Its analysis showed that the number of buy-to-let mortgages available has increased from 237 in October 2008 to 483 today, with 86% now available through intermediaries only or brokers and providers, compared to 70% in 2008.
Over the last three years, the proportion of broker-only buy-to-let deals has increased from 24% of all deals to 60%.
In addition, Defaqto’s research showed that the number of buy-to-let lenders has increased from 56 to 63.
Of these, 15 operate through intermediaries, 18 distribute directly and the remaining 30 lenders servicing both channels.
David Black, Defaqto’s insight analyst for banking, said: “Our analysis indicates that intermediaries are becoming ever more important within the sector, with the number of brokered products increasing rapidly since 2008.
“The key challenge for brokers is how to convert these opportunities for the benefit of their business.
“Essentially, they need to play to their core strength, which is giving advice, and this is particularly important in the buy-to-let sector where people are likely to need more guidance when selecting a suitable mortgage.”
Meanwhile, Defaqto’s analysis also found that 62% of buy-to-let insurance policies are available through intermediaries.