Rates include a 5.64% deal at up to 85% LTV with no fee, and a product at 4.89% up to 80% LTV.
There is also a 3.69% deal at up to 75% LTV and a 3.44% deal at up to 70% LTV.
All products that offer a maximum LTV of between 70% LTV and 80% LTV have an application fee of £855.
The deals come with a free valuation and legal fees for remortgages.
Platform has also increased the number of selected intermediary partners that can access the product from five to 10.
The products are available to appointed representatives of Legal & General Partnership Services, Openwork, Personal Touch Financial Services, Sesame, Pink Home Loans, Connells, London & Country, Ocean Finance Central Trust and Countrywide.
Lee Gladwell, director of business development at Platform, says: “The response from brokers since we launched as a mainstream mortgage provider has been encouraging and we believe that we are making progress in our aim of helping intermediaries provide good service to their clients.”