The lender has also cut its 2-year discount rates, 3-year and 5-year fixed rates and its buy-to-let reversion rates, which results in a more generous rental calculation for many borrowers according to Aldermore.
It has also increased its maximum portfolio size to five properties and £2m.
Charles Haresnape, managing director of residential mortgages at Aldermore, said: “We’re very comfortable with the way our buy-to-let portfolio is performing and feel the time is now right to strengthen our range.
“These enhancements to both criteria and rates will ensure Aldermore’s residential buy-to-let products are amongst the most competitive available and I have no doubt they will be popular with both brokers and their clients.
“Intermediaries can also be assured they will receive Aldermore’s consistently high quality award-winning service, provided by experienced staff who are always happy to discuss cases with brokers.”