The Yorkshire-based mutual will offer the deal on loans up to £250,000, and loan-to-value ratios of up to 65%.
The mortgage is offered with a £199 booking fee and completion fee of £1,800. There is also no higher lending charge and up to 10% capital repayments are allowed each year without penalty charges.
Phil Coombes, head of intermediary sales at Leeds Building Society, said: “This is an excellent offer that allows clients to guarantee low payments for two years and benefit from the peace of mind this delivers.
“Many borrowers want to control their outgoings, and we know that certainty at an affordable rate will be popular.”