As of September 2024, UK
building societies and their subsidiaries collectively held total assets amounting to approximately £525 billion. Their residential mortgage balances stood at over £395 billion, representing around 24% of the total outstanding
mortgage balances in the United Kingdom. In terms of savings, building societies held approximately £399 billion in
retail deposits, accounting for about 19% of all such deposits in the UK. They also managed £153.9 billion in
cash ISAs, around 40% of the total UK balance. The building society sector collectively employed around 52,300 full and part-time staff and operated through approximately 1,300 branches, making up around 30% of the UK's total bank and building society branch network. Among these institutions, the
Nationwide Building Society is the largest. As of April 2024, it reported total assets of £271.9 billion, employed approximately 17,680 people, and operated 605 branches across the United Kingdom — more than any other UK banking brand. == Members ==