The changes to LTVs include an extension from 80% to 85% for STB-1 products, and from 75% to 80% for STB-2 and STB-3 products.
Secure Trust is also amending its two-year fixed rate at 80%, from 3.19% to 3.09%.
Secure Trust Bank targets customers overlooked by high street lenders, including contract workers, the self-employed and those with complex incomes or those who have experienced a credit blip.
Tony Hall (pictured), head of sales and marketing at Secure Trust Bank Mortgages, said: “We are constantly monitoring the market so that we can continue to evolve our residential mortgage product range and ensure that we offer first rate products. The latest product enhancements will further increase the number of people we are able to help and put us in a more competitive position.”