverse is never true.

A post-and-beam frame

The method is called zairai kōhō (在来工法, conventional post-and-beam construction). Vertical posts (hashira, 柱) receive horizontal beams (hari, 梁); in older houses these are joined by cut joints, with no steel brackets. Corner posts running in one piece from ground to roof are called tōshi-bashira (通し柱, through posts), and their presence is a good sign of overall rigidity.

What to look for during a viewing: a post that is not truly vertical, a floor that dips towards one corner, sliding doors that no longer close (the best spirit level you will ever own), fine sawdust at the foot of timbers. That last one means termites, a subject covered in our article on shiroari termites in Japanese timber houses.

Foundations that look nothing like ours

In traditional construction the posts simply rest on stones (ishiba-date, 石場建て) without being tied down: in an earthquake the house slides and dissipates energy instead of resisting it. Current code requires a concrete footing and mechanical anchoring, and a stone-based frame can only be built today through a specific structural calculation.

The practical consequence for a buyer: a pre-1950 house is almost always in a legally non-conforming existing state (kizon futekikaku, 既存不適格). It remains perfectly legal and habitable, but heavy works can trigger an obligation to upgrade. The next milestone date is 1 June 1981, when the reinforced seismic standard came into force, which we cover in the 1981 seismic standard (shin-taishin).

The roof: the line item that decides everything

A traditional Japanese roof projects far beyond the walls (noki, 軒, the eaves), and that overhang is not ornamental: it keeps driving rain away from the walls and the timber. Three coverings are common.

Covering	Indicative life	Order of magnitude of works	Worth knowing
Kawara clay tiles (kawara)	50 to 100 years for the tile, 20 to 30 for the substrate	Relaying existing tiles: ¥900,000 to ¥1,700,000 (5,600 to 10,500 euros). Full replacement: ¥1,200,000 to ¥2,500,000 (7,400 to 15,400 euros)	The tile outlives the substrate: tiles can often be lifted, the underlay renewed, and the same tiles put back
Sheet metal (bankin, 板金)	20 to 30 years	¥700,000 to ¥1,300,000 (4,300 to 8,000 euros)	Often laid over a tired roof, which hides the problem rather than solving it
Thatch (kayabuki, 茅葺)	20 to 40 years	Counted in millions of yen; a full re-thatch frequently exceeds ¥10,000,000 (61,700 euros)	Few remaining craftsmen, long site. Never buy one without a quotation first

Those ranges are market orders of magnitude including scaffolding, for an ordinary detached house; the item-by-item breakdown is in our guide to kawara roofing and what it really costs. The point to remember: on a house priced at ¥3,000,000, a roof to redo is half the purchase price again. That is not a closing detail, that is the negotiation.

The threshold: genkan and doma, two rooms Europe does not have

A Japanese house does not open onto a hallway, it opens onto a change in level. It is the first thing a visitor sees, and the first thing a foreign buyer misreads.

The genkan

The genkan (玄関, sunken entrance) is a paved airlock set lower than the floor. You take off your shoes there, step up over a threshold beam (agarikamachi, 上がり框), and enter. This is not decorative ritual: it is the filter that keeps damp, mud and dust away from the tatami. A cramped or badly lit genkan costs real money on resale and in short-term rental, as we explain in our article on the genkan and what it costs to rework.

What it teaches during a viewing: the height of the step tells you the depth of the crawl space, and therefore how well the underfloor is ventilated. An agarikamachi that has blackened or sagged points to damp rising through the genkan slab.

The doma

The doma (土間, earthen-floored work room) is the working half of a rural house: a floor of stabilised earth or lime mortar (tataki, 三和土), often open all the way to the roof structure, with an old cooking stove (kamado, 竈) against one wall. It sometimes takes up a third of the ground floor.

It is the largest pocket of value in a kominka, and nobody sees it at first glance because it is always full of clutter. A doma becomes an open kitchen, a workshop, the common room of a guesthouse, a garage. Two caveats: it is uninsulated and it sits on the ground, so any conversion needs a damp-proof barrier, a subject we handle in damp and mould in Japanese houses. And that magnificent ceiling height is also a volume to heat.

