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The purpose of this paper is identification of a methodology to determine CO₂ emissions through facility services on an approximate and sufficiently accurate basis. This methodology is to be used by German practitioners for request for proposals (RFPs) and offers of facility services.

In accordance with ISO 14067, a matrix of CO₂-relevant modules for the representation of CO₂ emissions from facility services is developed. Key figures for energy consumption, transport and equipment manufacture and use are used in a case study.

For a transparent CO₂ assessment of facility services, the following modules are required: work clothing, devices, vehicles (service personnel), supplies, transportation of personnel and overhead (vehicles and office space). In the case study, facility services account for about 30 per cent of the CO₂ emissions originating from the use of the building.

The methodology developed is also applicable to other services. Prior to that, however, the investigation of additional facility services (catering or security) and an extension to other types of facilities is required (office building, hospital, etc.).

The developed methodology allows transparent competition for low-carbon services concepts, for example, in RFP procedures for facility services.

CO₂-optimised facility services increase the demand for low-emission operating equipment and resources. They therefore have an indirect influence on the development of a low-carbon economy.

To date, there has not been a methodology that supports a transparent and practical summary of the service-related CO₂ emissions associated with the resources used in facility services.