As part of the agreement, members of the mortgage club will now have access to the lender’s range of residential, buy-to-let, holiday let and regulated family buy-to-let products.
The society considers unusual properties, shared ownership, lending into retirement and interest-only with property downsizing as an exit strategy.
It also offers a family assist mortgage where no deposit is required, which will all now be available to members of the club.
Melanie Spencer, head of MCI Mortgage Club, said: “The addition of Mansfield Building Society to our panel brings even more choice to our members.
“Brokers have access to forward looking lenders and our advanced technology, which makes life easier for them so they can service their clients efficiently and effectively.”
Paul Lewis, national development manager at Mansfield Building Society, added: “We assess and agree mortgages based on individual circumstances rather than rely on the use of automated credit scoring systems.
“We will consider more unusual situations, we listen to what people want and we help them whether they are after their dream home or a property investment.”