You can get a buy-to-let mortgage under the following circumstances:
You want to expand your property portfolio by investing in houses or flats
You have enough funds to take out a buy-to-let loan and understand the risks associated with investing in property
You already own your own property (either outright or by paying a mortgage)
You have a good credit record
You’re under a certain age (lenders have upper age limits, typically between 70 and 75)