The washitsu: tatami, tokonoma, oshiire and how rooms are measured

The Japanese room proper is called washitsu (和室, Japanese-style room): tatami floor, sliding partitions, an alcove, built-in storage. A traditional house has two to four of them, usually in a row separated only by removable panels, so an entire enfilade can be opened up for a reception or a funeral.

Tatami measure the room, not just the floor

In Japan a room's size is given in mats, the jō unit (tatami). The catch is that the mat is not the same size everywhere.

Format	Dimensions	Area of one mat	A six-mat room is	Region
Kyōma (京間)	955 x 1,910 mm	1.82 m²	10.9 m²	Kyoto and western Japan
Chūkyōma (Nakagyō間)	910 x 1,820 mm	1.66 m²	9.9 m²	Nagoya and the Chūbu region
Edoma (江戸間)	880 x 1,760 mm	1.55 m²	9.3 m²	Tokyo and eastern Japan
Danchima (団地間)	850 x 1,700 mm	1.45 m²	8.7 m²	Post-war apartment blocks

The same six-mat listing therefore means 10.9 m² in Kyoto and 8.7 m² in a 1970s block, a 25% gap. To limit abuse, the property advertising code requires at least 1.62 m² to be counted per jō in an advertisement; that is a regulatory floor, not the reality of your mats. The other unit to know is the tsubo (tsubo), worth two mats or roughly 3.3 m², used mainly for land and for price per tsubo. Our guide to reading a Japanese property listing covers the other notation traps.

Tokonoma, oshiire, butsuma

• Tokonoma (床の間, display alcove): a raised recess holding a hanging scroll and a flower arrangement. It marks the place of honour in the room. It uses floor area and many foreign buyers remove it, which is usually a mistake: it is exactly what sets the property apart in short-term rental.
• Oshiire (押入, futon closet): a deep cupboard, around 90 cm, split by a mid-height shelf and designed for folded bedding. Too deep for a European wardrobe, but remarkable storage capacity.
• Butsuma (仏間, family altar room or recess): the place for the butsudan (仏壇, household Buddhist altar). If the altar is still in the house, do not move it yourself: the seller's family normally holds a deconsecration ceremony before the sale. Asking about it politely during the viewing makes an excellent impression.

Routine upkeep of these rooms is modest and predictable: roughly ¥5,500 to ¥16,800 (34 to 104 euros) per mat to resurface, ¥12,000 to ¥28,600 (74 to 177 euros) for a brand new mat. The detail is in our guide to maintaining tatami, shoji and fusuma.

The alcove has a guide of its own: what a buyer should know about the tokonoma, from its seven named parts to the cost of removing one.

Sliding partitions and envelope: fusuma, shoji, amado, engawa

This is where the traditional house charms you and where it punishes you. Sliding partitions make the plan fully reconfigurable; they provide neither insulation, nor security, nor acoustic privacy.

Element	Function	Thermal value	Typical refresh
Fusuma (襖)	Opaque sliding partition between two rooms	Near zero, it is a timber frame faced with paper	Repapering ¥3,000 to ¥11,000 (19 to 68 euros) for both faces
Shōji (shōji)	Translucent screen facing outside or a veranda	Cuts glare, does not cut cold	Paper ¥1,500 to ¥8,000 (9 to 49 euros) per panel
Ranma (欄間)	Carved openwork transom above the partitions	Negative: it moves warm air from room to room	Can be blocked off in winter
Amado (雨戸)	Solid sliding storm shutters kept in a side box	A genuine gain once closed at night	Freeing up the runners, a few tens of thousands of yen
Engawa (縁側)	Timber veranda between garden and rooms	A buffer space, the one traditional element that genuinely insulates	Deck boards repaired case by case

The engawa deserves a pause: it is an in-between room, neither inside nor out, which shelters the shōji from rain, shades the facade in summer and creates an air gap in winter. When a listing shows a long timber veranda opening onto a tsuboniwa courtyard garden, what it is really showing you is the climate control system of the house.

