The bespoke service will offer professional advice and guidance to the club's brokers, with a particular focus on TCF and T&C.
Members can choose from all manner of support with varying intensity, depending on the needs of their individual businesses.
EQI will be overseeing the migration of the majority of its customer base over to membership of Mosaic, swelling the club’s membership number to over 1,200.
Tony Smith, chairman of the Mosaic Mortgage Club, said: “We want to do everything possible to make the challenging job of operating in the regulated DA mortgage market, at this difficult time, easier and less stressful, wherever possible.
"EQI have the credentials to deliver a robust compliance service at an affordable price and we believe that is exactly what our members want.”