The 2.49% 2-year fixed rate is available up to 60% loan to value with a 2.5% fee.
TMW is also making improvements of up to 0.7% with rates starting from 2.49% at 60% LTV, 2.89% at 75% LTV and 4.14% at 80% LTV.
The lender is also expanding its remortgage range with new products benefiting from free legals and valuations and rates starting from 3.59%.
All 3.5% arrangement fees on the standard buy-to-let range will be reduced to 2.5 per cent per cent.
Henry Jordan, managing director of The Mortgage Works, said: “TMW is now offering its lowest ever buy-to-let fixed rate, which is great news for both experienced and first-time landlords looking to maximise cash flow and for remortgage customers looking to better their standard variable rate.
“These changes further demonstrate our steadfast commitment to the buy-to-let sector, with landlords being able to secure market leading headline rates across all of our loan-to-value tiers up to 80%.”