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Project status



The demonstration building is a three-block residential building located in the Portugalete municipality in Greater Bilbao and is developed by the Basque Government’s Department of Housing, Public Works and Transport. The implemented technologies had to be energy-efficient in order to achieve the target value but at the same time low-cost, because the developer couldn’t afford expensive technology. The social scope of the project is also important as it is oriented towards social housing. Therefore, the building will be low-cost in order to be affordable for tenants of low-medium income.

Webinar: How to build cost-efficient low-energy buildings in northern Spain

Demo Site Expected Impact

*Information regarding the technical and financial performance will be available at a later stage.

This residential building serves for social housing oriented to low-income residents. It has been designed as a passive solar house with a targeted annual energy use of 42 kWh per m². The design of the building aimed to minimise its environmental impact by using materials with low embodied energy and low environmental toxicity wherever possible.


Buildings and energy

*Information regarding the technical and financial performance will be available at a later stage.

Several energy efficiency measures were implemented in the building:

Energy efficiency in buildings

  • Retrofitting the building envelope
    • Parietodynamic wall, integrated with the building ventilation system, to maximise the energy storage in the facade
    • An insulating painting with nanotechnology, which is designed to insulate and waterproof the walls
    • Green roofs, which provide insulation in winter and prevent overheating in summer


  • Building management system
    • An energy display screen was installed in each of the buildings, providing information on heating, lighting and electric energy consumption. This is a tool for communicating with the residents, making them aware of their energy consumption to help improve users’ behaviour.


José María Campos Domínguez
Tecnalia Research & Innovation

Building aspects

  • Building Energy Services
  • heating and DHW
  • Building Energy Services
  • lighting and appliances
  • Technology used to supply the buildings
  • condensing boiler
  • Technology used to supply the buildings
  • electrical equipment
  • Technology used to supply the buildings
  • heat pump: reversible
  • Technology used to supply the buildings
  • micro CHP

Thematic Field

  • New Building(s)

1 Residential building in Portugalete

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