The partnership will allow members of the Buckinghamshire to access fee-assisted remortgage products.
Huw Lewis, sales and marketing director for LMS, said: “We are delighted to announce that we will be providing services for Buckinghamshire Building Society and its members.
“The Buckinghamshire is committed to offering clients the highest possible level of service while also offering attractive products and we look forward to working with it. We are also pleased to be expanding further into the building society sector.”
Kate Büggs, head of customer services at Buckinghamshire Building Society, said: “LMS is highly commended in its field and consistently delivers excellent service along with market-leading risk mitigation strategies. Its knowledge and expertise makes it an ideal partner for us and I am delighted to begin our working relationship.”