It says this represents a market share of 11%, the largest share it has ever had.
In the first half of 2011, HSBC lent £6.7bn in residential mortgages, 35% more than a year previously.
Martijn van der Heijden, head of lending at HSBC, says: “In 2011 we offered UK borrowers some of the most competitive rates around and we plan to continue this in 2012.
“While some estimates suggest mortgage lending in the UK will fall this year, HSBC has no intention of closing its doors to customers, nor will we compromise our reputation for responsible lending.
“Today’s announcement to make at least £15bn available to UK homeowners with £3bn explicitly for first-time buyers demonstrates HSBC’s commitment to continuing to help people move up or indeed take the first step onto the housing ladder.”