You can usually work while you are claiming ESA if both of the following apply:
you work less than 16 hours a week
you do not earn more than £152 a week
You can do as many hours of voluntary work as you like.
Tell JobCentre Plus about your work including any volunteering when you make a claim.
If you’re already claiming ESA and want to start work, fill in the ESA permitted work form. Send the form to Jobcentre Plus.