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Nikki Sekkei

Japanese architectural design and construction supervision firm headquartered in Kita-ku, Osaka, handling redevelopment, high-rise and large-scale building projects.

Last updated September 15, 2026

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Overview

Nikki Sekkei (株式会社 日企設計) is an architectural design firm headquartered in Kita-ku, Osaka, Japan. According to its company profile, it was founded on December 1, 1976, with stated capital of 50 million yen, and its representative is Junseki Tamaoka, Chairman & CEO. The firm describes itself as handling architectural design, architectural planning, basic and detailed design (design, structure, facilities), construction supervision, urban planning, and related services. It states that it is one of the few design firms entrusted with redevelopment projects and super-high-rise buildings, and that it has worked across collective housing, commercial buildings, resort facilities, hospitals, banks, office buildings, hotels, schools, welfare facilities, and logistics warehouses. It reports branch offices in Tokyo, Nagoya, Fukuoka, and Okinawa, and a headcount of 368 employees.

History

Nikki Sekkei (株式会社 日企設計) states that it was founded on December 1, 1976. Its company profile lists stated capital of 50 million yen and Junseki Tamaoka as representative. The firm describes itself as having grown into a design office representing Japan, guided by the company motto "Be a person, serve!" (人となれ、奉仕せよ!). It reports that it has carried out architectural design and supervision for condominiums, housing, office buildings, hotels, commercial facilities, hospitals, welfare facilities, schools, logistics warehouses, factories, sports facilities, various leisure facilities, and store interiors, and that it has branch offices in Tokyo, Nagoya, Fukuoka, and Okinawa.

Products and positioning

Self-described as one of the few design firms entrusted with redevelopment projects and super-high-rise buildings, and as having grown into a design office representing Japan.

  • Architectural design

  • Construction supervision

  • Urban planning

  • Basic design / detailed design (design, structure, facilities)

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