The market research firm said that it has seen year-on-year sales at the London office grow by 45% and is on course to double its revenue, compared to 2007.
Nunwood attributes this to the new business wins, but also to maintaining and growing existing clients including Tesco and InBev. Its multidisciplinary London team has subsequently doubled in size.
Sarah Houghton, Nunwood's London director, said: "2008 has started well for Nunwood and the increase in new business has resulted in a need for extra office space for our ever growing team.
"The expansion is great news for the team and indeed our clients because it now gives us the added impetus to grow further and add new marketing talent to our experienced and hard working team."
Nunwood has offices in London, Leeds and New York. It has been chosen as Marketing magazine's agency of the year three times in 2007, 2005 and 2004.