The thermal truth, plainly

An unimproved traditional house is cold. Single glazing, no wall insulation and permanent underfloor ventilation were designed for the humid summer, not for January. Heating was done locally, room by room, and still is in many households. The good news is that upgrading is targeted and effective: adding a second layer to the openings and insulating floor and ceiling changes everything without touching the frame. Current price ranges and subsidies are gathered in our guide to insulating a Japanese house.

The wet rooms: where the money actually goes

Japanese has one word for kitchen, bathroom, toilet and laundry: mizumawari (mizumawari, literally what turns around water). In an old house these four are almost always in a rear extension, poorly insulated, and they absorb most of the renovation budget.

Item	What you find in an old house	Typical cost to redo
Bathroom	Tiled tub on a slab, often with no modern waterproofing, freezing in winter	Prefabricated pod (unit bath, ユニットバス) installed: ¥800,000 to ¥1,500,000 (4,900 to 9,300 euros)
Kitchen	A stainless counter against a wall, often in the doma or an enclosed veranda	Complete kitchen: ¥700,000 to ¥1,500,000 (4,300 to 9,300 euros)
Toilet	Dry or pit toilet in older rural houses	Conversion to a flush toilet with washlet seat: ¥200,000 to ¥400,000 (1,200 to 2,500 euros)
Sewage	An ageing jōkasō (浄化槽, individual treatment tank), or a pit needing emptying	Full treatment tank for 5 people: ¥800,000 to ¥1,200,000 (4,900 to 7,400 euros), before removal and subsidies
Services	Steel pipework, undersized consumer unit	Plumbing and electrical rework: ¥500,000 to ¥1,500,000 (3,100 to 9,300 euros)

Sewage is the item foreign buyers discover last, because it is invisible and never appears in photographs. Many municipalities subsidise the replacement of a treatment tank, sometimes heavily, and annual servicing is compulsory: it is all explained in our article on jōkasō sewage treatment for a Japanese house.

Expert advice: never order the wet rooms before the roof, termites and damp have been dealt with. A new bathroom fitted under a leaking roof gets done twice. The correct order is always structure, water, services, then finishes. Our guide to machiya and kominka renovation costs prices each of those stages.

Worked example: the real budget for a 1958 kominka

Take a case typical of what we see in our listings: a 1958 country house, 110 m² of living space on a 320 m² plot, 25 minutes from a station in a western prefecture, advertised at ¥5,500,000 (about 34,000 euros). Tiles in place but a tired substrate, a cluttered doma, four washitsu, the original bathroom, a 1990s treatment tank.

Item	Amount in yen	Euro equivalent
Purchase price	¥5,500,000	34,000 euros
Acquisition costs, capped at 6% of price	¥330,000	2,000 euros
Lifting and relaying tiles, new underlay	¥1,400,000	8,600 euros
Preventive termite treatment	¥180,000	1,100 euros
Prefabricated bathroom pod	¥1,100,000	6,800 euros
Kitchen and toilet	¥1,000,000	6,200 euros
New treatment tank, old one removed	¥1,100,000	6,800 euros
Floor and ceiling insulation, secondary glazing on 8 openings	¥1,600,000	9,900 euros
Resurfacing 20 mats, new paper on shoji and fusuma	¥260,000	1,600 euros
Total	¥12,470,000	77,000 euros

Three lessons read straight off that table. First, the works exceed the purchase price, which is the rule and not the exception on an unimproved traditional house. Second, acquisition costs stay modest: in Japan they are capped at around 6% of the price, far below European transfer taxes, as detailed in our article on buying costs for Japanese property. Third, not one line of this budget is an aesthetic whim: it is all structure, water or energy.

To test your own scenario, our yield simulator and price map use the same assumptions for works and running costs. And if you are funding from abroad, remember that a Japanese mortgage assumes you are resident and employed in Japan; without that, the purchase is a cash purchase, a point developed in mortgages in Japan for foreign buyers.

