The company, which has offices in London Bridge and Embankment, as well as other parts of Britain, has 22,000 staff in the UK.
The group’s offices have been open since July, with numbers of people returning increasing weekly.
Around half of the firm's employees have spent time back in the office since they reopened on July 6.
PwC's Ellis added: “There are aspects of our work, including audit, that require gathering of evidence and judgements that will, on occasions, require face to face discussion and on-site activities, to preserve decision making and quality. Now, more than ever, flexibility is critical in how we support our people and clients.”
