The number of complaints about mortgage businesses, including brokers, rose 76 per cent in the second half of 2011 to 52,746, up from 29,917 in the first half of the year.
The FSA’s latest complaints data, published today, shows 47 per cent of complaints, or 25,687, were upheld in favour of the consumer, compared to 45 per cent in the previous half of the year.
In total, mortgage firms paid out £44.4m in redress in the second half of the year, compared with £22.2m in the first half of the year.
Mortgages businesses are made up of home finance administrators, brokers and lenders.
The most common cause for complaint was related to the advising, selling and arranging of products,
Meanwhile, complaints about home finance products, which include equity release, impaired credit mortgages, and other regulated and non-regulated mortgages, stayed static at 69,088, compared to 67,537 in the first half of the year.
Santander UK received the most complaints relating to home finance products with 10,874, closely followed by Bank of Scotland with 10,034.
Other lenders with a large number of complaints include Barclays Bank, HSBC, Northern Rock (Asset Management), NatWest and Nationwide Building Society.