Cussons has been with the firm since 2011 and has accumulated a large portfolio of clients across the region.
He specialises in providing targeted business finance advice to clients of all sizes, in particular regarding those operating in the construction industry.
The group currently operates across Ipswich, Colchester, Cambridge and Diss – where Cussons will be spending most of his time.
He said: “I want to bring in more of our accountancy expertise alongside all that insurance knowledge, so we can offer a more rounded service to our clients in south Norfolk and north Suffolk.
Cussons is also part of the firm’s cloud-accounting services which helps clients move from traditional paper-based accounting to digital bookkeeping.
Jason Fayers, Scrutton Bland’s managing partner, added: “This appointment is very well deserved – our Business Advisory team has developed and grown in recent years and shows our commitment to growth in the region.”