The lender did so by taking the number of mortgage broker firms it works with to 152, adding Simply Money, Uniform Mortgages and Goldberg Steele most recently.
The bank had begun the year with 83 broker firms affiliated to work with it and access its mortgage products.
HSBC said during the year it had also introduced processes to reduce the time to offer to less than 10 days on average across all channels.
HSBC UK head of intermediary mortgages Chris Pearson (pictured) said it had been a “landmark year” for the lender and he was extremely proud of the team for delivering on every front.
“We have almost doubled the number of broker firms who have access to our products in the last 12 months while streamlining our processes to bring down our time to offer,” he said.
Pearson said it had also focused on slashing response times for brokers.
“We will continue to work hard to simplify our processes where there is friction and help brokers in supporting their clients with speedy turnaround times, giving them both peace of mind,” he added.
Last month it opened up further advances and a live chat facility to brokers, while chief executive Ian Stewart said HSBC was looking to potentially double its UK mortgage lending.