The combined group, which includes both PMS and Sesame, advised on £14.9bn of mortgage applications in the first six months of 2013, a £3.2bn increase on the same period last year.
John Cupis, managing director of Mortgages, at SBG, said: “With the excellent support of our adviser and lender partners, SBG’s mortgage proposition goes from strength to strength.
“Our strategy is clear and on track to drive more from every mortgage sale, so that customers get great value products and services from PMS and Sesame advisers.
“Double-digit growth in the first half of this year demonstrates how the investments made in our new broader mortgage proposition are paying dividends.
“We have secured more exclusives and bolstered our protection and general insurance offerings in 2013.”
SBG’s new mortgage valuations, specialist lending and legal services are also attracting increasing levels of support from advisers and lenders with record growth in all areas.
Cupis added: “This is good news for SBG and for hard working advisers to enhance their service to customers.
“With a buoyant mortgage market and record numbers of mortgage advisers joining us last year, and into 2013, we are confident these encouraging mortgage results will continue into the second half of this year.”