Fuller's said it had installed three new 300hl bright beer tanks, each of which holds around 52,000 pints.
Managing director John Roberts said: "We are doing very well in that sector and I think the future looks very good."
The extra capacity will also boost London-based Fuller's export business - it has recently started distributing its beers in Russia, China and Japan and is eyeing India.
The announcement came as part of Fuller's first half results, which saw sales in its beer business rise four per cent to £30.3 million for the six months ended Sept
29, with off-trade beer volumes growing 3 per cent to 17,300 barrels.
The event was the last results conference for Fuller's finance director Paul Clarke, who is to retire in April 2008 after 16 years with the brewer, during which, chairman Michael Turner said, the company had recorded "steady and consistent growth".