Previously borrowers using this method of repayment were restricted to 50% LTV.
The part-and-part split cannot exceed 50% on interest only and borrowers must meet Barclays’ minimum income requirements.
Sole applicants must earn at least £75,000 and for joint applications borrowers must either earn £100,000 between them or one applicant must earn £75,000.
A spokesman for Barclays said: “Following a regular review of our lending criteria we have decided to broaden our policies to help more customers whether they are buying a home or remortgaging from another lender.”
Leeds Building Society launched its part-and-part range in May aimed at helping people who took out mortgages during the peak of their popularity who are now left with endowment shortfalls.