Sustainability Report

This project makes use of a prefabricated engineered timber building system that prioritises sustainability throughout its design and construction stages. Several key low-carbon strategies have been integrated to minimise the project’s environmental impact.

• HasleTre is designed using Building Information Modelling (BIM), supporting the structure’s entire lifecycle, from design and construction to operation. BIM reduces waste and analyses energy efficiency and sustainability options.
• The prefabrication process significantly reduces offcuts and material waste. In addition, transportation requirements for wood are reduced by up to 80 percent compared to concrete elements, thereby minimising the associated carbon footprint.
• The external walls consist of prefabricated timber cassettes insulated with wood fibre, further reducing on-site construction waste as well as enhancing the building’s thermal performance.
• HasleTre’s energy needs are met by municipal waste combustion. Moreover, harnessing the hygrothermal properties of the building’s exposed timber reduces energy consumption.
• The building’s cross-laminated timber (CLT) and glued laminated timber (glulam) structure supports carbon sequestration, offsetting a significant portion of emissions during the construction process.

The project embraces innovative, sustainable materials and cutting-edge construction techniques, enhancing both environmental performance and building quality. Materials include:

• CLT (474 cubic meters)
• Glulam (108 cubic meters)
• Prefab timber walls
  Wood fibre insulation
• Exposed wood in interior
• Timber cladding
• Goat hair carpets
• Timber to timber connectors

The material palette creates a building that harmonises with its surroundings, utilising nature’s properties to enhance performance and establish a deeper connection between architecture, climate, and ecology.

• These innovations minimise environmental impact while fostering healthier, more adaptable, and more comfortable working environments.
• The building’s roof and certain sections of its walls are planted with pollinator-friendly species. This supports urban biodiversity by providing a habitat for bees, butterflies, and other beneficial insects.

Area-weighted average estimated energy use for office and retail/outward-facing areas: 

• Estimated net energy demand — 114 kWh/m2 gross floor area (108 kWh/m2 net floor area)
• Estimated delivered energy — 109 kWh/m2 gross floor area (104 kWh/m2 net floor area)

Average U-values (W/m²K)

• Exterior walls: 0.22 W/m²K
• Roof: 0.12 W/m²K
• Floor: 0.12 W/m²K
• Windows/doors and glazing: 0.73 W/m²K
• Normalised thermal bridge value: 0.03 W/m²K