Under the current guidelines (Environmental ProtectionDepartment & Electrical and Mechanical Services Department,2010), it is optional to report carbon emissions belonging to scope3. An example of this category is the laundry services in the hotels,which were provided by outsourced contractors beyond the physical boundary of the hotel buildings. In order to identify the amount and significance of carbon emissions from this kind of services and others such as outsourced operation and maintenance works (Lai,Yik, & Jones, 2008), the relevant data should be recorded.