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BIM Architecture: Hiroshima's 'Spiral' Hotel Pushing the Boundaries of a Compact 35㎡ Space by CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

Hiroshima’s city center is bustling with trendy restaurants and shops, with even more retail and accommodation developments planned. To maximize the building’s profitability, the architect made full use of the narrow, elongated site spanning approximately 35 tsubo (about 115.7 square meters), a plot shape typical of urban areas. This approach minimized wasted space and resulted in a practical, rational building design that also aspires to become a local landmark.

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

The building’s structure is straightforward, perfectly fitting the site’s shape. An opening on the opposite side of the street-facing façade ensures privacy from the road, a crucial feature for accommodation facilities. The ground-floor commercial space is equipped with skylights to provide ample natural light throughout the day.

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

From a design perspective, the architect added an external spiral emergency staircase at the building’s front—a practical and legally required feature. This spiral staircase, with its handrail-defined space, introduces an organic softness to the building’s otherwise rigid rectangular form, giving it a distinctive and memorable character.

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

Night view of the building

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

BIM Architecture | Hiroshima 'Spiral' Hotel, Challenging the Narrow Limit of a 35 ㎡ Venue/CAPD

△ Plan view

Project Information

Project Type: Hotel, Retail

Location: Hiroshima City, Japan

Architect: CAPD

Area: 403 m²

Year: 2020

Photographer: Kazunori Nomura

Design Team: Kazuo Monnai, Hirokazu Ohara, Dai Tsunenobu, Kazuya Masui

Planning and Management: Breakfast

Construction: TS HAMAMOTO

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