The seven most expensive mistakes in front of a traditional house

1. Buying the frame and forgetting the location. An exceptional frame 50 minutes from the nearest station will not rent and will not resell. The deciding criterion is still distance to a served station and the presence of shops, not the beauty of the timber.
2. Mistaking picturesque for sound. A weathered facade can hide a post foot eaten by termites. A freshly repainted house can hide exactly the same thing. Only an inspection of the crawl space and the post feet settles it.
3. Leaving the roof out of the negotiation. It is the one item capable of doubling the cost of a cheap property. Get a quotation before the offer, not after.
4. Stripping out traditional elements by reflex. Ripping out the tatami, the tokonoma and the shōji to lay laminate and fixed walls is expensive and erases precisely what differentiates the property in short-term rental.
5. Overlooking water and sewage. A treatment tank at the end of its life, no connection to a public sewer, a private spring that is not drinking water: three common rural situations, none of them visible in a listing.
6. Believing that buying grants residency. Property ownership gives no visa in Japan, whatever the amount invested. The real routes are set out in buying a house in Japan without a visa.
7. Signing without reading the important matters explanation. The jūyō jikō setsumei (jūyō jikō setsumei, explanation of important matters) is the mandatory briefing the agent must give you before signing: easements, natural hazards, utilities, planning constraints. It is the document that reveals what a viewing cannot, as we explain in the jūyō jikō setsumei and what to look for.

Expert tip for the viewing: ask to open every sliding partition, to get into the crawl space through the hatch in the doma or the kitchen, and to see the house on a rainy day. Those three reveal in an hour what a file will not say in ten pages. Our renovation case studies follow two real projects from start to finish.

In short: a house you read before you buy

The traditional Japanese house is a coherent object: every element answers a problem of climate or use. The overhanging roof protects the timber, the raised floor escapes the damp, the sliding partitions adapt the plan to the season and the occasion, the genkan filters the outside, the engawa tempers. Visited by someone who can read those elements, it stops being scenery and becomes a diagnosis.

The buying logic fits in three lines. Structure and roof decide whether the property is buyable at all. Wet rooms and sewage decide the budget. Location decides the value in ten years. Charm decides nothing, but it will make the difference the day you rent it out or sell it.

To move from theory to real properties, browse our akiya and traditional house listings, compare with our overview of property in Japan, or read the complete guide to buying property in Japan. If you would rather be guided from search to handover, immoJapon's buyer support starts with a first written exchange, with no commitment.

Frequently asked questions

What defines a traditional Japanese house?

A timber post-and-beam frame, a raised floor, non-load-bearing sliding partitions and a roof with deep overhangs. It is not a decorative style but a structural system built for humid summers and earthquakes.

What is the difference between minka, kominka and machiya?

Minka means ordinary housing in general. Kominka means an old minka, with the trade usually drawing the line at 1950. Machiya means the terraced townhouse, narrow at the front and very deep, typical of Kyoto.

How much does a traditional Japanese house cost?

On 20 August 2026, across our catalogue of 4,973 listings, the median is ¥4,950,000 (about 30,600 euros) for a detached house and ¥8,900,000 (about 54,900 euros) for a kominka. Restored Kyoto machiya are a market of their own, with a median near ¥75,800,000 (about 467,900 euros).

Is an old Japanese house safe in an earthquake?

It depends on the date. Buildings from 1 June 1981 onwards follow the reinforced seismic standard. Older houses can be strengthened, but the assessment must be made by a professional before purchase, never assumed.

Why are Japanese rooms measured in tatami mats?

The mat has been the modular unit for centuries: a six-mat room is described as six jo. Be careful, mat size varies by region, from 1.45 m² to 1.82 m², which is up to a 25% difference for the same mat count.

Can a traditional Japanese house be insulated?

Yes, and without touching the frame. The fastest gains come from adding a second layer to the openings, insulating floor and ceiling, and putting the solid storm shutters back into service. Exposed-frame walls are dealt with last.

Which works cost the most in an old Japanese house?

The roof and the wet rooms, far ahead of everything else. A roof replacement commonly runs ¥1,200,000 to ¥2,500,000 (7,400 to 15,400 euros), and kitchen, bathroom, toilet and sewage together often exceed ¥3,000,000 (18,500 euros).

Can a foreigner buy a traditional house in Japan?

Yes, with no restriction on nationality or residence, in full freehold ownership of both building and land. However the purchase grants no right of residence, and Japanese mortgages remain limited to residents employed in Japan.