1.1.5 Periodic and suitable cleaning of windows

1.1.5 Periodic and suitable cleaning of windows


It is important to maintain the windows’ glass clean to allow a good penetration of natural light in the building and to improve their use, avoiding the use of artificial light.



  • It improves the internal light comfort

  • Reduce the use of lighting systems

  • Extend the life of windows


  • It may be difficult to clean the external glass in a building with high curtain wall, in which case a specific cleaning installation is necessary

Economic assessment

Low investment. It includes the cost of water, detergent and manpower. The cost could be more elevated in case the installation of a specific cleaning system is required (up to 20€ for each window pane). It reduces the costs associated to the use of artificial lighting.

References and best practices

  • How the windows of skyscrapers get washed: citylab

Image gallery


Environment or playable world:

  • Residential

  • Academic

  • Offices

  • All

Carried out by:

  • Public building users

  • Owners

  • Operators

  • All

Reduce consumption of:

  • Heating

  • Cooling

  • DHW

  • Lighting

  • Electric devices

Type of driver:

  • Physical environmental

  • Contextual

  • Psychological

  • Physiological

  • Social

Time framework:

  • Short term
  • Long term

Type of measure:

  • Envelope
  • HVAC
  • DHW
  • Lighting
  • Electrical devices
  • Other
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