The lender is making the change as it prepares a relaunch of its direct to customer offering.
All current Saffron mortgages will remain available, including those that have previously only been available to brokers, to any applicant in England and Wales.
The move is a planned operational strategy to make way for the launch of a new, customer-focused service that is due to launch in the first half of this year, the lender said.
Although this is not in direct response to the current coronavirus situation, this move will allow the building society to focus on those customers most in need of their help.
Saffron Building Society head of mortgage sales Anita Arch said: “We are on the verge of launching something very special and extremely exciting at Saffron this year, which is the focus of a lot of our attention.
“In preparation, we have made the decision to suspend direct-to-customer mortgage sales this spring to allow us the opportunity to get the new service ready to launch. Any existing application will be completed – we are working with our applicants to ensure that we support them through the process.
“At the moment, our top priority is assisting our current customers, working with our partner brokers all over the country and ensuring we deliver the best possible experience to customers.”
Saffron said it is offering one-to- one support for mortgage customers and is dealing with enquiries for payment support at exceptionally high levels.