Urban Prism Ostal by Nobuaki Miyashita is a highly esteemed winner of the very prestigious 2025 A' Design Award de Bronze in Arquitectura Competition Category.

BronzeArquitectura· 2025

Urban Prism Ostal

by Nobuaki Miyashita

Client: Aida Sekkei Co., Ltd.

A' Design Award de Bronze Winner in Arquitectura Category

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The Design

About Urban Prism Ostal

Text del libre: Urban Prism es un ostal de tres estatges bastit dins una zòna urbana densa de Tòquio, Japon. L'estructura de fusta cobrís una susfàcia totala de 127,82 mètres carrats sus un terren de 100,13 mètres carrats. Los murs de delimitacion e un portal forman una zòna tampon que fa dintrar la lutz e l'aire dins l'interior. Una cort espandís lo salon cap a l'exterior, e de grasilhas ajustablas contrarolan l'intimitat e la lutz del jorn. Un revestiment en fibrociment texturat vestís l'exterior, mentre que lo parquet de casse, l'acièr e lo veire modèlan l'interior. La forma escultural respond a las reglamentacions localas d'altor e de recuolament.

The Recognition

About the A' Design Award de Bronze

Urban Prism Ostal a ganhat la distincion A' Design Award de Bronze, una reconeissença plan prestigiosa acordada a de designs excellents que se destrian per la creativitat, l'engenh e la finessa. Los ganhaires del Bronze son d'artefactes largament abils e sorprenentament creatius que provan la vasta experiéncia, l'imaginacion e l'engenhositat de lors designers. S'espèra que Urban Prism Ostal siá un objècte fòrça considerat, admirat e estimat, notablament professional e innovant. Aqueste design ganhaire de la distincion A' Design Award de Bronze integra las melhoras practicas de l'art, de la sciéncia, del design e de la tecnologia e es excellent per son atencion al detalh. Urban Prism Ostal satisfa esplendidament los besonhs, toca los desirs, encanta los sentiments e interèssa la curiositat.

Behind the Design

Press Kit

Credits, team members and technical details provided by the designer.

Unique Properties: Urban Prism balances privacy and openness in a dense urban setting. The design utilizes boundary walls and a gate to create a buffer zone filled with light and air, seamlessly connecting the interior and exterior. Japan’s strict height and setback regulations shaped its refined, sculptural form. A courtyard extends the living space, while adjustable screens regulate privacy and daylight. Black bamboo and upward lighting enhance the entrance, evoking a Japanese aesthetic.
Dimensions & Packaging: Site Area: 100.13 Square meters
Building Area: 57.64 Square meters
Total Floor Area: 127.82 Square meters
Structure: Wood
Number of Floors: 3 above ground
Eaves Height: 8.53 m
Ceiling Height: 2.50 m
Tags: architecture, house, urban design, natural light, spatial composition, sustainable living
Production Technology: The house employs durable materials suited to urban environments. Textured fiber cement siding accentuates light and shadow interplay, reinforcing depth. The interior harmonizes solid wood, steel, and glass, blending modernity with warmth. Oak flooring enhances the tactile experience. High-performance insulated glass and movable screens optimize daylight, ventilation, and privacy. The exterior cladding ensures longevity, requiring minimal maintenance over time.
Design Challenge: The greatest challenge was balancing privacy and openness within strict urban zoning constraints. Japan’s stringent height and setback regulations required innovative volumetric manipulation to maximize livable space. Socially, the project had to address urban density while maintaining tranquility. Externally, material selection was limited by durability and maintenance concerns. Advanced simulations optimized daylight and airflow, ensuring a harmonious spatial experience.
Research: Type of Research: Architectural design research
Research Objectives: Optimization of urban housing through spatial and environmental adaptability
Methodology: Model testing, daylight and airflow simulations
Data Collection: On-site analysis, material performance tests
Results: Established a refined approach to urban privacy, integrating zoning constraints into design solutions
Inspiration: The project transforms zoning constraints into design potential, integrating privacy, natural light, and spatial expansion. The home’s multi-layered structure fosters an interplay between openness and enclosure, adapting flexibly to its surroundings. Carefully arranged volumes and walls create a dynamic sequence of spaces. The design embraces traditional Japanese elements, reinterpreted through contemporary architectural language to enhance urban living.
Project Duration: The project was completed in 2019 in Tachikawa, Tokyo, Japan.
Operation Flow: Smooth circulation and spatial layering create a dynamic living experience. The atrium channels natural light and air throughout the house, shifting in ambiance with time. Adjustable screens and staggered walls allow residents to control privacy and exposure. The courtyard functions as an outdoor extension of the living room, enhancing spatial fluidity. Black bamboo and illuminated surfaces establish a serene entryway, linking nature with contemporary design.
Patents: N/A
Team Members: N/A
Image Credits: Image #1, #2,#3, #4, #5: Photographer Nobuaki Miyashita, Variations, 2019