Here are some tools you can use to measure the impact of your work on the wellbeing of the people involved with your organisation. Remember to take your baseline data before you begin work with the person.
These websites contain useful instruction on how to use ICECAP O and Warwick Edinburgh measures:
Attachment Size 
De Jong Gierveld Lonliness Scale.pdf68.85 KB HEALTH SERVICE USE.pdf35.93 KB ICECAP-O questionnaire.pdf20.08 KB ONS subjective wellbeing scale.pdf30.64 KB 
Silver Dreams Core Indicators.docx22.66 KB The Warwick Edinburgh Scale.pdf84.96 KB Warwick Edinburgh guide.pdf1.23 MB