The product is available at 3.97% up to 95% LTV and comes with a £495 arrangement fee.
Additional payments of up to 10% p.a. are allowed without penalty.
Anita Arch, Head of Mortgage Sales, said: “5-year fixes have become increasingly popular, as borrowers want to lock into today’s highly competitive rates before they start to rise once again.
The 5-year fix launched today not only offers first-time buyers an excellent rate, but also access to Saffron’s individual underwriting which is not dependant on credit scoring.”