Aldermore has raised the maximum LTV to 80% on its range of residential buy-to-let fixed rate mortgages.
The specialist lender has also cut its two-year discount rates, as well as its three and five-year fixed rates.
Buy-to-let reversion rates have also been reduced by 0.5 percentage points.
The maximum portfolio size has been increased to five properties and £2 million.
Meanwhile, the maximum age is now 85 years at the end of the mortgage term.
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.