Ito Family Residence Main Building

A Prewar House on the Edge of Shimizu

Ito House Main Building (伊藤家住宅主屋, Itō-ke Jūtaku Shuoku) is a single-storey wooden house in Kamishimizu-chō, Shimizu Ward, Shizuoka City, completed in 1939 and entered on Japan's national register of Tangible Cultural Properties on 2 September 1998. It occupies a building footprint of 106 square metres under a tiled roof, and it remains a private house. There is no admission counter, no opening schedule, and no interior tour.

That last point matters more than it might seem. Japan's register was created in 1996 precisely to protect buildings that people still live in, work in, and heat in winter. Ito House was among the earliest to enter it. Its registration number, 22-0015, places it fifteenth in Shizuoka Prefecture, and it came through in the thirteenth national registration round, when the whole system was barely two years old.

The Agency for Cultural Affairs record describes it plainly: a well-preserved example of the Japanese-style houses built in the suburbs of the former Shimizu City before the war. No grand pedigree, no famous architect. The value lies in the workmanship and in how completely the rooms survived.

Registered, Not Designated: What the Category Means

English-language sources often flatten every Japanese heritage label into "cultural property," which obscures a real legal distinction. Ito House Main Building is a Registered Tangible Cultural Property (登録有形文化財), not a designated Important Cultural Property (重要文化財) and certainly not a National Treasure.

Designation is selective and restrictive: alterations require permission, and the state assumes a heavy protective role. Registration is deliberately lighter. An owner notifies the authorities before making significant changes rather than applying for consent, and in exchange receives technical guidance and some tax relief. The bargain is that the building keeps earning its keep as a functioning house.

Three criteria admit a building to the register once it is more than fifty years old. Ito House qualified under the first: contribution to the historic landscape of the country. The other two cover buildings that set a formal standard, and buildings that would be difficult to reproduce. That first criterion is the broad one, and it is why the register now holds thousands of houses, warehouses, bridges and factory sheds rather than a few dozen monuments.

Reading the Roof and the Interior

The roof is the strange part, and it is the one thing a passer-by can appreciate from the street.

Japanese domestic roofs usually commit to one form. This one does not. The eastern half is gabled (kirizuma), ending in a flat triangular wall. The western half is hipped (yosemune), sloping on all four sides. Where the two meet, the composition becomes asymmetric in a way that carpenters generally avoid, because the junction is harder to flash and harder to keep watertight. Attached to the front is a separate entrance porch roofed in irimoya, the hipped-and-gabled form usually reserved for the more formal part of a building.

Three roof types on one modest house. The likeliest reading is that the plan grew or was adjusted around an existing constraint, and the carpenter resolved it in the open rather than forcing a false symmetry.

Inside, the fittings and the ranma transoms are worked in jindai-sugi. The name means roughly "age of the gods cedar," and it refers to cedar that has lain buried in volcanic ash, mud or riverbed silt for centuries and been dug up again. Burial starves the wood of oxygen and stains it a smoky grey-green that no finish can imitate. It has never been an everyday material, and using it for transoms in a suburban house in 1939 signals a client willing to spend on quiet things that only the family would notice.

The record notes that the reception room and the other rooms are all in good condition. Nothing has been gutted.

What a Visitor Can Actually Do

Be direct about this: you cannot go inside, and you should not attempt to. The property has no listed owner in the national database, no visitor telephone number, and no published access arrangement. It sits on a residential street in Kamishimizu-chō, a short distance inland from Shimizu port. Photographing the exterior from the public road is the limit of what is appropriate, and even that is worth doing discreetly.

Shimizu Ward rewards a visit for other reasons. Miho no Matsubara, the pine grove that forms one of the component sites of the Fujisan World Heritage listing, is in the same ward and faces the mountain across Suruga Bay on clear mornings. Shimizu is roughly ten minutes from Shizuoka by JR Tōkaidō Line local train.

Readers who want to stand inside a registered building in Shizuoka Prefecture have better options nearby. The Ito City Kinoshita Mokutarō Memorial Museum, a 1907 merchant house on the Izu coast, is registered and open to the public for a small fee. In Mishima, the former Kawai family house operates as Mishima Goyomishi no Yakata and has been open since April 2005. Both give the experience that Ito House cannot.