The Platform: A Dismantlable Timber Dojo Raised Clear of the River's Flood Risk

Most dojos are built to stay put. The Platform is built to leave if it has to. Its strict timber grid, cedar beams and cross laminated timber walls are assembled as a kit of parts that can be dismantled and reconstructed elsewhere. That one decision changes how the rest of the building reads. Permanence gives way to readiness, and a single-purpose martial arts hall becomes a civic platform where culture, sport, food and public life share the same adaptable room.

Designed by Mathieu Mainoldi, the project was shortlisted in the Tokyo Dojo competition. Mainoldi places the building near a river and lifts it away from flood risk. The water is treated as a cultural and environmental presence to be framed, while the elevated platform keeps the main public spaces out of its reach. The outcome is a building that belongs to its site without being permanently bound to it.

Slanted Columns Hold the Edge Between Shelter and Landscape

The first view sits at the building's perimeter, where slanted timber columns and cantilevered beams carry a covered walkway in the manner of an engawa. A lone figure sits facing the lawn at dusk, and the frame shows how much work this threshold does. It is neither inside nor outside. It is a sheltered ledge from which to watch the landscape, and it reflects the project's wider stance toward the river: stay close, stay protected.

The angled supports matter beyond their looks. They show the structure plainly and set a rhythm that repeats around the building. Mainoldi does not cover the frame with finishes. The timber itself creates the atmosphere, and the edge is where visitors first understand that the building's character comes from its bones.

A Circular Arrival Hall Built Around Stone, Water and Light

The entrance hall is the project's most ceremonial move. It is a circular room organised around a central rock set in a reflective water basin, with a large circular skylight above and a curved balcony wrapping the upper level. Daylight falls straight onto the stone, and visitors gather beneath the balcony's edge. The sequence slows people down before they reach the more active parts of the programme.

Calm is only part of its role. The Japanese words for food, information and welcome appear across the interior and signal that this room is a public interface first and a dojo lobby second. From here visitors can pause, meet, ask for directions, head to the canteen or continue into the sports and cultural spaces. Here the reference to Japanese culture works through spatial order and material restraint, not borrowed rooflines.

One Timber Roof, Many Uses Beneath It

Two kendo practitioners face each other on the wooden floor, and the hall around them makes the case for flexibility. The timber roof spans tiered bleachers, tatami-like floor zones and open practice areas. Ceiling lines draw the eye across the room, and large openings bring daylight deep into the interior. The space feels generous and ordered, and it is not tied to a single sport.

This is the shift the brief asks for. The same room supports martial arts, public events, gatherings and performances, so the dojo works as a cultural room that also hosts training. Because the bleachers and floor zones are defined by the structural grid and not by fixed partitions, the hall can be reconfigured without changing its architecture.

An Exploded Assembly That Reads Like Instructions for Reuse

The exploded axonometric is the most important drawing in the set, because it shows the reversibility the project promises. The building separates into labelled layers: concrete base elements, wooden floors, cedar beams, cross laminated timber walls, suspended ceilings, bleachers, steel railings, sliding doors and roof panels. Each layer is legible on its own, which is exactly what a building meant to be dismantled requires.

Here sustainable timber architecture moves past material preference into a construction strategy. Repetition makes the parts efficient to produce. Clear layering makes them recoverable. Long-term adaptability is built into the assembly logic, not added later as an aspiration.

A Circle Set Against the Grid in Plan

The ground floor plan shows how the two geometries coexist. The circular entrance hall sits beside the rectangular dojo, with changing rooms and bleachers arranged along the strict structural grid. Outside, a terrace and an open playground grid carry the building's order into the landscape. The circle softens the rigour of the frame and gives the plan a clear social centre.

The plan also clarifies the programme's priorities. Arrival and gathering take the most distinctive form, while the athletic spaces follow the efficient repetition of the structure. It is a sensible hierarchy for a building that wants to serve as public infrastructure as much as a training facility.

Why This Project Matters

The Platform reframes the dojo around a question many public buildings now face: what happens when the site itself becomes uncertain? Mainoldi answers on two levels. The building is lifted away from flood risk, and its construction allows it to be taken apart and rebuilt somewhere else. Resilience here means both standing firm and being ready to move.

What makes the proposal persuasive is that this technical logic never overwhelms the experience of the building. The engawa edge, the skylit stone in the entrance hall and the warm, ordered hall all come from the same disciplined timber system. For anyone thinking about climate-sensitive civic architecture, the project offers a useful model: a low-impact structure that is legible, repeatable and generous enough to hold a community's culture, sport and everyday life.

View the Full Project

About the Designers

Designer: Mathieu Mainoldi

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Project credits: The Platform by Mathieu Mainoldi Tokyo Dojo (uni.xyz).