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A low museum at the end of the plaza · Pale grey metal panels above, dark brick below. The plaza meets it directly at second-floor level. ⓒ美術手帖
A low museum at the end of the plazaPale grey metal panels above, dark brick below. The plaza meets it directly at second-floor level. ⓒ美術手帖
Daily Space

A 15.9-billion-yen hall repair carried a 5.2-billion-yen museum (Saitama, museum architecture)

2026.09.19

Kawaguchi, the city just north of Tokyo in Saitama Prefecture, opened a municipal art museum on the 12th. It was not built as a standalone project. The city bolted the museum onto the renovation of a 36-year-old cultural center by the station and tendered both as one job, with one architect and one contractor.

1.Two minutes on foot from the west exit of JR Kawaguchi Station. On September 12 the Kawaguchi Museum of Art opened its doors. The opening show, "Hajimari no Hikari" (Light of Beginnings), belongs to photographer Mika Ninagawa, who grew up in this city, and runs until November 29. Adult admission on the day is 2,000 yen, about 19,000 won.
2.The design is by Koyama Atelier (香山建築研究所). The same office also handled the renovation of the building next door, the Kawaguchi General Cultural Center Lilia. The city bundled the two jobs under ECI, a method that brings the contractor in at the design stage, and it was the first time Kawaguchi had used it. The director is Akira Tatehata.
The entrance on the Lilia side · The entrance facing the cultural center. You pass between dark brick walls and enter through glass doors. ⓒSouka Kinmei (CC BY 4.0)
The entrance on the Lilia sideThe entrance facing the cultural center. You pass between dark brick walls and enter through glass doors. ⓒSouka Kinmei (CC BY 4.0)
3.The museum sits on the plot just west of Lilia, on top of what used to be a car park. There are only three levels: the first floor, the second floor and a mezzanine (M2) between them. The entrance is on the second floor. Step in from the plaza and a central atrium opens up, ringed by two galleries, a restaurant, a shop and a multipurpose room. The mezzanine holds an exhibition hall and a library.
Second-floor plan (visitor map) · The entrance leads straight into the atrium, with Galleries 1 and 2, the restaurant and the shop wrapped around it. ⓒ川口市立美術館
Second-floor plan (visitor map)The entrance leads straight into the atrium, with Galleries 1 and 2, the restaurant and the shop wrapped around it. ⓒ川口市立美術館
4.The galleries are not large. Gallery 1 is 371㎡, Gallery 2 is 155㎡ and the mezzanine hall is 298㎡. Together that makes 824㎡, about 250 pyeong. It is on the small side even for a regional museum, so a special exhibition that takes all three rooms leaves no wall for the permanent collection.
The opening section of the show · A first room divided by black partitions, each photograph lit on its own. ⓒ美術手帖
The opening section of the showA first room divided by black partitions, each photograph lit on its own. ⓒ美術手帖
A white-walled gallery · Another room on the same floor has white walls and a dark timber floor. One partition changes the temperature of the room. ⓒ美術手帖
A white-walled galleryAnother room on the same floor has white walls and a dark timber floor. One partition changes the temperature of the room. ⓒ美術手帖
5.Press photos show the gallery floors laid with wide, dark timber boards and the ceilings pressed down in black. Only the white walls catch the light, and everything above sinks into shadow. The atrium ceiling is cut deep like an upturned funnel, and light drops from the bottom of that well. Part of the interior uses cast iron, the city's traditional industry. Kawaguchi made its name pouring molten iron into moulds.
Mezzanine plan (visitor map) · One exhibition hall, a corridor gallery and the library. The grey areas are closed to visitors. ⓒ川口市立美術館
Mezzanine plan (visitor map)One exhibition hall, a corridor gallery and the library. The grey areas are closed to visitors. ⓒ川口市立美術館
6.Lilia is the station-front cultural center that opened in July 1990. A 2,002-seat main hall, a 600-seat music hall and a 14-storey tower make up one complex of about 36,000㎡. Over 36 years the plumbing and air conditioning wore out, and above all the suspended ceilings in the large halls failed current seismic standards. Without the work, the halls would have had to close.
The Lilia tower, built in 1990 · The tower wing of the station-front cultural center. With the hall wing it adds up to about 36,000㎡. ⓒEbiebi2 (CC BY-SA 3.0)
The Lilia tower, built in 1990The tower wing of the station-front cultural center. With the hall wing it adds up to about 36,000㎡. ⓒEbiebi2 (CC BY-SA 3.0)
7.The city council record shows exactly what kind of package this was. An opposition member told the plenary session that "the Lilia renovation cannot be avoided, but we cannot support building the museum." Yet the budget came as a single item. There was no way to pass the renovation alone and vote down the museum.
8.Why did the city want a museum at all? A city of about 600,000 people had no municipal art museum, while works entrusted by local collectors and artists kept piling up. As of January this year the collection stood at about 220 works, including modern painters such as Kiyokata Kaburaki and Taikan Yokoyama. Handing the opening show to a photographer who grew up here follows the same logic. The building only works if the neighbours queue up.
