Sun Bank's mortgage book has leapt by 50 per cent last year, bringing total to over £1.5bn.
The firm puts the growth down to the success of its flexible niche loans which includes self-cert mortgages, buy to let and a tailored mortgage package called Complex Prime.
Sun Bank says it is preparing itself for an even busier 12 months now that it has completed its move to new headquarters in Bournemouth.
The firm was bought by Portman Building Society for £95m in September 2001. Portman is in the process of acquiring Staffordshire Building Society.
Portman Group intermediary sales associate director Paul Howard says: “This has been a busy but extremely successful 12 months and our results are the icing on the cake. The move to Bournemouth has allowed Sun Bank to boost its processing capability and put even better customer service teams in place. I am certain that this will provide Sun Bank with a platform for further growth over the coming year.”