This is believed to be because lenders respond to changes in legislation and growing demand from landlords restructuring their operations.
Research from moneyfacts.co.uk discovered that there were 133 buy-to-let limited company products available 12 months ago. Today, there are now 313 available, representing 20% of the overall market .
One in five rental properties are now let by limited company landlords, according to research covering Q1 from Countrywide.

Source – http://www.mortgagesolutions.co.uk/news/2017/05/22/buy-let-product-numbers-limited-companies-doubled-12-months/?utm_source=Adestra&utm_medium=email&utm_term=&utm_content=%20Buy-to-let%20product%20numbers%20for%20limited%20companies%20doubled%20in%2012%20months%20&utm_campaign=Roundup%20Daily%20HouseAdvert2&utm_campaignid=216&utm_cmdid=74918

Company landlords take fifth of rental market, says Countrywide