Available from today, the new mortgages will give borrowers greater choice and will include a base rate tracker, two, three and five year fixed rate deals.
Post Office head of Lending, Az Alibhai said: "Homebuyers across the UK can now take advantage of the Post Office's range of competitive mortgages, available through our unrivalled branch network, online and by phone. We offer a choice of different products to meet different borrowing needs and all customers can benefit from our low fixed arrangement fee.
"What's more, as our revert rate is currently the best in the market and tied to the base rate, customers on fixed rate deals won't be in for any nasty surprises once their initial rate period ends and can expect good long term value.
"We have extended the accessibility of our mortgages meaning that in over 250 larger Post Office branches, customers will be able to discuss their borrowing needs with a dedicated member of the branch team. Customers can also arrange a call-back from a dedicated mortgage specialist from our contact centre via their local Post Office branch."
A range of buy to let products will continue to be available.