Platform has launched six 95% loan-to-value products include a 5-year fix at 3.49% with a £999 product fee.
There is also a 5-year fix at 3.74% with no fee, as well as 95% LTV mortgages fixed for 2 and 3 years.
The products have a maximum loan amount of £350,000, £500 cashback and a free standard valuation.
Paul Norcott, head of mortgages and insurance at The Co-operative Bank, said: “We’re pleased to be able to continue to support first-time buyers and those who are finding it difficult to save a bigger deposit to buy a home.
“At a time when there is renewed focus on the difficulties people in the UK are facing to get onto the property ladder we hope that our new mortgage range will be a welcome addition to the market and our broker partners will be able to find a suitable option for their clients who need higher LTV mortgage options.
“Our team will be on hand to work with our broker partners to deliver this new product to market and will be able to answer any questions and provide further details.”
Platform has also made some rate cuts, as its 75% LTV 2-year fix has been reduced by 0.10% and its 75% LTV 5-year fix has been cut by 0.05%.
Buy-to-let mortgages fixed for 2, 3 and 5 years have also seen reductions across the LTV spectrum.