Alternate Home: Halving Material Use with an Overlapping Module Strategy

What if the path to affordable housing runs not through cheaper materials but through smarter geometry? Alternate Home proposes an overlapping modular system where prefabricated residential units share structural elements with their neighbors, cutting material consumption by half. The result is a dense, chequered volume that looks almost like a three-dimensional puzzle, its staggered units creating pockets of daylight, ventilation, and communal life that conventional stacked-slab housing rarely achieves.

Designed by Yufeng Zheng, lcr1305, 晨冉 李, 晓雪 史, and 晓龙 张, the project earned runner-up distinction in the Plugin Housing Challenge 2020. The brief asked entrants to rethink plug-in housing for urban contexts where density, affordability, and adaptability must coexist. Alternate Home responds with a system designed to be reconfigured and reassigned over time, its modules moving between users as demographic and economic conditions shift.

A Perforated Roof and Open Communal Levels

From above, the building reads as a perforated canopy hovering over open communal floors that face a ground-level plaza punctuated by circular tree planters. The roof structure filters light down through the section, while the open levels below act as shared thresholds between the private units and the public ground. Step inside and the spatial logic becomes clearer: a central planted courtyard rises through an interior atrium, flanked by red and white staircases that link multiple residential levels. Residents move through this vertical garden on their way home, an arrangement that turns circulation into a social event rather than a utilitarian corridor.

Stacked Modules Organized Around Circulation Cores

The axonometric drawing reveals how the overlapping strategy works in plan and section. Residential units cluster around circulation cores anchored by the red staircases, while trees at balcony level soften the edges and mark the rhythm of the module grid. Each unit borrows a wall, a floor slab, or a column from its neighbor, which is the fundamental move that drives the 50 percent material reduction. The shared structure does double duty, simultaneously enclosing one unit and supporting the next.

At night, the chequered facade comes alive. The alternating pattern of occupied and void modules creates a glowing lattice against the darkened surrounding tower blocks, announcing a fundamentally different organizational logic. Where neighboring buildings present uniform curtain walls, Alternate Home's facade reads as an honest diagram of its internal structure: every lit window is a module, every dark recess is a shared void channeling air and daylight into the building's core.

Unit Typologies for One and Two Occupants

The isometric diagrams lay out the residential unit types available within the system, showing configurations for single-person and two-person occupancy complete with furniture layouts. Each unit is compact but deliberately planned: sleeping, working, cooking, and bathing zones are arranged to maximize usable floor area within the prefabricated module dimensions. The variety of typologies is crucial to the project's claim of adaptability. As tenants change, units can be reassigned to match new household sizes without structural modification, because the module boundaries, not the partition walls, define the building's framework.

Testing the Idea at Model Scale

The physical model strips the project to its essentials. Transparent walls expose the floor plates, the central circulation spine, and the chequered massing in a way that no rendering can. You can trace how each module interlocks with its neighbor, see where the shared structural members sit, and understand why the voids between units are not wasted space but active components of the environmental strategy. The model makes a persuasive case that this is not merely a graphic exercise but a buildable system with legible structural logic.

Why This Project Matters

Affordable housing competitions tend to attract two kinds of proposals: those that push radical form at the expense of feasibility, and those that optimize cost so aggressively they produce grim environments. Alternate Home lands in productive territory between these poles. Its overlapping module concept is a genuine structural innovation, not a stylistic choice, and the 50 percent material reduction it claims has direct implications for construction budgets in low-rent housing markets worldwide.

What elevates the project beyond a technical exercise is its attention to the quality of shared space. The central atrium, the planted courtyard, the open communal levels: these are the spaces that determine whether high-density housing feels like a community or a warehouse. By embedding social infrastructure into the same structural framework that drives cost savings, the design team demonstrates that affordability and livability are not competing priorities. They are, when the geometry is right, the same thing.

View the Full Project

About the Designers

Designers: Yufeng Zheng, lcr1305, 晨冉 李, 晓雪 史, 晓龙 张

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Project credits: Alternate Home by Yufeng Zheng, lcr1305, 晨冉 李, 晓雪 史, 晓龙 张 Plugin Housing Challenge 2020 (uni.xyz).