A space designed for human health and well-being


Castellana 81 has initiated the WELL Building Standard certification process for Core & Shell and aims to be the first office building in Spain to obtain this standard. WELL is the first global certification for buildings focusing solely on human health and well-being and is based on seven years of scientific, medical and architectural research. WELL certification is an innovative system from the International WELL Building Institute™ (IWBI), set up in 2015.

WELL certification is an innovative system founded by Delos and managed by the International WELL Building Institute™ (IWBI), set up in 2015. It certifies that the design, construction and operation model of the building addresses health and well-being of persons. It evaluates on site the building’s impacts regarding seven concepts: air, water, light, nourishment, fitness, comfort and mind.


In order to obtain WELL certification, Castellana 81 will apply a series of measures, some of which have already been implemented:

Measures aimed at improving indoor quality:

  • Levels of radon gas in the air far from the values deemed to be hazardous for human health. Measurement performed by Arup and analysed in the Laboratory of Santiago de Compostela University.
  • Low presence of volatile substances, particles or inorganic gases. Measurement performed by Aire Limpio and Arup.
  • Supply of an outdoor air source that guarantees good indoor air quality, compliant with the global ASHRAE 62 and Spanish RITE standards
  • Filtering of outdoor air in the building via F7 filters in the HVAC system.
  • Promotion of healthy habits for occupants and smoke-free building.
  • Use of products with low volatile organic compound (VOC) content inside the building: paint, cladding, adhesives, sealants, furniture and insulation.
  • Good practices in renovation work performed on the building to improve indoor air quality.
  • Good practices in building maintenance to avoid the use of pesticides and other chemical products.

Measures aimed at improving lighting:

  • Artificial lighting systems with low or zero glare at work stations.
  • Access to natural light and direct outside views for 95% of occupants on office floors.

Measures aimed at improving mental well-being:

  • Promoting health and wellbeing awareness for building occupants, through a digital library accessible to occupants.

Measures aimed at improving nourishment:

  • Regular natural and whole food offer for occupants.
  • Healthy nutrition information through messages displayed on the big screen in the lobby.
  • New canteen for personnel in common areas, with outdoor air and fittings aligned to WELL standards.

Measures aimed at promoting fitness:

  • Outdoor spaces equipped with benches and other elements that promote activity and interaction among people.
  • Bicycle spaces in car park.
  • Showers and changing rooms provided for users.

Measures aimed at enhancing comfort:

  • Guaranteed accessibility for persons with disabilities, aligned with the Building Technical Code and 5-star DIGA accessibility certification.
  • Levels of outdoor noise in the building below dBA, complying with the local regulations and WELL certification. Measurement performed by Arquilav (Laboratory of the Polytechnic University of Madrid) and Arup.
  • HVAC system that provides the right levels of comfort to occupants, as verified by ASHRAE 55.

Measures aimed at improving water quality:

  • High quality drinking water at consumption points for users, complying with local regulations and WELL requirements. Measurements performed by Arup and analysed by the Labaqua laboratory.