There were 25 second charge mortgage repossessions in Q3.
Alongside Richard Deacon, Rob Barnard will be responsible for the sales division at Masthaven.
The value of second charge new business saw a year-on-year increase of 18%.
Bath Building Society offers niche offerings such as their 'Rent a Room' product.
There were 2,343 new second charge agreements in August.
A £60,000 facility was secured with Precise mortgages.
The SmartrRefer panel officially launched to advisers on 30 September.
The Cardiff-based business was established in 2013.
The Competition and Markets Authority (CMA) cleared the acquisition in July.
Self-employed borrowers and those with CCJs and defaults will be considered for the mortgages.