ARCA House: A Sustainable, Modular Home in Brazil’s Atlantic Rainforest
Set within the lush Atlantic rainforest of Brazil, the ARCA House by Atelier Marko Brajovic offers a striking example of contemporary design that respects its environment. The residence combines a distinctive dome-like silhouette with an efficient, low-impact approach to construction and materials. Built from a specialist alloy known as Galvalume — a blend of carbon steel and aluminum with a zinc coating — the shell resists humid tropical conditions while keeping both construction and assembly costs manageable.
The ARCA House follows a modular strategy that allows rapid on-site assembly: a complete unit can be erected on a prepared lot in as little as a week. The Galvalume exterior is combined with a lightweight steel framework and wooden planking to create a comfortable family home that balances durability and warmth. Because components are prefabricated and modular, the house can be disassembled and relocated or reassembled elsewhere, and its parts can be reused in future builds — a pragmatic approach that reduces material waste and supports long-term affordability.
Raised on an elevated platform to minimize ground disturbance, the ARCA House occupies its site lightly, conserving the surrounding vegetation and adapting to uneven terrain. The clustered, curved modules provide structural strength and a compact thermal envelope that complements passive strategies for comfort in a rainforest climate. Large expanses of glazing and thoughtfully placed windows invite daylight deep into the interior and frame views of the surrounding forest and waterfalls.
Inside, the layout favors openness and flexibility. The main living area is an adaptable space that works as a social hub for family life and can double as a workshop or event area when needed. A compact, efficient kitchen supports everyday life while preserving sightlines, and intimate private rooms provide comfort and privacy without excessive square footage. Wooden interior walls and doors delineate spaces with a warm, tactile finish that contrasts the metal shell.
A long balcony wraps sections of the house, providing outdoor living space and direct connections to the rainforest canopy. The balcony and elevated stance make the most of views and breezes, reducing reliance on mechanical cooling. Surrounding landscape features — including nearby streams and small waterfalls — enhance the serene setting and reinforce the house’s relationship to place.
Practical assembly and material efficiency are central to the ARCA concept. Prefabricated wood, metal, and glass elements can be fabricated off-site and assembled quickly; depending on the scope, the frame and shell can be completed within a few weeks. When the house reaches the end of its useful life on one site, its modular components allow for recycling or reconfiguration, minimizing landfill contributions and extending the useful life of building materials.
The result is a residence that pairs modern aesthetics with practical, ecologically minded choices — compact, resilient, and responsive to its rainforest setting. Large glazed walls, curved windows and simple, minimal bedroom spaces emphasize comfort and connection to nature while maintaining a restrained material palette that supports longevity and maintenance.
By combining modular construction, a durable Galvalume shell, and a compact, adaptable plan, ARCA demonstrates how contemporary architecture can coexist with fragile ecosystems. It exemplifies sustainable design principles that reduce site impact, encourage reuse, and celebrate simple, functional beauty within a rainforest landscape. (Photography: Victor Affaro.)
