Designed by Danish architecture studio Lendager, TRÆ rises 78 metres above Aarhus’ South Harbour and currently holds the title of Denmark’s tallest timber building. The mixed-use development combines office, hospitality and retail functions while showcasing how circular design strategies can work at an urban scale. The project highlights the potential of reused and biogenic materials in contemporary architecture without sacrificing performance or aesthetics.

Designing with Available Materials

The design team based the project on the principle of “form follows availability”. Instead of selecting new materials from the outset, the architects shaped the building around resources that were already available through reuse streams.

This strategy is most visible in the façade. Salvaged aluminium sheets cover the exterior and create a textured surface inspired by birch bark. The irregular colours, dents and imperfections remain visible, giving the building a distinctive identity that changes with the light and weather conditions.

Rather than hiding variation, the project celebrates it. The façade demonstrates how reclaimed materials can create visual richness and architectural character.

Timber Construction at Height

The name TRÆ carries three meanings in Danish: tree, timber and three. These references connect to the building’s material palette, environmental ambitions and three interconnected tower volumes.

Engineered timber forms the primary structural system. As a renewable material, timber stores carbon and helps reduce embodied emissions compared with conventional construction materials. The project also shows how timber can support high-rise construction in dense urban environments.

The three rounded towers maximise daylight access and create a softer silhouette along the waterfront. Their sculptural form responds to the compact site while strengthening the visual identity of Aarhus’ former industrial harbour.

Circularity Beyond Materials

TRÆ extends circular thinking beyond material selection. The development helps transform the former harbour into an active urban district with new public connections and social functions. An elevated pedestrian bridge links the building to Aarhus’ new highline, while a winding public walkway invites people into the site. Restaurants and public spaces activate the ground floor and strengthen the relationship between the building and the city.

The project also incorporates social sustainability initiatives. A local social enterprise operates one of the restaurants, and community programmes involve vulnerable groups in maintaining parts of the development.

A New Direction for Large-Scale Architecture

TRÆ presents a strong example of how large-scale architecture can combine reused materials, timber construction and social engagement within a single project. The building transforms waste streams into architectural value while reducing environmental impact at scale.

For architects and designers, the project offers a practical example of how circular construction can move from experimental concepts to mainstream urban development.

Source: Lendager
Photos: Rasmus Hjortshoj / Lendager