Freeman joined the firm in 2004 on its graduate training programme and later became a residential surveyor in 2006.
Her most recent position within CSS was as technical director where she supported lender clients, customers, field and central colleagues.
In addition, Freeman has also been involved with RICS as part of its diversity and inclusion campaign.
As part of her new role, Freeman will be expected to utilise her career development to encourage and promote further opportunities within the business.
Matthew Cumber, managing director of Countrywide Surveying Services, said: “Rebecca really is a shining example of what hard work, enthusiasm and talent really can achieve and we are immensely proud of her progression though the ranks.
“She has held a number of different positions within the company and excelled at them all – whether out in the field, managing claims or working closely with lender clients.
“As a company, we are a strong advocate of the Women In Surveying initiative, Rebecca has been a great flagbearer for this campaign and long may it continue.”
Freeman added: “Having worked within the business for nearly 17 years in a variety of roles, I am excited to be able to combine all of this experience into shaping the future of our business.
“I also hope my journey gives confidence and encouragement to all those seeking to further develop their career ambitions because my journey is proof that with the right support this is absolutely possible.”