The Boundary House: A Lightweight Steel Structure with the Warmth of Wood

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The light gauged section (LGS) lipped channel is known for being lightweight, easy to transport, and simple to work with. Leveraging these characteristics, Niji Architects designed the "Boundary House" in Tokyo, Japan — a residential project that reimagines steel construction with the familiarity of traditional wooden building techniques.

In a controlled factory setting, steel channels were precisely cut, perforated, and fitted with custom joint hardware tailored to each connection point. Once the foundation was ready, the prefabricated components were assembled on-site using only nuts and bolts. This straightforward approach, combined with the material’s light weight, allowed a single builder to handle components with ease and sped up the overall construction process.

The lightweight nature of the structure also eliminated the need for foundation piles, which significantly reduced building costs. The floors, walls, and roof were constructed using rigid panels strong enough to allow direct fastening, removing the need for additional support backing. Exposed steel elements inside the house contribute to a distinctive, industrial aesthetic.

To meet the homeowner’s needs, additional features like an eave and a balcony were added, seamlessly integrated using the same nut-and-bolt method. Though residential, the home stands out from its surroundings, reflecting the owner's individuality and sense of style.

With vacant lots on either side and the future of adjacent developments uncertain, Niji Architects prioritized privacy in the design. Windows were strategically placed at upper and lower levels to maintain a sense of openness while preserving intimacy. This thoughtful layout creates a serene rhythm in the living spaces and ensures quiet, private bedrooms.