The fixed rate mortgage is available at 2.49% and is available for loans up to 75% LTV.
Teachers also offer a discounted variable rate mortgage at 1.99% for the first two years. It then changes to the standard variable rate, currently 4.99%, for the remainder of the term.
James Bawa, chief executive of Teachers Building Society, said: "Our commitment to helping teachers and local residents move onto the property ladder includes ensuring our rates are as competitive as possible and meet the needs of our customers - whether they are looking for a lower rate variable deal or the set payment plan that a fixed rate provides."
