Direct writer Churchill Insurance is opening a second claims unit, creating 120 new jobs, after taking over the lease of a former Commercial Union building in Ipswich.
The four-storey building will be renamed Churchill House.
The insurer has already recruited 76 staff who will start working in October.
Martin Long, chief executive, said: “Churchill is keen to strengthen its links with Ipswich, which started in July 1988 with the purchase of Anglia Countrywide.”