Anglian Home Improvements has moved its £7m digital media account into Mindshare from Latitude.
The move, which was made without a pitch, means Mindshare will now be responsible for a consolidated Anglian account having already held its offline business since 2011.
Its work will now include search, affiliates and digital display advertising.
Anglian marketing director Martin Troughton said: "It was a natural step for us to increase the scope of work between the two businesses as we are confident that Mindshare can deliver even more value.”