Planted slope beside the entrance · The existing hill was kept and planted as a slope. Station-front apartment towers rise behind. ⓒSouka Kinmei (CC BY 4.0)
Planted slope beside the entranceThe existing hill was kept and planted as a slope. Station-front apartment towers rise behind. ⓒSouka Kinmei (CC BY 4.0)
9.The total budget approved by the council in March 2023 was 21.56 billion yen, about 200 billion won. Within it, the Lilia renovation takes about 15.9 billion yen and the new museum about 5.2 billion yen. The museum's share is less than a quarter of the whole. Early on, the city had set a target of 21 billion yen or less.
한 번에 올린 예산, 미술관은 4분의 1 2023년 3월 의회 통과 기준 · 단위 억 엔 · 총사업비 215.6억 엔에는 설계·관리비 등이 따로 들어 있다 리리아 개수 약 159 미술관 약 52 리리아 연면적 약 3만 6천㎡ · 1990년 개관 · 매단 천장 내진 보강과 설비 교체 미술관 전시실 3곳 합계 824㎡ · 주차장이 있던 땅 위 신축 운영비를 표로만 메우려면 시의회 답변의 연 운영비 약 3억 엔을 개관전 당일 일반 관람료로 나눈 단순 계산 연 운영비 3억 엔 관람료 1장 2,000엔 필요한 표 15만 장 / 년 기획전 수입은 공동 주최사와 나누는 경우가 많아, 실제로 필요한 관람객은 이보다 많다.
Budget split and running costsThe construction money was approved in one go, but the museum carries its running costs alone every year.
10.Bundling buys more than a vote. With one architect, the circulation and building services of both buildings can be matched on one set of drawings. With one contractor, the site office, temporary works and cranes are shared. Public figures do not reveal how much was saved. Still, renovation costs only surface once you open things up, and ECI, which seats the contractor at the design table, works to cut the risk of cost overruns.
11.The harder part comes after completion. The city told the council the museum will cost about 300 million yen a year to run. Covering that with 2,000-yen tickets alone would mean selling 150,000 a year, the equivalent of one in four residents coming once every year. Is that realistic?
12.Public museums rarely cover their running costs from tickets. This one attached the restaurant and shop to the entrance floor. The restaurant slot went to Azzurri Arte, an Italian place cooking with local produce. The layout is meant to draw people up to the second-floor plaza even if they skip the exhibition, and the museum's own slogan is "a museum like a park."
Lilia's renewed second-floor atrium · Reopening banners hang beneath the curved balconies. Photographed in May this year. ⓒSouka Kinmei (CC BY 4.0)
Lilia's renewed second-floor atriumReopening banners hang beneath the curved balconies. Photographed in May this year. ⓒSouka Kinmei (CC BY 4.0)
13.Around 1990, at the tail end of the bubble, Japan's regional cities raced to build large cultural halls in front of their stations. Those buildings are now passing 30 all at once, and their suspended ceilings and services are due for replacement. The usual choice is to fix them or close them. Kawaguchi chose to fix and add one more thing while it was at it.
14.The museum was not always meant to sit next door. In the city's early studies the candidate site was the former Sakaecho Community Hall (栄町公民館). Built there, the museum would have had no reason to be bundled with the renovation, and no case for handing both to one contractor under ECI. Only after the museum moved beside Lilia could the two jobs fit into one budget.
The museum linked to the plaza (rendering) · Drawn so the pedestrian plaza runs straight to the museum's entrance level. ⓒ日建設計コンストラクション・マネジメント
The museum linked to the plaza (rendering)Drawn so the pedestrian plaza runs straight to the museum's entrance level. ⓒ日建設計コンストラクション・マネジメント
15.The sequence follows the same thinking. Lilia finished its works and reopened first in July, while the museum held a preview opening in April before its full opening in September. Cross the plaza from the station and a 2,002-seat hall stands on one side, the museum entrance on the other. Concertgoers see the exhibition posters on the same plaza.
16.A museum rode along on the job of fixing a 36-year-old station-front hall, and its share came to about 5.2 billion yen of a 21.56 billion yen total. Korea, too, has culture and arts centers built around 1990 that are reaching the age for major renovation. But a public art museum there must first pass a separate feasibility pre-assessment by the Ministry of Culture, Sports and Tourism. Even if you try to carry a new facility through the council on a renovation budget, what trips you up first is not the construction cost but the schedule of that assessment.
Daily Space #050 · 2026.09.19
Sources. 美術手帖 「川口市立美術館が開館。蜷川実花の『はじまり』をたどる特別展で幕開け」(2026.9), TECTURE MAG 「香山建築研究所が設計した〈川口市立美術館〉が9/12開館」(2026.8.14), Kawaguchi Museum of Art official site (floor map, exhibition guide), Kawaguchi City 「川口総合文化センター大規模改修および美術館建設基本設計」, Nikken Sekkei Construction Management project page 「川口総合文化センター・リリア」, 日本工業経済新聞社 「川口市は総合文化センターリリア大規模改修と美術館建設をECI方式で進める」, 埼玉新聞 「JR川口駅前のリリア、2月末から一時休館…2年間の大規模改修へ」, Council report by Kawaguchi city councillor Daisuke Sakamoto 「リリアの大規模改修に美術館建設を載せて215億6000万円」, みんなの経済新聞ネットワーク 「川口市立美術館が開館」(via Yahoo! News), Wikipedia 「川口市立美術館」.
Won conversions at 930 won per 100 yen. Nikken Sekkei CM lists the new building at 11,184㎡ (two basement levels to 2F), but the early plan was about 4,300㎡, so the text uses gallery areas only. The 300 million yen running cost is the council answer as relayed in a councillor's report, and 150,000 tickets is a simple division by the admission price. The cost effect of bundling could not be verified because no figures are public.