Vantage will retain its location, staff and name but will look to accelerate growth with the help of the wider group.
The lender launched its second charge lending division in 2017.
Two thirds (66%) of the lender’s buy-to-let completions were for portfolio landlords.
The lender said the move is part of its transition into longer-term second charge mortgages.
Shawbrook’s prime second charge product has rates from 3.40% above base rate up to 95% loan-to-value for applicants up to the age of 80.
The Loan Partnership specialises in sourcing and arranging second-charge mortgages, plus commercial and bridging finance.
Shawbrook’s second charge mortgage range features loans up to 95% loan-to-value whilst Paragon’s go up to 85% LTV.
Learn from the Experts: Second Charge Mortgage Insights to Help You Make Informed Decisions is designed to educate brokers and IFAs about second charge products.
The move will allow Smart Money’s introducer partners to access West One’s second charge mortgage solutions.
Total lending grew by 29% to £1.9bn and included a 21% increase in buy-to-let mortgage lending, with buy-to-let completions reaching £1.4bn for the year.