Sawmil Treehouse / Robbie Walker

Architects: Robbie Walker
Year: 2024
Photographs: Tasha Tylee
Category: Residential Architecture
Furniture Design: Robbie Walker
Engineer: Taylor Consulting Engineers
Locality: Sawmill Settlement
Country: Australia

Sawmil Treehouse residential project by Robbie Walker in Victoria, Australia demonstrates a compact and environmentally conscious design shaped by a client who prioritized setting and experience over real estate norms. Located at the edge of a gully surrounded by tall native trees, the home is elevated on four steel columns to avoid water flow and blend into the forest canopy. Slatted steel cladding references foliage, enhances ventilation, and prevents heat buildup, removing the need for air conditioning. The modest program includes a bedroom, bathroom, kitchen, and living space, with a garage, laundry, and outdoor kitchen below. BAL 40 compliance ensures all external materials are non-flammable. Interiors use sustainable timber and recyclable steel. The structure’s external slats create a ventilated gap between the steel surface and internal walls, reducing thermal gain. The client’s deliberate decision to build small affirms a commitment to environmental restraint and meaningful, sustainable living.

This project exemplifies how strong design can result from a client deeply engaged with the process. The brief was clear: “I want something small to share with my family and friends.” In the weeks leading up to the site visit, the client, Hollie, shared photographs of the trees on the property, identifying each one, rather than discussing finishes such as tile samples or kitchen benchtops. Her focus remained firmly on the qualities of the site and the intended atmosphere of the building.

The site sits at the origin of a gully where stormwater from the street is discharged. A single flat section near the boundary offers the only level ground, while the rest of the plot is densely populated with tall native trees. The decision was made to elevate the structure among the trees and away from the water flow. Drawing inspiration from the surrounding vegetation, the four supporting columns emulate tree trunks, and the slatted exterior is designed to catch light in a scattered, organic manner—similar to how foliage filters sunlight. These slats also promote ventilation and cooling by shielding the steel roofing and wall linings from direct summer sun. The building maintains a minimal footprint, containing one bedroom, a bathroom, a kitchen, and a living area—just enough to serve its purpose.

Elevating the building off the ground provides vehicle access beneath, where a garage utilizes the site’s flat portion. This garage includes a laundry area and a concealed outdoor kitchen. Due to the presence of large surrounding trees, the site is classified as a BAL 40 bushfire zone, requiring all external materials to be non-flammable.

Environmental efficiency in this project is rooted in the client’s values. While the interiors are made entirely of sustainably sourced timber and the remaining structure uses steel for its recyclability, the most significant decision was to build small despite having ample space. Real estate agents suggested that a larger house with four bedrooms and three bathrooms would have greater market value, and banks might struggle to appraise a modest one-bedroom home in a rural location. Moreover, smaller projects still require the same consultants, permits, and reports as larger ones, offering minimal cost savings. Despite these challenges, the client chose to limit material use and resist unnecessary expansion—not out of constraint, but as a deliberate and principled stance. In a system that favors excess, committing to build less underscores a deeper commitment to sustainability.

In response to the harsh Australian summer and BAL 40 bushfire zone regulations, the structure is enveloped in steel slats that shade all walls and the roof. These slats create a ventilated cavity between the external surface and the main structure, allowing air to circulate and effectively cool the building without the need for air conditioning. This passive strategy addresses both climatic and regulatory constraints through architectural detailing. The project stands on the traditional lands of the Taungurung and Gunaikurnai Peoples, whose enduring connection to the land is respectfully acknowledged as part of the broader context in which the building exists.

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Project Location

Address: Sawmill Settlement, 3723, Victoria, Australia

Location is for general reference and may represent a city or country, not necessarily a precise address.