The intermediary deal, designed to help first-time buyers and home movers, will be available on a semi-exclusive basis through Legal & General, Openwork, LSL Group, Intrinsic, Positive Solutions and Brilliant Solutions.

The mortgage has a £499 completion fee, £195 non-refundable reservation fee and has an early repayment charge of 3% for the term. The maximum loan size is £250,000.

Steven Marks, intermediary services executive for Newcastle Building Society, said: “This new 90% LTV product reinforces our ongoing commitment to the first-time buyer market.

“We anticipate it should prove particularly attractive to advisors and their clients at a time when it is being reported that affordability for first-time buyers is at its best level for 12 years.”