The Storehouse of Hyakunen-ya: Thirty-Nine Square Metres of Argument About Weather
The storehouse occupies the southeast corner of the Hyakunen-ya property in Tosayamada, Kochi Prefecture. It covers 39 square metres. Two storeys, earthen-walled, tile-roofed, with its ridge running north to south and its entrance on the west side under a lean-to canopy.
Those are the registry facts, and they sound unremarkable until you consider where the building stands. Kochi faces the Pacific across the Shikoku mountains and takes the full arrival of the typhoon season. Rain here does not fall so much as travel sideways. A dozo, a storehouse built of thick mud walls finished in lime plaster, is a superb thing in dry Nara and a problem in wet Tosa: water finds the plaster, works behind it, and the wall begins to fail from within.
Everything interesting about this small building is a response to that problem.
The registry dates it to the middle of the Taisho era, somewhere in the 1912 to 1925 range. It went on the national register on 1 December 2003 as number 39-0124, alongside the main house and three other structures on the same plot.
Drip Tiles, Set Roofs, and Grey Plaster
Look at the walls first. Projecting bands of tile run horizontally across the plaster at intervals, each one a small roof in miniature throwing water clear of the surface below. These are mizukiri-gawara, drip tiles, and they belong to Kochi in a way they belong nowhere else. Travel the old towns of Tosa and you find them banding storehouse after storehouse, three courses, four, sometimes five, stacked up a wall like ledger rules. They are a local invention against a local weather.
Look next at the roof, which is not sitting where you expect it to. The tiled roof is built as an okiyane, a "set roof," a separate timber structure raised above the mud roof of the storehouse proper with an air gap between the two. The gap ventilates, keeps the mass of earth beneath from cooking in summer, and puts a second layer between the contents and the sky. The eaves are cut deep for the same reason: shade in August, shelter in September.
Then the corners. At the upper corners of the walls the builder laid stone facing in a manner the registry compares to sangi, the alternating long-and-short corner bond that Japanese castle masons used to stack the vulnerable angle of a stone wall. Applied to a merchant's storehouse in the 1910s, this is quotation. The corner is the part of any plastered wall most likely to chip, and it is also the part most visible from the street.
Finally the colour. The plasterwork uses white lime alongside nezumi-shikkui, grey plaster, literally "mouse plaster." Two tones, deliberately set against each other on a 39-square-metre building.
Why the Criterion Was Different
Japan's registration system for cultural properties, created by the 1996 amendment to the Law for the Protection of Cultural Properties, offers assessors three grounds. A structure may be registered because it contributes to the historical landscape of the nation, because it sets a standard in design, or because it would not be easy to reproduce.
The main house at Hyakunen-ya was registered on the first ground: it holds up the streetscape. The storehouse was not. It was registered under the second criterion, as a work that sets a standard in design.
That distinction is the whole reading of this building. The assessors were not saying the storehouse fits its town, though it does. They were saying the design decisions in it are worth other people copying. The Agency's own commentary uses the word soi, inventiveness, about the exterior treatment, which is not a word that appears often in these entries.
Consider what that means for a structure this small. Nobody required the two-tone plaster. Nobody required the castle-mason quotation at the corners. The drip tiles and the set roof are functional, but their arrangement, the intervals, the depth of shadow they throw, is a compositional matter, and someone in Taisho-era Tosayamada took it seriously enough that a national assessment body noticed ninety years later.
Seeing It
The storehouse stands at the southeast corner of the property, which is a two to three minute walk from JR Tosayamada Station on the Dosan Line. The site now operates as Hyakunen-ya BASE, a whole-house rental guesthouse that opened to bookings in May 2022, so the grounds are private and there is no general admission.
The exterior of the ensemble can be taken in from the surrounding streets, and the storehouse is the element that best rewards a close look. Come at a low sun, morning or late afternoon, when the drip tiles throw their bands of shadow down the plaster and the two greys of the wall separate properly. In flat noon light they merge.
Guests of the guesthouse have the run of the property. Anyone else should view from the public way and respect the privacy of those in residence.
Kochi's storehouse tradition extends well beyond this one building. The old streets of Sakawa and the merchant quarters of Aki carry drip-tiled walls in some quantity, and the Kochi Castle Museum of History in the prefectural capital sets the regional context for anyone who wants it.
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Q&A
- What are the tile bands running across the walls?
- They are mizukiri-gawara, drip tiles. Each projecting band throws rainwater away from the plaster below it, protecting the earthen wall. They are a regional characteristic of Kochi, where typhoon rain drives horizontally against building faces.
- What is an okiyane or "set roof"?
- It is a separate timber-framed tiled roof raised above the mud roof of a storehouse, with an air gap between them. The gap ventilates and insulates, and the upper roof takes the weather. The registry records this storehouse as having an okiyane in sangawara pantile.
- Can I visit the storehouse?
- The property is a private residence operating as the Hyakunen-ya BASE guesthouse. There is no general admission. The exterior of the site can be viewed from the public street.
- Why is the storehouse registered under a different criterion than the main house?
- The registration system offers three grounds. The main house was registered for contributing to the historical landscape; the storehouse for setting a standard in design. The Agency for Cultural Affairs singled out the inventiveness of its exterior treatment.
- How old is the storehouse compared to the main house?
- The main house dates from 1890 and was relocated to this plot around 1917. The storehouse is recorded as mid-Taisho, roughly 1912 to 1925, so it is the later building and may have been raised at or after the relocation.
Basic Information
| Name | Hyakunen-ya Kura (Storehouse of Hyakunen-ya) |
|---|---|
| Reading | Hyakunen-ya Kura |
| Category | Registered Tangible Cultural Property (Structures) |
| Registration number | 39-0124 (39th round) |
| Registration date | 1 December 2003 (public notice 25 December 2003) |
| Criterion | Setting a standard in design |
| Quantity | 1 building |
| Period | Taisho era, mid-period (1912-1925) |
| Structure | Earthen-walled storehouse construction, two storeys, tiled roof; building area 39 m² |
| Features | North-south ridge, gabled, entrance on west elevation under lean-to canopy; okiyane set roof in sangawara pantile with deep eaves; white and grey lime plaster; stone facing at upper corners in sangi manner; drip tiles |
| Type | Residence / building |
| Location | 2-80 Higashihonmachi, Tosayamada-cho, Kami City, Kochi Prefecture |
| Access | Approx. 2-3 min walk from JR Tosayamada Station (Dosan Line) |
| Public access | Private property operating as the Hyakunen-ya BASE guesthouse; no general admission. Exterior visible from the street |
| Related structures | Main house (39-0123), Gate (39-0125), Inner wall (39-0126), Outer wall (39-0127) |
References
- National Cultural Properties Database, Agency for Cultural Affairs: Hyakunen-ya Kura
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00003767
- Cultural Heritage Online: Hyakunen-ya Kura
- https://bunka.nii.ac.jp/heritages/detail/116847
- National Cultural Properties Database, Agency for Cultural Affairs: Hyakunen-ya Shuoku (main house)
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00003766
- Comprehensive Database of Archaeological Site Reports, Nara National Research Institute for Cultural Properties: Hyakunen-ya Kura
- https://sitereports.nabunken.go.jp/ja/cultural-property/494794
- Hyakunen-ya BASE official site
- https://www.hyaku-nenya.com/
Last verified: 2026.07.16