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Elevated Living Above Active Railways With Mixed-Use Spaces

Authors:
Walter Hjaltested, Caterina Decker
Elevated Living Above Active Railways With Mixed-Use Spaces

Project in-detail

Located above active railway viaducts, the design transforms underutilized infrastructure into a dynamic mixed-use environment with diverse housing options and integrated community spaces.
5 key facts about this project
01
Located above active railway tracks, enhancing urban use of infrastructure.
02
Design includes circular public squares encouraging social interaction.
03
Mixed-use floors accommodate both residential and community facilities.
04
Potential for over 250,000 new homes without requiring additional land.
05
Varied apartment typologies cater to a wide demographic range.

The City in the Sky project makes use of the Greenwich Railway Tracks in London, addressing the city's high demand for housing while enhancing community connections. The design combines residential and commercial spaces in a multi-level urban structure that seeks to foster interaction and accessibility among residents.

Design Concept

The architectural layout reimagines the railway viaducts, which have primarily functioned as storage and maintenance areas, turning them into a lively mixed-use environment. Comprised of a two-story, low-rise structure, the project spans about 5 kilometers, creating a continuous living area that features streets elevated above the ground. This approach aims to connect individual living and working needs with broader community experiences.

Programmatic Elements

Mixed-use floors within the City in the Sky include both living units and community facilities such as kindergartens and workspace offices. This design provides vital services for residents and serves as a sound-insulating buffer between the apartments and active train operations below. By integrating various activities within the same space, the environment promotes a vibrant atmosphere where daily life and work can coexist.

Community Interaction

Pedestrian paths and public squares are woven throughout the design, facilitating movement and fostering social connections among residents. Circular public spaces feature restaurants and cafes, encouraging community engagement and enhancing urban life. These areas contribute to a livelier atmosphere, breaking down the usual barriers often found in city designs.

Housing Capacity

The plan can accommodate over 250,000 new homes without needing to acquire additional land, presenting a sustainable approach to urban development. By offering diverse apartment types, from affordable units to more premium residences, the project meets the varying needs of a dense population. This inclusivity is essential in addressing the ongoing housing crisis in the city.

The City in the Sky concludes with communal spaces that encourage exploration and connection, framed by an inviting streetscape that serves as a gathering point for residents.

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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

Enter an open architecture
competition now

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